The petrol lawn mower will not start The petrol lawn mower will not start. Why?
The petrol lawn mower will not start. Why?
The lawn mower won’t start
If at the first start, your new lawn mower refuses to start, try the following: based on the air temperature outside, set the appropriate air damper position (at temperatures less than 30 C, the damper is closed, over 30 C half-closed position), then pump fuel into the carburetor and carefully, but pull the starter handle rather sharply until you feel some resistance. Repeat these steps in the same sequence several times. A brand new instrument must start. If this finally happened, you can safely start working by opening the damper completely beforehand.
If the mower is no longer new, then it is necessary to start its inspection from the gas tank. If the device has not been in operation for a long time, then it is necessary to drain off the old gasoline, which has a peculiarity of running out, i.E. Lose its octane properties, and refill with fresh fuel mixture. The gasoline / fuel ratio, as well as the required grades, are usually indicated in the operating instructions for the tool.
Now you need to check the spark plug, either the problem is in itself, or in the fuel system. The candle must be carefully unscrewed and its condition evaluated. If the candle is heavily flooded or there is black carbon on it, then it must be removed, cleaned and dried. Drain the excess fuel, if any, from the spark plug holes, drain the cylinder itself, then screw in the dried or, even more desirable, a completely new plug. If the plug was completely dry initially, you need to look for a problem in the fuel supply system. Check the fuel filter first. To do this, disconnect the suction hose and remove the dirty filter from it, clean it and reinstall it, or replace it with a new one. If this does not help, you should contact the service center specialists.
Will not start after winter
In this case, you just need to drain the old and, possibly, even frozen fuel and fill in the freshly prepared mixture. Then you need to perform the same manipulations as during the first start of the lawn mower.
The lawn mower will not start on a cold
When starting a cold engine, it is not recommended to press the gas. Tilting the mower so that the air filter is on top, press the fuel suction button 5-6 times, set the function switch lever to the start position, pull the starter cord several times until the engine starts. After a few seconds of running the motor, turn off the starting system.
The lawn mower won’t start after winter
In such cases, the unit must be serviced. Remove the fuel system, including filters (air, fuel), disassemble the carburetor, clean and rinse each unit. Blow out the filters with air. Pay attention to fuel quality and octane number.
It should be borne in mind that products of such well-known companies as STIHL, Husgvarna and other brands will not run on cheap gasoline with a low octane number.
Suitable fuel for them is from the AI 92 brand and above from car refueling stations and then from well-recommended ones, since there is also bad gasoline at refueling stations. The use of high-octane and high-quality gasoline will determine how long the lawn mower will be used and how long it will last.
It is necessary to take into account one more fact that with a long storage of a diluted fuel mixture, its working qualities fall, which also leads to consequences in which the lawn mower does not start. Therefore, it should be diluted in portions, that is, the amount of the mixture that is produced at a time.
The operating instructions clearly describe and explain the mixing ratio of gasoline and oil. Strict adherence to the correct proportions will at least save you from several questions about why the lawn mower won’t start and what to do in such cases.
The lawn mower starts and stalls. What to do?
1. There is a spark, and everything seems to be normal, but the mower will not start, in such cases you should check the air inlet valve to the fuel tank. A clogged valve leads to the creation of a vacuum in the tank, in which the carburetor does not receive enough gasoline, so the lawn mower will start, but then stall. To exclude this reason, you need to clean the valve and try to start the lawn mower with the tank cap not completely twisted.
2. If this does not start the mower, remove and clean the fuel filter and check all carburetor parts, then try starting. The lawn mower will not start again, the air filter is disconnected, try to start without it, if the mower starts up, the reason is in the air filter, replace it.
Checking the fuel mixture
Before starting the engine of the gasoline streamer, check the presence and quality of the fuel mixture. Do not save, do not be greedy and do not be clever in this matter. Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Prepare the oil-fuel mixture strictly according to the instructions. Calculate its amount based on real needs. Excess gasoline left over after work loses its quality over time.
Why the lawn mower won’t start troubleshooting
Caring for a personal plot, summer residents periodically encounter the fact that the lawn mower does not start. There are many reasons for tool failure. For the correct diagnosis of the problem, the owner of a useful unit in the country needs to know the device and the principle of operation of its individual parts.
- How to start diagnosing lawn mowers
- Checking the fuel mixture
- We carry out diagnostics of a candle and a candle channel
- Lawn mowers filter diagnostics
- Breather and exhaust port
- complex reasons for lawn mowers failure
- Rules for the operation and storage of lawn mowers
complex reasons for lawn mowers failure
If the step-by-step troubleshooting algorithm does not work, and your scythe still does not start or stalls, it is worth inspecting the carburetor and the engine itself. A clogged carburetor can be one of the reasons for erratic tool performance. There are three main problems here:
- Clogged ducts or nozzles. All this is cleaned by special washes or blown by a powerful jet of compressed air from the compressor. Do not use needles and wires, as the bore may be damaged;
- Worn carburetor gasket. Exit replacement of a failed gasket;
- Violation of tightness. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change everything is fine, but if the pressure starts to drop, then some part of the carburetor is faulty. We’ll have to find it and replace it with a new one.
