4. DISASSEMBLING AND SERVICING
4-1-3 Speed Unstable
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 deposit in combustion chamber
Improper gasoline brand or low gasoline quality
Replace with qualified gasoline
There is water in float chamber
improper spark plug electrodes clearance
Something wrong with induced coil, and so on
Check and replace damaged parts
4-1-4 Unable Igniting
Check fuel line and dredge
Dismantle float chamber and eliminate it
Spark plug is punctured, or
short-circuited by carbon deposit
Side electrode of spark plug is dropped
out
Replace spark plug and clean the cast
High-tension wire is dropped out
Ignition coil is punctured or
short-circuited
Parking wire is located on engine body
Find out meeting and insulate
Cylinder is seriously scored and valve
dropped out
Repair or replace damaged parts
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