19
Troubleshooting
Problem Cause
Remedy
1. Tines don’t turn when throttle
– Engine is not seated properly on the gear housing.
– Re-install engine following the instructions
is depressed
2. Engine fails to start
– “
o/
i
” switch is in “
o
” position.
– Move switch to “
i
”.
– No fuel in tank.
– Fill Tank.
– Fuel filter clogged.
– Replace filter.
– Fuel line clogged.
– Clean fuel line.
– Spark plug shorted or fouled.
– Install new spark plug.
– Spark plug is broken
– Replace spark plug.
(cracked porcelain or electrodes broken)
– Ignition lead wire shorted,
– Replace lead wire or attach to spark plug.
broken or disconnected from spark plug.
– Ignition inoperative
– Contact your Mantis Service Department.
– Diaphragm clogged
– Replace diaphragm
3. Engine hard to start
– Water in petrol.
– Drain entire system and refill with fresh fuel.
– Engine under or over choked.
– If flooded by over choking, proceed according to
instructions in operation section. If under choked,
move choke lever to closed position and crank two
or three times.
– Gasket leaks (carburettor or cylinder base gasket).
– Replace gaskets.
– Weak spark at spark plug.
– Contact your Mantis Service Department.
4. Engine misses
– Dirt in fuel line or carburettor.
– Remove and clean.
– Spark plug fouled, broken or incorrect gap setting.
– Clean or replace spark plug – set gap to
(.024-.028 in.) 0.6-0.7 mm
– Weak or intermittent spark at spark plug.
– Contact your Mantis Service Dept.
5. Engine lacks power
– Air filter clogged.
– Clean or replace air filter.
– Muffler clogged.
– Clean carbon from muffler.
– Spark Arrestor Clogged.
– Clean Spark Arrestor
– Poor compression.
– Contact your Mantis Service Department.
6. Engine overheats
– Air flow obstructed
– Clean flywheel cylinder fins and screen.
7. Engine noisy or knocking
– Spark plug in incorrect heat range.
– Replace with plugs specified for engine.
– Bearings, piston ring or cylinder walls are worn.
– Contact your Mantis Service Department.
8. Engine stalls under load
– Engine overheats.
– Remove dust and dirt from between fins
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