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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 or stale fuel mixture. – Drain entire system and refill with fresh fuel mixture.
– Too much oil in fuel mixture. – Drain and refill with correct mixture.
– 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.
– carburettor out of adjustment. – See “carburettor Adjustment”
– 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.
– carburettor improperly adjusted. – See “carburettor Adjustment”.
– 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.
– carburettor out of adjustment. – See “carburettor Adjustment”.
– Muffler clogged. – Clean carbon from muffler.
– Clogged exhaust ports. – Remove muffler, rotate engine until the piston
is at top of cylinder. With a wooden scraper or
blunt tool, remove all carbon from exhaust
ports. Be careful not to scratch or damage
piston or cylinder walls. Blow out all loose
carbon with compressed air. Install muffler and
gasket.
– Spark Arrestor Clogged. – Clean Spark Arrestor
– Poor compression. – Contact your Mantis Service Department.
6. Engine overheats – Insufficient oil in fuel mixture – Mix fuel as described in starting instructions.
– 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 – carburettor adjustment too “lean”. – See “carburettor Adjustment”.
– Engine overheats. – Remove dust and dirt from between fins