Ⅲ. GASOLINE ENGINE CANNOT RUN SMOOTHLY
Piston, cylinder or piston ring is worn
excessively.
Piston pin and piston pin hole are worn
excessively.
Replace piston or piston
pin
Tie rod small head is worn excessively.
Roller bearing for crankshaft main shaft is worn
Too much carbon fouling in combustion chamber
Improper gasoline brand or low gasoline quality
Replace with qualified
gasoline
Engine cannot start
because of spark
lacking
There is water in floater room
Improper spark plug electrodes
Clearance
Something wrong with induced coil,
And so on
Check and replace
Damaged parts