How to start the trimmer is a question that owners are puzzled in case of a device breakdown. And after successful repair of the trimmer, the owner tries to avoid repeating the same situation.
The reason the trimmer fails may be:
- tank overflow;
- excessive fueling in engines equipped with a manual supercharger;
- wear in the motor of valves, cylinders, nozzles, cam followers and other moving parts;
- the tanks run out of gasoline and / or oil;
- out of order spark plugs;
- clogged fuel or air filters;
- misregistered or burned valves in the motor.
The test begins with the presence of oil and fuel both in the tanks and a small portion of it in the engine system. An “empty” motor will not start despite a full tank, as well as a crowded one.
How to start a trimmer motor or a brushcutter?
The new trimmer is easy to commission.
- Check the motor type of the device. Trimmers are equipped with a 2- or 4-stroke motor.
- Buy oil for this type of motor. Gasoline for trimmer - AI-92/93/98, sold at all gas stations.
- Mix oil with gasoline. Mineral oil is mixed in a ratio of 1: 34 with gasoline, synthetics - in 1: 50. Follow the recommendations of the manufacturer of the trimmer for the viscosity of the oil (see the label on the flask). Most often used multigrade oil 5W-30. Do not use unchecked motor oils.
- Pour a small amount (e.g. 0.5 liters) of the resulting fuel into the tank.
- Close the air damper by sliding the desired lever (see instructions).
- Turn the ignition key (or handle) to the “on” position - without this, the trimmer will not start. Beginners often make this mistake.
- Pump some fuel into the carburetor - if there is a manual “rocking chair” with a separate button or lever (see instructions). It takes 4-7 clicks.
- Set the trimmer on a flat surface.
- Gently pull the starter cord until you feel it is braking. Then pull it out sharply, but not completely. Repeat this movement up to 4 times.
- If the engine does not start, open the air damper again, otherwise the spark plugs will fill with gasoline with further cord movements. Perform 2-3 attempts to start the engine with the handbrake open.
- If the engine still does not start, close the shutter and make a few more attempts to start it.
- After starting the engine, press the throttle lever to engage idle.
Let the motor warm up - 5-10 minutes is enough. Do not start mowing grass immediately after a cold start - the trimmer motor must run in.
Starting the brushcut for the first time or after a long downtime
Motokosa differs from the trimmer in that the line cutter for the grass is not a fishing line, but a mechanical gearbox or a winch based on gears, equipped with a knife. The knife drive is much more powerful than the forestry mechanism - a powerful brushcutter is also used when cutting bushes. Both Chinese and European gas mowers are no different when the declared power is real.
To lubricate the gears of the gearbox, lithol or solid oil is used. After checking the gearbox, prepare for operation the motor itself - according to the above instructions. If the start failed, the problem is already in the engine.
Add fuel through the openings for the candles
If there is no manual pumping on the trimmer motor and the device does not start up, pour some fuel into the motor itself through the spark plugs. Do the following.
- Check if the fuel level in the tank is sufficient to drain a small amount. Only 20 ml will be required.
- Remove the cap from the candle and unscrew it with a candle key.
- If the candle is dirty on a used trimmer, rinse and bake it. There should be no deposits on the electrode electrodes. Do not damage the ceramic insulator of the center conductor. In the new trimmer, check the candles for a factory defect.
- Return the spark plug back and check the spark ignition (discharge between the electrodes) when the starter fires.
- Remove the candle again. Using a 20- or 50-cc syringe, pour 20 ml of gasoline into the hole from under the candle.
- Insert and fix the candle, setting the value of its technological gap not less than and no more than a millimeter.
- Pump up fuel with the button (or lever) of pumping - if it is on your trimmer model. Press the button every 4 seconds.
Now try to start the engine. Close the air damper immediately after starting.
Ignition System Check
If the trimmer has already been used, then check the condition of the removed (at the moment) candle, changing it with any other one. If, when examining a candle, for example, a ceramic dielectric crumbled, the electrodes bent, buy the exact same one, guided by the product code knocked out on the part itself and checking it with a marker in the trimmer instruction manual. A candle without an insulator and / or with bent electrodes will not give normal sparks when triggered.
