3. TROUBLESHOOTING
17
3-1-3 Speed Unstable
TROUBLE CAUSE
REMEDY
Knocking sound
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
Abnormal
combustion
Gasoline Engine is too hot
Shoot trouble
Too much carbon deposit in combustion chamber
Clear away
Improper gasoline brand or low gasoline quality
Replace with qualified gasoline
Spark lacking
There is water in float chamber
Clean
improper spark plug electrodes clearance
Adjust
Something wrong with induced coil, and so on
Check and replace damaged
parts
3-1-4 Unable Igniting
TROUBLE CAUSE
REMEDY
Unable
igniting
Fuel supply
system
Fuel is finished
Refill fuel
Carburetor is clogged
Check fuel line and dredge
Float is leaking
Repair
Needle valve is sticked
Dismantle float chamber and
eliminate it
Ignition
system
Spark plug is punctured, or
short-circuited by carbon deposit
Replace spark plug
Side electrode of spark plug is dropped
out
Replace spark plug
High-tension wire is dropped out
Weld on
Ignition coil is punctured or
short-circuited
Replace ignition coil
Parking wire is located on engine body
Find out meeting and insulate
The other
Cylinder is seriously scored and valve
dropped out
Repair or replace damaged
parts
