bar 670 - Troubleshooting Power and Smoothness Issues

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• When testing the spark plug, never hold the high- voltage wire of
the spark plug with wet hand.
• Make sure there is no spilled fuel outside the engine and that the
spark plug isn’t dipped with fuel.
• To prevent fire, keep sparks far away from the spark plug
mounting hole.
2. GASOLING ENGINE POWER OUTPUT INSUFFICIENCY:
TROUBLE CAUSE REMEDY
When increasing throttle, speed increase slow or even
decrease and stop running
Fuel supply system
Air in fuel line or fuel line clogged Exhaust air or dredge fuel line
Main oil ow hole is not adjusted properly Readjust
In carburetor, needle valve hole and main oil
ow hole clogged.
Clean and blow to get through
Fuel cock is clogged up. Clean, replace damaged part
Too much carbon deposit in combusting
chamber.
Clear away
Too much car bon fouling in mufer and
exhaust pipe.
Clear away
Air cleaner is clogged up. Clean air cleaner lter element
Intake pipe is leaking Repair or replace
Poor
compression
Piston or cylinder or piston ring is worn Replace the worn
Air leakage from the surface by which
cylinder block contacting with cylinder head.
Replace cylinder gasket
Too big or too small valve clearance. Readjust
Valve tightness is poor. Repair
3. GASOLINE ENGINE CANNOT RUNNING SMOOTHLY
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
Roller bearing for crankshaft main shaft is
worn.
Replace roller bearing
Abnormal combustion
Engine is too hot Shoot trouble
Too much carbon deposit in combustion
chamber
Clear away
Improper gasoline brand or low gasoline
quality
Replace with qualied gasoline
Spark lacking
There is water in oat chamber Clean
improper spark plug electrodes clearance Adjust
Incorrect ignition time Readjust
Something wrong with induced coil, and so on Check and replace damaged parts
TROUBLESHOOTING