Why is it difficult to start the chain saw?

1. Oil supply failure in the oil circuit (high incidence)
Wrong mixture ratio, gasoline deterioration, too much/too little engine oil, abnormal combustion and difficulty in ignition
The breather hole of the fuel tank is clogged, causing negative pressure in the fuel tank and interrupting the fuel supply.
The fuel filter is clogged, the oil pipe is cracked, and the fuel supply is insufficient.
The carburetor oil passage and oil needle are clogged, the mixture is too thin or too rich; the idle speed and mixture ratio screws are out of adjustment
2. Air intake system problems
The air filter element is covered with wood chips, the air intake is insufficient, and the mixture is too rich and floods the cylinder.
The carburetor intake gasket is damaged and leaking, and the mixture is too lean and cannot be started.
The cooling air door is operated incorrectly and the choke is not closed.
3. Ignition system failure
Spark plug carbon deposition, electrode ablation, gap deviation 0.6~0.8mm, weak spark
The high-voltage package is aging, the high-voltage wire is broken and leaking electricity, and there is no ignition spark.
Spark plug cap is loose and poor contact
4. Exhaust blockage
The muffler has serious carbon deposits, the exhaust is blocked, the exhaust gas in the cylinder cannot be discharged, and ignition cannot occur.
5. Insufficient cylinder compression
The piston rings and cylinders are worn and the cylinder pressure is too low; the crankcase and box seals are leaking and the compression force is not enough.
6. Starting mechanism and mechanical issues
The spring of the starter disk pull rope is weak and the pawl is worn, so it cannot drive the crankshaft to rotate.
The chain is stuck, the guide plate is clamped, and the engine load is too heavy and it cannot be pulled.
The radiator of the cylinder block is clogged, and the engine is overheated and difficult to start.