If the spark plugs are in order, but spark ignition of fuel is not observed, check the ignition coil with an ohmmeter (multimeter). Lack of readings (infinite resistance) is a sign of winding breakage. If it is sintered for overheating due to inter-turn short circuit, there will not be enough voltage for spark breakdown.
Since a very thin wire is used for it, due to which it converts 12.6 volts from the battery to 30000, it is very difficult to fix it (rewind) even in garage conditions. Replacement of the coil will be required.
If the previously used trimmer does not start, and suspicion falls on a dirty engine, then before starting it will need to be cleaned. To wash the carburetor with a special solvent, do the following.
- Remove the plastic caps and air filter.
- Having access to the carburetor, remove it and disassemble.
- Blow out solvent into the main jet or other engine processing channels (through flushing). Make sure that there is nothing extraneous on the motor.
- Reassemble the entire system in reverse order. Prepare the fuel mixture you need (if the engine is 2-stroke) or pour separately in each tank (if the engine is 4-stroke) suitable oil and gasoline.
- Repeat the steps to start the engine from the previous instructions.
If the start failed, a complete disassembly of the carburetor, valve adjustment, piston inspection, and full cleaning of the nozzles will be required. The staging of this process varies depending on the type of motor.
Spark Arrester Integrity Check
A non-starting trimmer is a consequence not only of problems with a combustible starter and the motor itself, but also of a clogged exhaust system. The spark extinguishing screen must allow free passage of exhaust gases. It is located in the silencer. Its purpose is to prevent the release of hot sparks to the outside. Otherwise, falling on flammable materials, for example, the same gasoline, these sparks can ignite them. If there is soot on it, the muffler must be disassembled, and the net itself must be cleaned with a metal brush.
Unstable carburetor operation
The behavior of the motor during unstable operation manifests itself in one of the following ways:
- short-term engine operation, in general - the launch failed;
- the motor starts and runs - but stalls after one or several minutes of operation.
- insufficient fuel pumping or lack thereof;
- improper dosage of gasoline and oil (for trimmers with a 4-stroke engine);
- You yourself have prepared the wrong mixture (for 2-stroke engines);
- You’ve knocked down the factory setting with the carburetor adjusting screws.
The “treatment” of the unit for this problem is the replacement of a worn carburetor or the cleaning of its parts from soot and tar. After flushing, often re-adjusting the valve mechanism is required. Special keys and probes will already be required here to set the normal valve clearance. If the cause of the breakdown is still not in the engine, carry out a diagnosis of the ignition system. Then start the engine without stepping a step from the instructions above.
There are times when even a complete cleaning and enumeration of the engine do not give a result. In this case, the engine still stalls, no matter what you do. The reason is a violation of the fuel supply adjustment using one of the screws on the carburetor. The motor does not receive the necessary portions of gasoline - and periodically stalls. If you unscrew this screw in the opposite direction, the engine will smoke unburned gasoline and soot, and the smell of burning will be off-scale. In this case, contact the service center for the repair of motor vehicles.
The second idle control screw is not critical. You can adjust the idle settings as you wish.
Fuel tank drain
Gasoline, which is bred with oil for two-stroke engines, is so arranged that during prolonged storage its heavier fractions sink to the bottom, and light ones float up. Gasoline, in which there is too much oil, is in this case a thin layer (of the total volume of fuel) that has sunk to the very bottom. The fuel line, communicating with the bottom of the tank, first sucks it in - by the efforts of the fuel pumping system on the motor itself. Accordingly, the engine, spending this "oily" portion of gasoline, cokes its valves, channels and pistons when burned. The situation is not saved by the next portion of gasoline, in which there is almost no oil at all: coal and tar can not be washed off without the help of a solvent. Pistons and valves operate with a much greater load than intended - why prematurely and fail. If the contamination of the parts is too great, the trimmer simply will not start.
In engines with increased structural complexity, they resort to ultrasonic cleaning performed in the conditions of a technical center (car service center).
After the end of the work session on a gas trimmer with a two-stroke engine, drain the remaining gasoline from the tank. After the motokosa or trimmer is taken out, for example, after winter, the fuel is shaken and poured into the tank. They store such gasoline in stainless steel cans, and do not keep it all the time in the tank of the device. If you work on a trimmer every day upon departure to order - you can not drain gasoline at the end of the working day.
See how to start a gas trimmer in the next video.