How to convert a lawnmower into a boat motor

Boat motor from a trimmer for grass: step-by-step instructions for redesigning

Almost every fisherman has a rubber inflatable boat at home. And of course, everyone would like this type of transport to be as fast, convenient and comfortable as possible. If in addition to the inflatable boat you have a lawn mower in the economy, you can construct a homemade boat motor on the basis of the trimmer for grass. Such a device is made fairly quickly and easily, and its performance and reliability will be enough to move the boat for long distances. Step by step about the construction of a boat motor from a brushcutter, we will tell you further.

When converting a motor, it is worth considering that they were designed to perform different functions. The grass trimmer functions at high revolutions and low torque, while the boat motor should do the opposite. Therefore, remaking the device requires special tools and even a drawing.

Engine from a trimmer for grass to construct more convenient and easier, since it has a number of necessary component mechanisms:

  • A very economical engine;
  • A built-in unpainted fuel tank that allows you to easily control the amount of fuel;
  • the presence in the device of the starter and gas;
  • Boom, equipped with a rigid shaft.

It remains only to buy the missing parts or make them yourself and you can proceed to making an engine for the boat.

Motor from a grass trimmer on the floor

Grass trimmer functions at high revolutions and low torque, and the boat motor should do the opposite

What you can do

There are several possible options for refining the grass trimmer under the motor for the swimmer.

Take as a rule, on every fishing trip, the first thing to start

A very simple method, but requires additional financial costs.

It will be necessary to purchase such parts:

  • A clamp for attaching the device to the transom of the boat.
  • Propeller. You can buy a ready-made kit online, since stores may not have such products. The package includes a special drive, made of stainless steel, as well as universal adapters for the flexible shaft of the trimmer for the grass, which allows not to bother with the fact that they will fit your model of lawnmower or not.

Advice! Sometimes the kit can include a clamp, so before you buy it, clarify what is included in the kit.

The drawing of the attachment to the trimmer is shown in the instructions. Installation will take about half an hour.

For conversion you will need an angle reducer from an angle grinder, a screw, which can be cut from a sheet of stainless steel, as well as gaskets and bearings for the fasteners. This method allows you to get the maximum revolutions, despite the small pitch of the screw. In the field, the device requires additional adjustment, which is done with a pair of pliers.

This method is performed as much as possible with your own hands. Let’s consider it in more detail on the example of a lawnmower with a two-stroke motor with a volume of 25 cm3. The device weighs 4.5 kg and has a power of 700 W and is equipped with a bent leg. A grass trimmer with this power allows you to move the boat at about 5-7 km/h.

For the conversion you will need an angle gearbox from an angle grinder, a propeller, which can be cut from a sheet of stainless steel, as well as oil seals and bearings for the fasteners

What’s needed

To make it will require materials, as well as tools:

  • grass trimmer.
  • Duralumin with a thickness of 2 mm. It is needed for the propeller.
  • Clamp or any other device for fixing the device to the boat.
  • Welding machine.
  • Fasteners.
  • Additional tools for the job.

All of the necessary elements can be purchased or made by yourself. You may need a blueprint for designing a homemade propeller, but not for the drive. The size of the propeller depends directly on the power of the drive, as well as the weight of the swimmer. For example, a propeller with dimensions of 10×3 cm can move a vehicle weighing about 120 kg.

Instructions for making

To make a boat engine from an ordinary grass trimmer you will need to do the following steps:

    Never throw away or lose the nuts, because the developer companies use their own type of thread, which is not metric or inch

Redo a bent shaft. To do this, remove the original nut, which is located in the spool with a fishing line. It looks like a small tube that is 2 cm long and has internal threads. It can be divided into two complete nuts. Tip! Never throw away or lose the nuts, as the companies developers use their own type of thread, which is not metric or inch. Next, you must remove the plastic overlay, which is located on the gas button. At the end of the bent rod there are no roller bearings, instead there is an ordinary sleeve made of bronze, also known as a plain bearing, it must be removed. You will need to carefully cut it out by first unscrewing the nut and removing the metal and stern shaft from the tube. Once the bronze sleeve is free, the flexible shaft tread, which is made of plastic, can be knocked out. Tip! The steel pipe can be thrown away, as it cannot be aligned. Instead, we use a duralumin pipe with the appropriate diameter. We mount the bronze bushing into the duralumin pipe and press it carefully along the chamfer with a hammer. Then we take a plastic protector, trim it a little in diameter and mount it tightly in the tube. Tip! When the outer diameter of the tube is larger and does not fit into the mounting hole on the motor head, you will need to turn it down to the right size. If necessary, you can build a longer shaft using a tube of desired length, and installing a steel rod instead of a flexible shaft of desired length.

