TROUBLE
CAUSE
REMEDY
When increasing
throttle, speed
increase slow or
even decrease and
stop running
Fuel supply system
1. Air in fuel line or fuel line clogged
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3. In carburetor, needle valve hole and main
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4. Fuel cock is clogged up
5. Too much carbon deposit incombusting
chamber.
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exhaust pipe
7. Air cleaner is cloed up
8. Intake pipe is leaking
1. Exhaust air or dredge fuel line
2. Readjust
3. Clean and biow to get through
4. Clean, replace damaged part
5. Clear away
6. Clear away
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8. Repair or replace
Poor compression
1. Piston or cyhnder or pistoll ring is worn
2. Air leakage from the surface by which
cylinder block contacting Replace cylinder
gasket with cylinder head.
3. Too big or too small valve clearance
4. Valve tightness is poor
1. Replace the worn
2. Replace the cylinder gasket
3. Readjust
4. Repair
TROUBLE
CAUSE
REMEDY
Knocking sound
1. Piston, cylinder or piston ring is worn
excessively
2. Piston pin and piston pin hole are won
excessive
3. Tie rod small head is worn excessive
4. Roller bearing for crankshaft main shaft is
worn
1. Replace the worn
2. Replace piston or piston pin
3. Replace tie rod
4. Replace roller bearing
Abnormal
combustion
1. Engine is too hot
2. Too much carbon deposit in combustion
chamber
3. Improper gasoline brand or low gasoline
quality
1. Shoot trouble
2. Clear away
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Spark lacking
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2. Improper spark plug electrodes clearance
3. Something wrong with induced coil, and so
on
1. Clean
2. Adjust
3. Check and replace damaged parts
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Gasoline Engine Gan not Running Unsmoothly
14
Gasoline Engine
»
Operator’s Manual