Generic Onyx 50, Service Manual

Page: 23 / 173

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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 closed
2. Check whether the
conical surface of float
needle valve is abrasive
as steps
3. Check whether the float
needle valve is broken
4. Check whether the float
needle valve 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
Remove spark
plug and check it