Improvement of the grass trimmer by means of a ready-made set of nozzles

The choice of the gasoline trimmer for grass as a fundamental device for the boat motor, not inferior by its technical characteristics to serially produced models such as “Kentavr ML-5241RD” and others, due to the presence of a number of nodes that do not require modification. Among them:

  • economical internal combustion engine;
  • A rod equipped with a rigid shaft;
  • Motor starting mechanism (starter);
  • An unpainted fuel tank, so that you can visually check the amount of fuel mixture.

Choosing a trimmer for grass to turn it into a motor on the boat, you should determine its capacity. For example, for a small rubber watercraft “Ufimka-22” is suitable trimmer for grass with a capacity of 0.7-1.0 kW. Floating craft, equipped with such a unit, will be able to develop a speed of the order of 5-8 km / h. If you need to set in motion a heavier boat, you need a trimmer for grass more powerful.

As a side note! Choosing the power of brushcutter according to the weight and dimensions of the available boat, it is necessary to take into account the mass of the mounted engine itself.

You can turn a grass trimmer into a boat motor in different ways. For example, you can buy a set of ready-made parts required for modification and use the enclosed guide. With its help within a short time (no more than 1 hour) you can turn brush cutter into a boat engine.

The nozzles for converting a grass trimmer into a boat motor include parts like this:

  • propeller;
  • special drive attachment, which is made of stainless steel
  • a set of adapters and attachments for different types of trimmers (universal);
  • a control handle (tiller) equipped with a muffler button and throttle control knob;
  • clamp for attaching the grass trimmer to the transom of the watercraft, etc.

, but the engine itself is not part of it.

Important! Mounting the components of the kit on the grass trimmer, the owner will need to connect the gas control cable to the motor, and then attach the muffler cable, turning it in the direction of the propeller.

Advantages of using a grass trimmer

Using the grass trimmer to create a boat motor has several advantages:

  • Much cheaper than an off-the-shelf boat motor;
  • minimum fuel consumption;
  • low weight;
  • reliability;
  • tightness of design;
  • availability of ready-to-use control elements;
  • Built-in tank, etc.д.

Because of these qualities, the grass trimmer ranks first among other possible options for remodeling.

Principle of operation

Grass trimmer has a higher speed of rotation of the blades, which makes it possible to move through the water at a higher speed, which will allow you to start fishing faster than with a motor. Everyone has seen how the grass trimmer works. how it mows the lawn and regular grass, but here, its blades are twisted in the other direction and at the same time, it performs the function of the most economical motor.

But if the grass trimmer is lower, the speed will be lower. But the most important disadvantage of trimmers compared with ordinary boat motors is that they are very loud, and you should not use them at full volume, if you do not want to scare the fish.

Making a motor from an electric screwdriver

Good homemade motors for boats are obtained on the basis of cordless screwdrivers. Optimal looks the use of the device, which has a battery voltage of 12V. To such an electric motor it will be possible to connect a car battery with a capacity of 45-55 Ah. The rework will consist of several steps.

Lifting mechanism

The propeller of the electric motor for a boat, made by your own hands, must move not only in the horizontal plane, but have a certain immersion limit and lift completely out of the water. The simplest design would be a clamping system to which the motor is mounted. It is rigidly attached to the transom with a steel frame and a plate. The clamps are equipped with rings, through which the tube will pass. Inside will be a shaft of steel wire or rod. Appropriately sized bearings are pressed inside the tube for easy sliding.

Gear and propeller

The electric screwdriver is capable of generating high speeds, which are required for drilling. Homemade electric motor for the boat does not need such high revolutions, so to reduce them a reducer is installed. The most suitable option is to attach the gearbox from an angle grinder. In the chuck of an electric screwdriver is enough to clamp the upper part of the shaft to ensure a secure connection.

The role of a propeller can be a propeller from a car pump or computer cooler. But such an electric motor, made by your own hands, will not be able to provide the necessary speed to the boat. You can make a propeller out of a piece of stainless steel 2.5-3.0 mm thick.

