How to adjust the idle speed on your power tiller

RPM adjustment of a power tiller

The fuel system is an inseparable part of an internal combustion engine. The main component in it, responsible for maintaining the nominal performance of the engine is the carburetor. It doses the mixture of gasoline and air to the engine. During the service revision of the entire fuel system is carried out: change the filters, check the level of contamination of the fine gasoline purification elements, but the carburetor adjustment, on which the revolutions of the motoblock depend, is at the head.

adjust, idle, speed, your, power, tiller

How to adjust the idle speed on a Subaru

Nominal power and stable operation of the gasoline engine at the plant depends largely on the original quality of the filling in the motoblock, namely the ratio of fuel to air in the engine cylinder. The carburetor of the agricultural machine is responsible for enriching the fuel with the intake air in the right proportion. Keeping it working all the time guarantees a high torque, durable engine with low emissions.

Your power tiller carburetor

The rated power and stable operation of the factory gasoline engine depends largely on the initial quality of the fuel filled into the single-axle tractor, namely the ratio of fuel to air in the cylinder of the internal combustion engine. The carburetor of a farming machine is responsible for enriching the fuel with the intake air in the desired proportion. Keeping it running smoothly and continuously guarantees a strong torque, long life, and low exhaust emissions.

Adjusting the K-60 carburetor

K-60, a carburetor for power tiller Cascade is similar to the device and principle of operation of other models.

Adjustment is also similar to the adjustment algorithm of similar devices:

  • free the float chamber from the residual gasoline;
  • open the air inlet connection of the unit;
  • Install the throttle valve in 2 millimeters from the air duct;
  • then tighten the fuel control screws to the stop;
  • Turn the screws by ½ turn;
  • Start the engine and warm it up for 3-5 minutes;
  • unscrew the screws to the lowest number of revolutions of the motoblock motor;
  • After completing this operation, the adjustment screws are screwed in again.

Peculiarities of adjustment of carburetor “Lifan

Adjustment of carburetors in “Lifan” motor blocks, as well as in any other types of equipment has its own characteristics. It is in demand in those cases, when it is required to return the unit working capacity or to adjust it correctly. It is the carburetor that often causes other malfunctions in the whole motoblock. If it can be repaired. good. Otherwise you will need “Lifan” engine parts of all series.

The principle of adjusting the carburetor for all models is practically the same. A distinctive feature can be the number of revolutions. If there are any signs of failure, you should look closely at this unit and adjust the carburetor for better performance. If you do not know how to adjust the carburetor, this article will be very useful.

The structure and adjustment of the carburetor K-45

The single-axle tractor Neva MB-1 and MB-2 models are equipped with the DM-1K engine with a K-45 carburetor. There are also modifications of the model, such as K-45R, K-45U, K-45M.

For proper adjustment, let’s briefly consider its structure.

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The carburetor is an engine node that overflows fuel, mixing it with air, and regulates its flow into the cylinders.

Let’s look at the scheme of the K-45. Here the throttle lever 11 is located at the bottom of the flap, which regulates the amount of mixture of gasoline and air. The regulator rod is attached to it. At the top of the throttle is the stop screw 5. The main flap lever 14 controls its position. In the closed position, it is held by a spring, and when the engine starts, there is an opening at a certain angle. angle is calculated so that there is no excessive fuel mixture enrichment of the cold engine of the power tiller.

Adjustment of the K-45 allows the entire power system and the engine itself to work without interruptions:

  • Prepare the carburetor for adjustment and warm up the motor of the motoblock;
  • reduce engine rpm with the help of screw 5;
  • using the screw 8 to set the maximum number of revolutions at idle engine speed;
  • and finally change the speed by turning the screw in the opposite direction by 0.25 turn.

K-45 repair: basic recommendations, video

In order to repair the carburetor with your own hands, we suggest reading the video repair of the motor-block “Neva” MB-2.

  • If an excessive amount of air enters the engine chamber. Try to replace the gasket between the head and the carburettor and tighten the mounting nuts on the connection. If this does not help, the cause may be wear on the shaft on the choke or the hole where it is connected. Such a shaft must be replaced, and if the holes are broken, the entire unit must be replaced.
  • When too much fuel is getting into the float chamber. In this case check and replace worn parts: float, nipples, needle.
  • If the carburettor is not getting enough gas, check the filter and sump, the fuel hoses and the gas tank. Contaminated elements should be washed or replaced, and if the tank is corroded from the inside, you will have to clean it with caustic soda.
  • If you see an increase in fuel flow, adjust the carburetor by referring to the owner’s manual.

Replace with a different carburetor

In order for the carburetor of your power tiller to work properly and without interruptions, you must constantly monitor the condition of the filters, make adjustments for the proper supply of fuel and air, and use gasoline with an octane number not lower than 92. In case the breakdown of the K-45 could not be avoided:

  • Buy the original unit;
  • Remove the faulty mechanism, starting with the head of the engine;
  • drain fuel residue from the faulty carburetor;
  • clean the joint and replace the unit.

Or go to the service department for a replacement. If you want to put a carburetor of another brand on the unit, buy the necessary adapter.

