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Simplified troubleshooting:
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In case of bad ignition, not running smoothly in low speed, check if there is white smoke
issuing from air intake of the crankcase. If it is the case, dismount the cylinder, piston,
piston rings and measure them according to the above table. The causes may be the
wear or break of piston pins.
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If there is white smoke issue from muffler, its causes may be:
Wear or break of piston pins.
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Serious wear of pistons and cylinders due to friction.
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Wear of connecting rod small end holes and
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piston rings.
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Knocking pistons:
Serious damage of cylinders, pistons, and piston rings by friction wear.
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Wear of piston pins and piston pin holes.
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Low compression rate:
Wear or break of piston rings.
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Wear or damage of cylinder
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walls and pistons.
Too narrow gap or no gap at all of valve.
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Gap between valve and its seat.
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Valve burnt.
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Valve untimely.
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Spark plug not tightened.
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Gas leak at cylinder head washer.
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Too high compression rate:
Piston hea
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d or combustion chamber unclean.
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Abnormal engine noise:
Bearing of the end transmission mechanism loosened.
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Bearing of crank loosened.
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