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Moist electrode of spark plug
Dry electrode of spark plug
Check whether there is oil
spillover in the carburetor
Drop a little gasoline into the cylinder for trial startup
1.
Check whether the
float needle valve
and the valve seat are
firmly combined
2.
Check whether the
conical surface of
float needle valve is
abrasive as
stepped.
3.
Check whether the
carburetor float is
broken
4.
Check whether the
carburetor float is too
low
Check whether air
filter is blocked
Flameout shortly
after startup
Continue to work
after startup
The carburetor is blocked
inside or the float is too
high
Startup device of
carburetor (startup &
enrichment system) is
at fault
1.
Check leakage on outer
connections of the engine.
2.
Check whether the piston
ring is seized in the groove or
whether it has enough
elasticity.
3.
Check abrasion of the piston
ring and the cylinder.
1.
Check whether the
air vent in fuel tank
cover is blocked.
2.
Check whether the
fuel filter and the
fuel switch are
blocked.
3.
Check whether the
fuel switch works
normally.
4.
Check whether the
oil hole of the
carburetor
is
blocked.
5.
Check whether the
carburetor float is
too high.
Remove spark
plug and check
it