KYMCO Mongoose 90 R, Owner'S Manual

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Troubleshooting chart
Use electric starter
to see if there is
compression.
There is compression.
Compression normal.
No compression.
Ask a KYMCO dealer to inspect.
2. Battery
Use electric
starter.
Engine turns
over quickly.
Battery good.
Check fluid, recharge, check connections.
Engine turns
over slowly.
Water or dirt
mixed in fuel.
Turn the fuel
valve to
Clean filter element
and fuel tank.
Check fuel flow.
No fuel.
Fuel valve
Clean fuel valve.
Turn the fuel
valve to "OFF".
Turn the fuel
valve to "RES".
Supply fuel.
1. Fuel
Remove the fuel
hose from the
fuel valve.
Check if there is
fuel in the fuel
tank.
There is fuel.
Some fuel.
No fuel.
Restart engine.
Ask a KYMCO dealer to inspect.
Adjust plug gap or
replace plug.
Spark weak.
No spark.
Spark good.
Ignition system normal.
4. Compression
3. Ignition
Remove plug and
check electrode.
Wipe clean with dry
cloth.
Attach plug cap and
ground to chassis.
Use electric
starter.
Wet
Dry