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● Cylinder pressure check
· Drain the gasoline in the fuel tank out.
· Drain the gasoline by loosening the oil drain bolt of the carburetor
· Remove the spark plug cap and spark plug and install the cylinder pressure meter.
· Forcibly pull the recoil starter several times and measure compression force
（Cylinder pressure：1.15Mpa at 1200rpm）
4-1-3 Speed unstable
TROUBLE CAUSE REMEDY
Piston, cylinder or piston ring is worn excessively. Replace the worn
Piston pin and piston pin hole are worn
excessively.
Replace piston or piston pin
Tie rod small head is worn excessively. Replace tie rod
Knocking sound
Roller bearing for crankshaft main shaft is worn. Replace roller bearing
Engine is too hot Shoot trouble
Too much carbon deposit in combustion chamber Clear away
Abnormal combustion
Improper gasoline brand or low gasoline quality Replace with qualified gasoline
There is water in float chamber Clean
improper spark plug electrodes clearance Adjust
Spark lacking
Something wrong with induced coil, and so on Check and replace damaged parts
Pressure meter
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