Adjusting the centrifugal regulator and carburetor on the Neva MB-2K

I will try to summarize in the article and put in one place the information from various sources. I apologize to the authors of articles that I do not give references to them. I just don’t remember where I got the information from. Not yet claim to 100% reliability of all the information, t.к. some conclusions I draw from my own guesses. Perhaps someone will correct me. Let’s practice, together we will create a small manual on the adjustment. Experts of service centers, of course, know everything, but they do not share their knowledge. The less information they have, the more profitable it is. After all, the Neva has long been produced, and there is no literature on repair and adjustment. And it won’t. As in my case, the answer is: “Bring it to us”! And if it’s another state, or thousands of miles to the service shop, then how. I’m not the only one. I read in different forums, people are interested in how it works and how to fix it. So I’ll try the easiest one. Some people will understand it, and newcomers may find it a little easier to understand.

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Just had a problem adjusting the Neva MB-2. During operation, I wiped the rod of the centrifugal regulator with a cloth, and I guess it wasn’t tightened enough, and it rotated. After that, I tried for a long time to get it up and running, but it didn’t work. I will try to describe how I adjusted it, how it works.

I’ll start with the centrifugal regulator. Its purpose is to keep constant engine crankshaft speed with variations in shaft load. Т.е. so that the single-axle tractor doesn’t stall when you’re ploughing, for example. At the same time through the wheels, gearbox, pulley, belt, engine pulley begins to slow the engine and if it were not for the centrifugal regulator, the engine would stall. Because we don’t have the possibility, as with a car, of pushing harder and harder on the throttle. The design is very clever.

After the engine is started, the regulator weights are unwound. they move apart due to the centrifugal force, opening like a flower and pushing forward on the rod, turning the regulator lever. Now if we load the engine, the rotation of the engine will start to slow down. The speed of the weights will also decrease, they will start to fold (cover like a flower) and the regulator lever will start to go back, which will cause the turn through the centrifugal regulator lever, traction, carburetor throttle to increase fuel consumption, t.е. turn on the gas. Т.е. now you don’t have to worry about the engine stalling under load. As soon as we reduce the load, the weights diverge again and turn the throttle to throttle reduction via all linkages. There is another spring in this whole line. When we increase the gas, it stretches through the cable and the “G” shaped bracket and counteracts the turn of the throttle valve to decrease the gas.

Next. Т.к. revolutions “stagger” when the choke is fully open, then a lean mixture is coming out. It needs to be adjusted. Screw in the idle mixture adjustment screw as far as it will go. Now turn this screw a turn and a half and start the engine. The design of the carburetor is such that when we turn the screw in, we shut off the air duct and increase the amount of gasoline to the engine. Т. е. we are enriching the mixture, and if we unscrew the screw, we are adding more air, so we are depleting the mixture. Now, with the choke completely open, try to get the most stable rpm with the turn of a screw, then reduce gas to the minimum and again try to get the lowest, but stable engine rpm.

Now look at another important part of the throttle stop screw. With the throttle out, it should rest against the carburetor board. Now we gently crank it out and try to get as low rpm as possible. This screw lets the throttle close at a certain angle. Now it’s possible to test one-axle tractor in business. Let it warm up under load, you can see if the spark plug is properly adjusted mix. Т. к. You won’t see it after idling.

Determining engine problems by the appearance of spark plugs.

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We hope that this article will help you to choose the right spark plug and determine the state of your engine. By the appearance of the spark plug electrode you may determine the condition of the engine, suitability of the spark plug caliber and whether the carburetor and ignition advance angle are properly adjusted.

(a) Very rich air-fuel mixture (much fuel, little air). (b) Faulty ignition system. (c) Oil in combustion chamber (worn: piston rings or valve guide sleeves).

(a) The spark plug has too high a rating, so the electrodes are under-loaded and cannot reach a self-cleaning temperature (above 400-450°C). (b) Using too rich fuel-air mixture (more than 8:1-10:1). (c) Ignition system malfunction. (d) Faulty cooling system (too much cooling).

Cold spark plug or rich mixture But good

Cold spark plug or rich mixture But good

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Cold spark plug or rich mixture But good

Hot spark plug or lean mixture But good

Hot spark plug or lean mixture But good

Hot spark plug or lean mixture But good

(a) A spark plug with too low a rating is used, so the electrodes work under excessive load and exceed the upper limit of optimum temperature (above 850-1000°C). (b) Poor air/fuel mixture. (c) Late ignition advance angle is set. (d) Abnormal combustion of the air/fuel mixture (detonation). (e) Cooling system malfunction (engine overheating).

Too hot spark plug or poor mixture Early ignition

(a) Plug too hot or lean mixture Early ignition

Plug too hot or lean mixture too early ignition

Plug too hot or lean mixture Early ignition

Too hot spark plug or poor mixture Early ignition

That’s all I wanted to share. I apologize if I have not made myself clear. It’s easier for me to explain “on my fingers” or do it myself.


Idle running on a diesel power tiller, cheap and simple, single-axle tractor has worked with such alterations for more than three years, with this modification of the need to buy walkomenschitel has disappeared, but sometimes it is still not enough, but this method has the right to life as the most budgetary. Enjoy watching.

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