  • To begin with, you need to cut a square workpiece measuring 30×30 cm.
  • In the center is marked a square with a side length of 5 cm. Diagonal lines are drawn through the corners. It will be cut to a small square.
  • Each petal should be rounded and rotated along the axis by 30 degrees.
  • In the central part a hole is made for attaching to the gearbox.
  • It remains to connect everything securely and test the resulting boat electric motor with your own hands.

Lawnmower modification

The outboard motor from a grass trimmer requires slight modification to get a working “horse” for the watercraft. The advantage of gasoline trimmers is their low price and maintainability. Homemade motors for boats on the basis of the lawnmower have a built-in tank, shaft and gearbox. You can look for a special conversion kit, which will have a propeller and stainless steel drive, as well as a set of adapters to the shaft of the trimmer for grass. Often there are kits with a clamp for mounting on the transom, so there will be no problems with the attachment to the watercraft. If to act according to the enclosed instruction, the boat motor from a lawn-mower can be built within 20-30 minutes.

skills will be needed from the fisherman, if he decided to radically change the design of the trimmer for grass. In this case there is a huge room for imagination and ingenuity. One of the options is to make a vertical leg.

  • To turn the shaft 90 degrees with respect to the engine, you will need a gearbox from an angle grinder.
  • If you have a grass trimmer tube, it needs to be shortened with a pipe cutter. It is best to replace the inside of the hub with bearings.

Tip! To fix the bearings inside the tube, carefully press around the circumference with a hammer.

  • A simple screw can be made from a 10×30 cm duraly strip 2 mm thick. Having attached the stencil with a two-bladed propeller to the workpiece, it is necessary to make a marking. Use an angle grinder and chisel to cut the propeller. Edges need to be filed. Putting the plate on a flat surface, bend both blades to a height of 1 cm.

Advice! You can make any necessary adjustments in the course of the test. At low speeds, the blade is trimmed or the pitch of the propeller is changed.

  • Drill a hole in the center for the connection to the shaft. To prevent the blade from snagging the watercraft’s cylinder during rotation, it is better to make a circular nozzle. The boat motor on the basis of the trimmer for grass is ready, you can go to the pond.

Ready to assemble a set of nozzles

Now they sell special attachments for remaking grass trimmer into a boat motor. This attachment includes everything you need to attach it to the gasoline trimmer motor. The control handle and the on/off button are mounted on the boom. The gas handle is made with the possibility of switching speeds and is equipped with a ratchet that fixes the desired position.

The kit includes a mounting fixture for mounting the unit on the boat. The attachment to the grass trimmer can be assembled easily, it has a simple design. To reassemble, attach the throttle cable to the motor, and then secure the muffler cable. The attachment costs about 5 thousand rubles in a specialized store. rubles.

Blitz Tips

You can make a homemade boat motor from a grass trimmer. First you should prepare the materials and tools:

  • 3 l grass trimmer.с.;
  • A sheet of 2mm thick steel for the screw;
  • welding machine;
  • fasteners;
  • a clamp to mount the engine to the side of the boat;
  • angle grinder;
  • Drill.

Before the work, you need to create drawings with all the dimensions, necessary parts and assemblies for the work, as well as the scheme and order of installation.

Figure out the size of the propeller, which depends on the power and weight of the boat with the load. You must take into account that a propeller with dimensions 3×10 cm, mounted on the engine, can carry a boat with passengers with a total weight of up to 120 kg.

Stages of work to make a motor from a gasoline mower:

  • To make a motor for the boat, you must first redo the bent shaft.
  • Then make a screw.
  • Replace the plastic engine cover with a switch.
  • Attach the shaft to the engine from the mower.

Redesigning the curved shaft

First you need to redo the bent shaft. To do this, you need to take a 2 cm high cylinder shaped nut with a slit inside. Unscrewed nuts and bolts must be saved, because they have non-standard threads. Then redo the rod with the rigid shaft. Pull the flexible shaft out of the rod by removing the nut.

The end of the rod has no bearings, they are replaced by a sleeve, so it must be cut out. Remove the tread. Since the metal pipe is bent, it is difficult to level it, so it will not be used. It should be replaced by a dural tube of the same diameter or smaller than the bushing.

A bronze sleeve is placed in the tube. To do this, bore the pipe slightly. Then gently press the bushing into the groove with a hammer. It is not advisable to force the bushing so that it does not become damaged. The tread is cut to the desired diameter and placed in the rod. If the tube has a large diameter and it is difficult to put it in the hole of the head of the engine, you should grind it to the required size.

