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2、Gradual acceleration of engine rotation speed→No speed change→1. Bad performance of fuel supplying
Normal acceleration of engine rotation speed 2. Air filter blocked
3. Ventilation hole on carburetor cover
blocked
4. Muffler exhaust blocked
3、Check ignition timing→Wrong ignition switch→ 1、CDI damaged
Correct ignition timing 2、Magneto failed
3、Pulse generator
4、Check valve clearance→Incorrect clearance→ 1、Incorrect adjustment for valve clearance
Correct valve clearance 2、Valve seat abrasion
5、Check cylinder pressure→Low pressure→ 1、Narrow valve clearance
Normal pressure 2、Valve distorted or seized up
3、Abrasion of valve seat
4、Abrasion of cylinder and piston
rings
5、Damage on cylinder gasket
6、Incorrect timing of gas distribution
7、Incorrect installation of spark plug
out of position
6、Check carburetor→Carburetor blocked→ 1、Dirty fuel
Carburetor without blocking 2、Carburetor without periodic washing
7、Check spark plug→Carbon buildup and incorrect color→ 1、No periodic maintenance was made
Normal spark plug 2、Incorrect heat value of spark plug
3、Too narrow the clearance between
spark plug and electrode
8、Check oil through view windown→Incorrect oil Quantity→ 1、Too high the oil level
Normal oil quantity 2、Too low the oil level
3、Dirty oil
9、Remove cylinder head cover, check lubricant 1、Oil tube blocked
of valve→Abnormal valve lubrication→ 2、Abnormal working of oil pump
Normal valve lubrication
10、Check overheating of engine→Overheated→ 1、Carbon buildup in combustion chamber
Without overheating 2、Used fuel without meeting demands
3、Clutch skidding
4、excessive rich of mixed gas
5、excessive amount of oil
11、Driving in high speed→Detonation of engine→ 1、Abrasion on cylinder and piston
No detonation 2、Carbon in combustion chamber
3、Fuel failed meet specification
4、Too much advancing before ignition timing
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