If the chainsaw Friendship stopped starting after winter storage or a sharp jump in turnovers, the first thing to do is check for a spark on the spark plug. Often, owners immediately begin to disassemble the carburetor, although the problem lies in the elementary lack of ignition of the mixture. Lack of spark It blocks the engine, making any manipulation of the fuel supply meaningless. For diagnosis, you need to twist the candle, attach a high-voltage wire to it and press a metal skirt to the cylinder, after which you pull the starter several times.
Visual assessment of the electrode provides primary information about the processes occurring inside the electrode. DM-45 engine or modifications of it. If there is a spark, but it is weak or intermittent, the ignition coil may have malfunctioned or the gap is broken. A dry candle will indicate problems with the supply of gasoline, and wet and black - for the re-enrichment of the mixture or the use of poor-quality oil.
⚠️ Warning: When checking for a spark, never hold a candle with your hand on weight - an electric shock from a magneto can be palpable and unpleasant, although not fatal. Always ensure reliable contact of the candle body with the engine mass.
Failures in the ignition and fuel supply systemThe ignition system of the chainsaw Friendship, despite its archaic nature compared to modern analogues, is highly reliable. However, the capacitors lose capacity over time, and the contacts of the interrupter oxidize or burn. If the spark is absent completely, it is necessary to check the integrity of the high-voltage wire and the condition of the contacts under the flywheel. Sometimes the wire just jumps off the candle or breaks through the body in the presence of cracks in the insulation.
In parallel with electricity, the fuel supply to the cylinder should be evaluated. Fuel mixture The gas must be fresh; if the gas has been in the tank for more than two weeks, its octane number drops and the engine refuses to work. Old fuel forms a resinous plaque that clogs the carburetor's jellyplates and fuel hoses. For normal operation of the two-stroke engine of Friendship requires a mixture of gasoline AI-92 and a special two-stroke oil in a ratio of 1:25 or 1:30, depending on the recommendations of the oil manufacturer.
⚠️ Note: The use of pure gasoline without adding oil is strictly prohibited. This will lead to instant overheating and bullying of the piston group, which will require major repairs.
Problems of the KMP-100 carburetor and its modificationscarburetor KMP-100 It is the heart of the fuel system and is often the cause of unstable operation. If the saw starts, but immediately stalls or does not keep pace, most likely, the regulation is disturbed or the channels are contaminated. The membrane of the carburetor blubbers over time and ceases to respond correctly to the vacuum, because of which the pump does not pump fuel. It is also worth paying attention to the condition of the needle and shut-off valve.
Cleaning the carburetor requires care: you can not use metal wire for cleaning the chillers, as you can change their throughput. It is best to blow all the channels with compressed air and wash with a special cleaner. After assembly is often required carburettor screws of quality and quantity of mixture so that the engine is stable at idling and develops maximum revolutions under load.
Rotor adjustment procedure
First, wrap the quality screw to the end (not much), then turn on 2-3 turns. Start the engine and warm up. With the idling screw, achieve stable operation of the chain at minimum speeds. If the saw stalls with a sharp gas, turn the screw of quality a little.
Violation of tightness and compression in the cylinderAbsence or low compression One of the biggest challenges to launch. If the starter does not have a characteristic resistance and compression sound, then the required pressure is not created in the cylinder. The reasons may lie in the wear of piston rings, cylinder jacking or violation of the tightness of the glands of the crankshaft. Suction of air through the glands leads to impoverishment of the mixture and the inability to start.
Check the tightness can be with the help of a compressometer or manually, plugging the outlet of the carburetor and the exhaust window of the muffler. If the piston does not create a vacuum, it is necessary to disassemble the engine. Particular attention should be paid to the condition of the gasket between the cylinder and the crankcase, as well as the crankshaft oils. Friendship often dries up the pad under the carburetor, which also causes the sucking of excess air.
☑️ Diagnosis of compression
Contamination of muffler and exhaust systemOwners often forget that an internal combustion engine not only consumes air, but also has to effectively emit exhaust gases. Silencer Friendship over time overgrows with soda, especially if the proportion of oil in the fuel was broken upwards. Exhaust windows in the cylinder can also overgrow coke deposits, which drastically reduces power and makes it difficult to start.
To eliminate the problem, you need to remove the muffler and burn or clean the scorch. If the exhaust windows in the cylinder are heavily overgrown, it may be necessary to remove the cylinder and mechanical cleaning (decogging). After cleaning, it is important to collect everything back without damaging the gasket and check the engine. Clean exhaust is the key to stable operation of the two-stroke engine.
| Symptom | Probable cause | Method of elimination |
|:--- |:--- |:--- |
| Candle dry | No fuel | Check of filter, hoses, membranes of carburetor |
| Candle wet and black | Re-enrichment of the mixture | Blowing of the cylinder, adjustment of the carburetor |
| No spark | Magneto malfunction | Candle replacement, contact check, condenser replacement |
| No compression | Wear of rings or ossels | CNG repair, replacement of ossels, leakage check |
Mechanical damage and starter conditionStarting the engine is not possible if the starter does not turn the crankshaft with the required speed. Starter mechanism Chainsaw Friendship consists of ratchets and pulleys that wear out over time. If the ratchets are slime-slime or the starter spring has burst, the tugging on the cord will be blank. It is also worth checking the condition of the cord itself: if it is misfiring, it can get stuck in the case.
Mechanical damage can be inside the engine: a jammed crankshaft bearing or a rod neck will not allow you to make any full turn. In such cases, the starter may simply crack or tear. Diagnosis requires removal of the starter and visual inspection of the possibility of turning the shaft with your hand. Any snag indicates the need for serious repairs.
To facilitate the start of a cold saw, use “pumping” fuel by pressing the primer several times (if any) or simply plucking the starter with the air damper closed but without the candle to create a rarity in the carburetor.
Comprehensive diagnostics and procedure of actionWhen a chainsaw is not started, it is important to act consistently, eliminating simple reasons before moving on to complex ones. Start by checking the fuel and candle, then proceed to the ignition system and carburetor. Only after eliminating these factors should think about disassembling the engine to check the compression and osteoils. The system approach saves time and prevents disassembly of serviceable nodes.
Regular maintenance, including cleaning the air filter, checking candles and using a quality fuel mixture, significantly reduces the risk of sudden failures. Chainsaw Friendship A reliable tool that, with proper care, can work for decades. Remember that most startup problems are solved by prevention and adjustment, not replacement parts.
The secret to success is that 80% of launch problems are solved by replacing a candle, cleaning a carburetor and using fresh fuel in the right proportion.
Why does a chainsaw Friendship start and immediately die?
Most often this occurs due to clogging of the fuel filter in the tank or a violation of the ventilation hole in the tank cover. Also, the cause may be air sucking through the gasket of the carburetor or ossicles, which impoverishes the mixture.
Which oil is best used for a mixture with gasoline?
For older models of Friendship, it is recommended to use special two-stroke oils for air cooling (designation 2T). The ratio is usually 1:25 (40 ml per 1 liter) for running and 1:30-1:40 for further use, depending on the quality of the oil.
What to do if a candle is flooded and the saw does not start?
It is necessary to twist the candle, dry the cylinder, several times turning the engine with a starter without a candle. The candle itself should be calcined over the fire or replaced with a new one. After that, collect everything back and try to run with a fully open air valve.
Can I use AI-95 gasoline instead of AI-92?
The use of AI-95 is not recommended for two-stroke engines of old design, such as the Friendship, as they are designed for 92nd gasoline. A higher octane number can lead to later combustion and overheating, although in emergency cases a single application is permissible.