Instead of a flexible shaft, take a steel rod and connect it to the motor shaft. Then screw the screw on the shaft and secure it with the nut. Then you need to fix the rod with the inner shaft to the motor using adapters. These must be made in a lathe. Different models of mowers may have some peculiarities that must be taken into account.

Using the gearbox from an angle grinder

The gearbox from an angle grinder is often used to build a haymower-based boat motor. It needs to be modified. Replace the shaft and the pinion with a longer one, which will fit the rod. The end of the shaft is made similar to the extracted short shaft so that the same bearings can be applied.

At the bearing locations, mount a gasket that will protect the bevel gear from water. The gear housing is twisted with sealant. Pour grease into the gearbox to cover the gears.

Making screws

To create the screw you need a strip of duralumin 100 mm long and 30 mm wide. If you put the propeller on the table, there should be 10 mm from the propeller to the blade. Adjust the angle of the propeller blades with the pliers. Before that, you need to anneal the dural. You can make propellers with 2 or 3 blades of different sizes. Propeller dimensions must be selected individually.

Ready set of nozzles

There are now lawnmower attachments that can be retrofitted with little effort to convert your mower into a boat motor.

The attachment already has a solution for attaching it to the gasoline engine of your grass trimmer.

Also attached to the boom is a control handle with a muffler button. The throttle grip is bicycle-like (a gearshift bike) and has a ratchet that locks the selected position.

This kit even includes a special clamp designed to secure the entire structure to the boat (on the transom of the boat).

The nozzle on the grass trimmer is collected without difficulty, as its design is very simple. It remains only:

If you read the reviews on the Internet about this device, they are mostly positive.

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Methods of making a boat engine from a brushcutter by yourself

The easiest way to make a motor for a watercraft is to use a brushcutter with a straight leg (rod) and, accordingly, a rigid shaft. In this case, all completion comes down to the production of a propeller, which can be cut from a strip of stainless steel or duralumin. The size of the workpiece. 100x30x2 mm. Blades should be given a curved shape, for which they need to bend about 10 mm. Screw edges need to be sharpened. An example of a simple propeller drawing is shown on the picture below.

Important! Size, number of blades and angle of bend are chosen individually, based on the weight and size parameters of the boat and grass trimmer engine power.

The produced propeller is installed in place of the trimmer head. In this case it is desirable to use a ring attachment, which will not allow the propeller to damage the boat. In more detail, the process of refining the trimmer for grass with their own hands is shown on

Revision of the gearbox of the angle grinder

To achieve the maximum engine speed, you can equip the trimmer for grass angular gearbox from the angle grinder, which first need to finalize. At the same time you may need oil seals and bearings. The process of finalizing gearbox consists in replacing the original short shaft for a longer one, corresponding to the size of the trimmer rod for grass. However, in order to do this, you will have to disassemble the gearbox.

Important! Shape and mounting dimensions of the new shaft must match the parameters of the node removed from the gearbox. This, in turn, will allow to use the bearings and pinion available in the gearbox.

After making a new shaft, reassemble the gearbox, previously protecting the bearing with an oil seal that prevents the penetration of water. In addition, it is recommended to apply thick grease to the existing gears or fill the inner cavity of the housing with it. To seal the casing rubber seal and / or sealant is used.

On a side note! Increase revolutions of the trimmer engine by means of a gearbox and attach the propeller to the output shaft of the latter.

Grass trimmer modifications with a curved boom

If the owner of the boat has a lawnmower, the boom of which is bent, the latter must be dismantled and replaced by a straight tube of appropriate diameter, made of duralumin. If the diameter of the new tube will be larger than the size of the hole in the motor block, the landing place will need to be turned down to the right size. To rework the boat, proceed as follows. drawing).

  • First unscrew the standard nut 2, which is located in the bobbin with cord. It is strongly recommended that you do not discard the fasteners removed from the boom, since brushcutter manufacturers often use their own types of threaded connections that do not match the standard ones.
  • Then unscrew the original nut 4 and remove the stern tube. 8) and flexible (pos.9) shafts.
  • Then cut out position 6. friction bearing (has a bronze sleeve at the end of the shaft).
  • Then knock out from the rod plastic tread 10.
  • Then the previously removed plain bearing 6 is pressed into a straight pipe 7. It may be necessary to bore out the tube for this.
  • Then the plain bearing 6 is carefully pressed with a hammer on the groove 5. Here it is important not to damage the pressed bronze sleeve.
  • Then the plastic protector 10 is trimmed to fit and firmly pressed into the pipe 7.
  • Then the stern shaft is connected to the steel bar that will replace the flexible shaft 9. The help of a turner is needed for this.
  • The final step is to attach the propeller 3 to the stern shaft 8 using the nut 2.

