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Handle it according to
Item 1.7.
Skirt section of insulating part is black and when the
engine runs at middle or low speed, exhaust muffler gives
off black smoke or explodes, acceleration capability is
poor, idle speed is unstable and the engine is apt to stall;
but it runs normally at high speed.,
Air/fuel concentration is too high.
1. Check if air cleaner is
clogged; 2. Check if Carburetor
starter (i.e. cranking enrichment
system)
works
Check if float of carburetor is too
low.
Clutch slips
Remove the spark plug and check
color of skirt section of insulating part
and other abnormalities to judge
mixture ratio of air/fuel.
Skirt section of insulating part is brown.
Mixture ratio of air/fuel is normal.
Check if exhaust of cylinder
and exhaust muffler is clogged
due to carbon deposition.
normally;
3.
2-stroke
lubricating system
1. Check if there is
engine oil in the oil
tank; 2. Check if
engine
oil
pump
works normally; 3.
Check
if
delivery
pipe is clogged.
Check
lubricating
system
engine
4-stroke
lubricating system
1. Check if there is enough
engine oil in the crankcase;
2. Check if viscosity of
engine oil in the crankcase
is too low or the oil is badly
contaminated; 3.Check if
engine oil filter is clogged;
4. Check if engine oil pump
works normal; 5. Check if
lubricating pipe is clogged.
Skirt section of insulating part is
white and engine generates an
interval, carburetor has backfire
and engine power is not enough.
Air/fuel concentration is
too low
1.
Check
if
switch is perfect; 2.
Check if carburetor
engine
float is too high; 3.
Check if the jets and
channels
in
carburetor
clogged.
fuel
the
are
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