If everything is in order with the carburetor, then the petrol trimmer may not start due to wear of the piston group. If chips, scratches or scuffs are found, the piston or cylinder should be replaced. Piston rings are subject to mandatory checks. A small backlash of the piston when rocking the connecting rod indicates that it is time to change the rings. It is best to entrust this procedure to the specialists of the service center.
2. Huter GLM-5.0 S
This model performs ideally on relatively flat surface areas. The device is powered by a single-cylinder, four-stroke air-cooled engine with manual start. The maximum power of the model is 5 hp. The two main levers, responsible for acceleration and braking, are placed on the handle, made in the form of an arc. It has height adjustment, if necessary, it can be removed completely.
The lawn mower is equipped with four plastic wheels with polymer treads, which will not harm the lawn grass. The model is fully self-propelled, rear-wheel drive. The user only needs to set the required direction. The cutting width is 46 cm, and the body is designed in such a way that the cut is larger than the width of the wheel axle. This makes it easy to handle areas adjacent to a fence, house wall or tree. As with previous models, the cutting height ranges from 25 to 75 mm. The cut grass goes into the collection box. All the main elements are very conveniently located, so it is very convenient to get to them in case they need maintenance or repair. The engine is equipped with a durable air filter, which reduces the toxicity of exhaust gases, making the equipment safe for the environment.
- The engine starts very easily;
- A full gas tank will be enough for a 1000 sq. M. Lawn. M;
- High maneuverability.
- The oil filler neck is not very convenient.
3. Champion LM4630
Another self-propelled model with a fairly reasonable cost. It is designed to care for a medium-sized lawn no more than 16 acres. The design is quite reliable, durable and easy to use. The model is equipped with a four-stroke engine with high environmental performance, engine power is 4.1 hp. The cutting width of 46 cm is ideally matched to the power of the motor, which allows you to cut grass at high speed. The central system for adjusting the level of the cutting height is represented by one lever, the range is from 25 to 75 mm. The knife is made of high strength material. It does not become dull and does not wear out for a long time. Accordingly, it does not have to be changed often. The blade consists of two specially shaped blades that will also pump air, creating good suction force. Thanks to this constructive solution, not only cut grass, but also leaves and even small twigs will be sent to the grass catcher.
The volume of the grass catcher is 60 liters, it is made of high quality fabric-type materials, the upper part is plastic, equipped with a very comfortable handle. The maximum speed of the lawn mower is 3.5 km / h, which is quite a good figure for a 173 cc engine. See The gas tank is designed for one liter of gasoline. The design is quite heavy with an empty gas tank and an empty grass catcher, it will weigh about 34 kg.
- Decent power
- Long service life;
- Low fuel consumption;
- Self-propelled.
- Significant vibration;
- The handle is finished with polyurethane foam, which wears out rather quickly.
What to do if the petrol lawn mower won’t start?
The most important point when using any equipment is to comply with the basic rules of operation and its timely maintenance. This approach will ensure that your petrol lawn mower is working properly and for a long time. Still, sometimes unforeseen situations happen, and the device for some reason does not want to start. In our article we will tell you about the possible causes and solutions to this problem.
Faults that you can correct yourself
When your petrol lawnmower will not start, the first step is to check that there is fuel in the tank. If it is missing. Top up to the desired level. Often, when the device is not used for a long time, gasoline runs out, so it must be completely drained and refilled with new. This procedure must be done carefully so that fuel does not get onto the engine, as this can lead to ignition in the future (when the engine heats up). Which gasoline is better to use, you can find out from the technical passport of the device.
In order for the unit to start, you need to pump fuel with a primer (if available in this model) into the carburetor and set the maximum speed. You need to start the technique carefully. The starter cord must be smoothly pulled out until it stops, and then pull it towards you with one even sharp movement.
A problem can occur if the air damper is not correctly positioned during the first start. Depending on the air temperature, it is completely closed or set to the middle position (above 30 C). Then it must be fully opened.
Check the air filter for dirt. To do this, turn off the machine and disconnect the wire from the spark plug. Unscrew the cover and remove the filter. Wash it with gasoline and dry it thoroughly, or just put a new one. Remember that it is recommended to change the air filter after every 25 hours of operation.
Another reason your petrol lawnmower won’t start could be a faulty spark plug. Perhaps she was just flooded with fuel. In this case, unscrew it, clean it and check for a spark. It may not be present when the spark plug is filled with fuel. Place choke control handle (if equipped) in the CLOSED position and start the engine. If this does not help, it is better to seek help from a specialist.
Try to constantly inspect the underside of the unit, as any damage to it may cause the engine to stall.
If your petrol lawn mower started up normally but stopped working almost immediately, it is likely that the crankshaft or piston is stuck. Another reason may be insufficient oil in the crankcase. We recommend manually moving these parts and checking the oil level with a special dipstick, you may be able to correct this problem.
However, remember that the replacement and repair of all faulty components and elements should be entrusted to professionals from authorized service centers. Never do it yourself.
If you want to talk with a specialist and get advice on the issue that has arisen, call us by phone: 7 (495) 135-29-39 every day from 10.00 to 20.00. We will provide all the information you need.