The assembled boom is connected to the motor with the help of specially made adapters, the shape and size of which depend on the design features of a particular model of trimmer for grass.

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Boat motor from grass trimmer: step-by-step instructions for redesigning

Almost every fisherman has a rubber inflatable boat at home. And of course, everyone would like this type of transport would be the fastest, most comfortable and convenient. If in addition to the inflatable boat you have a lawn mower, you can construct a homemade boat motor on the basis of the trimmer for grass. Such a device is made quite easily and quickly, and its performance and reliability will be quite enough to move the boat for long distances. We will tell you step by step about the construction of a boat motor from a trimmer.

Using a grass trimmer as a boat motor has a number of significant advantages and benefits.

The benefits of such a technical solution:

  • low cost: the grass trimmer is much cheaper than a professional boat motor;
  • Low fuel consumption with sufficient performance;
  • reliable and tight construction, taking into account the individual nuances of use;
  • small size and weight of the tool, which is also very practical and convenient for use on light boats;
  • control of fuel thanks to the transparent walls of the tank;
  • rigid shaft inside the boom.

Motor power must be at least 0.7 kW. Ready-made attachments for conversion (attachment for attaching to the engine, a special adjustable handle with a silencer button, mounts) can be purchased. After installing them on the grass trimmer will only need to connect the throttle cable to the engine and connect the wires to the muffler.

How to make a boat motor with your own hands from a grass trimmer?

To create a boat motor from a lawnmower, a tool with a straight boom is suitable. If the grass trimmer boom is curved. you will have to work on its improvement.

The rework is carried out according to the following algorithm:

  • First remove the nut (marked 2 in the diagram below). Do not throw it away or lose it, because it is impossible to replace the factory parts with ordinary nuts.
  • Unscrew the remaining parts and take the deadwood and the flexible shaft out of the boom (figures 8 and 9 in the drawing).
  • Use a new duralumin rod with slightly smaller inside diameter. Carefully place the bronze sleeve (in the drawing) into the sleeve.
  • Cut the tread (part 0) to the required size and insert it into the boom.
  • If the outside diameter of the shaft is too large for the motorized hole, turn it over.
  • Use the factory nut to fasten the screw.
  • The shaft is fastened to the motor by means of adapters. There are no universal drawings for this part, because different trimmer models have their own design features. You can have this part made in a lathe or make it yourself from plywood. The construction will be fastened by means of 4 screws.

If there is no possibility to buy a ready-made set for modification, which was mentioned earlier, you can take a handle from a sports bike to adjust the handle.

The propeller can also be made independently from a piece of duralumin, using the drawing below:

The pitch is the distance from the blade to a horizontal surface. Tilt angle is adjusted with a pair of pliers. To do this, the workpiece is preheated.

To refuel the motor from the grass trimmer on the boat, use only high-quality fuel and lubricants. Dilute gasoline with oil in the appropriate proportion. For the first 10 kilometers do not expose the engine to high loads. it will be the break-in period. Depending on the power of the engine, a boat with such a motor can reach a speed of 5 to 8 km / h.

Below is a video, which demonstrates the work of such a unit:

How to make a boat motor with your own hands from a trimmer for grass?

To build a boat motor from a lawnmower, a tool with a straight rod will do. If the grass trimmer boom is curved, you have to work on its improvement.

The modification is carried out according to this algorithm:

    First remove the original nut (marked 2 in the drawing below). Do not throw it away or lose it, since it is impossible to replace the factory parts with ordinary nuts.

If there is no possibility to buy a ready-to-use conversion kit, which was mentioned earlier, the adjustment handle can be taken from a sport bike handle.

You can also make a screw yourself from a piece of duralumin, using the drawing below:

The pitch is the distance from the blade to the horizontal surface. Adjust the angle with the pliers. For this, preheat the workpiece.

Use only high-quality fuel and lubricants to fuel the motor from the grass trimmer to the boat. Dilute petrol and oil in the respective ratio. The first 10 kilometers do not expose the engine to high loads. this will be the break-in period. Depending on the motor power, the boat with such a motor can reach a speed of 5 to 8 km/h.

