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water pipeline blocked
·Thermostat does not open
.Too much carbon deposit in
combustion chamber
·Oil too much insufficient or poor
·Ignition timing too late or too early
·Clutch slipping
clean water pipeline
Replace
Clean carbon deposit
Adjust oil level
Readjust
Repair or replace
4.Carburetor firing back
·Ignition timing too late
·Over heat
·Mixture gas too poor
A. Carburetor jet blocked
B. Insufficient of fuel supply
·Valve leakage
·High voltage cable damage
Adjust
Done as item 3
Clean
Done as item 1-c
Adjust clearance or lap the valve
Replace
5.Knocking noise from
inside
·Ignition timing too early
·Too much carbon deposit in
combustion chamber
·Main bearing connecting rod
hearing over worn
·Cylinder-piston-piston pin over worn
·Piston ring and ring edge over worn
·Valve clearance too big.
·Balance chain was long-drawn
Adjust
Clean
Replace or repair
Replace or repair
Replace
Adjust
Replace
6. Oil consumption
excessive
·Valve seal worn or damage
·The spring of the piston scraper ring
reduce or piston ring openings do
not stagger
·Cylinder worn
·Over heat or crankshaft case
breathing blocked
Replace
Replace or adjust
Repair
Reduce heating or clean the
orifices
7.Oil pressure too low
·Too much or too less oil
·Oil temperature too high
·Oil too poor
·Oil pipe leakage
·Oil filter blocked
·Oil pressure meter problem
Replenish or drain out the oil
Check cooling system
Replace
Repair or replace
Clean or replace
Replace
8.Echaust manifold firing
back
·Fuel level too high in the carburetor
float chamber
·Exhaust valve leakage
·Firing too late
Drain out the unnecessary fuel and
adjust fuel level in the float chamber
Lap the valve
Adjust ignition angle
9.Without idle speed
·Carburetor valve open too big
·Carburetor idle speed jet out of
function
·Inlet pipe leakage
·Spark plug carbon deposit or wrong
gap
Adjust
Adjust or replace
Tighten or replace
Clean or adjust