Below is a video that demonstrates the work of such a unit:

Making a mount to install the motor on the boat

To install a homemade boat motor from a lawnmower, you can use a ready-made clamp. But if you have an old hand grinder in the garage it won’t be hard to make a motor mount to mount it to the transom:

  • Using an angle grinder, cut out the bottom of the grinder and drill a hole with a diameter of 12 mm in the cross plane of the housing.
  • Flatten one end of the rod with a diameter of 12 mm and a length of 100 mm and drill a hole with a diameter of 6 mm in the resulting plane.
  • Insert a bolt with a suitable cross-sectional area into the hole. The ring of the grass trimmer will be put on it, which was originally designed for attaching the belt.
  • The homemade mount can now be connected to the boat transom with a stud and a nut. Install the motor and secure it with the appropriate nut.

Making an engine mount for mounting the engine on the boat

You can install the homemade lawnmower motor with the help of a ready-made clamp. But if you have an old meat grinder in the garage, it shouldn’t be too difficult to make an engine mount to mount it to the transom:

  • Use an angle grinder to cut out the bottom of the trimmer and drill a 12 mm diameter hole in the transverse plane of the housing.
  • At a pin with diameter of section of 12 mm and length 100 mm to flatten one end and drill in a plane with diameter 6 mm.
  • Insert the bolt with the suitable cross-section diameter in the obtained hole. The grass trimmer ring will be put on it, originally intended for the belt attachment.
  • Now you can connect the kit to the boat transom with a stud and a nut. Install the motor and fix it with the appropriate nut.

How to make a boat motor with your own hands from a grass trimmer?

To assemble a motor from a grass trimmer for a boat, the maker will need to prepare the following equipment and materials:

  • household lawn trimmer;
  • clamp. If it is not available, you can use any other attachment to securely fix the motor to the boat;
  • a sheet of duralumin, which thickness should not be less than 2 mm;
  • welding machine;
  • a set of fasteners;
  • a set of screwdrivers and a wrench.

To assemble a homemade propeller, the maker will need drawings. They must specify the exact dimensions of the blades and the way they are fixed on the axle.

It should be remembered that the lower the power of the used drive and the weight of the boat, the smaller should be the blades. For example, for a boat with a maximum weight of 120 kg, a propeller with 10×3 cm blades is sufficient.

After preparing equipment and careful study of drawings, you can begin assembling self-made.

The work algorithm should look as follows:

  • First of all, the manufacturer will need to refine the bent shaft. First you need to remove the factory nut placed in the spool with the pre-coiled fishing line. The nut itself is shaped like a small 2 cm tube with an internal thread. If necessary, it can be divided into 2 small complete nuts. You must be extremely careful not to lose the fasteners during removal. If this happens, you will not be able to find another suitable fastener;
  • After removing the nut, you will need to remove the plastic overlay located on the gas button. There are no roller bearings on the end of the original bent rod. They are replaced by an ordinary bronze sleeve, which is often referred to as a plain bearing. It must be carefully removed. Before doing so, it will be necessary to unscrew the nut, and remove the deadwood and metal shafts from the tube;
  • Then you need to proceed to knock out the plastic protector, located on the flexible shaft. In the future, you can throw the steel tube, as you can not align it by improvised means. It can be replaced with a duralumin tube of the same diameter. You will need to install a bronze sleeve in it, which will need to be moved along the canvas with a hammer. Then you need to take the pre-cut diameter of a plastic protector and install it on the tube;
  • The next step is to produce the propeller. For this you need to cut duralumin blades and sharpen their edges. After that, each blade needs to be bent upwards by 1 cm, so that the propeller pitch is at least 10 cm. Fix the finished device can be fixed with the help of a nut;
  • Next, you need to install a bicycle gear shifter on the boat motor from the brushcutter, which will replace the regular plastic overlay. It will then be necessary to install a muffler that will divert engine exhaust away from the boat driver;
  • To secure the boat motor from the lawn trimmer, you will need to use two sheets of plywood. After that it remains to clamp the shaft, using 4 screws for this purpose. While transporting the boat motor from the grass trimmer, the shaft can be removed.

After the homemade nozzle is ready, you will need to run it in. To do this, you need to prepare a fuel mixture of fresh gasoline and motor oil in a ratio of 40:1. After that it is required to pour the ready mix into a regular tank of the boat engine, start it, and let it produce 1 full tank of fuel at idle speed. After running-in, the homemade boat motor from a grass trimmer will be fully ready to work.