Troubleshooting - Mantis 7921 Manuel De L'utilisateur

Troubleshooting

Problem
1. Tines don't turn when throttle
is depressed
2. Engine fails to start
3. Engine hard to start.
4. Engine continuously floods.
5. There is black smoke coming from
exhaust
6. Engine misses.
7. Engine lacks power.
8. Engine overheats.
9. Engine noisy or knocking.
10. Engine stalls under load.
Cause
• Engine is not seated properly on the gear housing.
• O/I switch is in "O" position.
• No fuel in tank.
• Fuel strainer clogged.
• Fuel line clogged.
• Spark plug shorted or fouled.
• Spark plug is broken (cracked porcelain or
electrodes broken)
• Ignition lead wire shorted, broken or disconnected from
spark plug.
• Ignition inoperative
• Water in gasoline or stale fuel mixture.
• Too much oil in fuel mixture.
• Engine under or over choked.
• Carburetor out of adjustment.
• Gasket leaks (carburetor or cylinder base gasket).
• Weak spark at spark plug.
• Fuel tank vent line is not in an upright position.
• The muffler screen is clogged
• Dirt in fuel line or carburetor.
• Carburetor improperly adjusted.
• Spark plug fouled, broken or incorrect
gap setting.
• Weak or intermittent spark at spark plug.
• Air filter clogged.
• Carburetor out of adjustment.
• Muffler clogged.
• Clogged exhaust ports.
• Spark Arrestor Clogged.
• Poor compression.
• Insufficient oil in fuel mixture
• Air flow obstructed
• Spark plug in incorrect heat range.
• Bearings, piston ring or cylinder walls are worn.
• Carburetor adjustment too "lean."
• Engine overheats.
Contact us at www.mantis.com
Remedy
• Re-install engine following the instructions on
page 18 "How to reseat the flange".
• Move switch to "I"
• Fill Tank.
• Replace Strainer.
• Clean fuel line.
• Install new spark plug.
• Replace spark plug.
• Replace lead wire or attach to spark plug.
• Contact your local authorized dealer.
• Drain entire system and refill with fresh fuel.
• Drain and refill with correct mixture.
• 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.
• See "Carburetor Adjustment."
• Replace gaskets.
• Contact your local authorized dealer.
• Return the fuel tank vent line to the upright
position and place it under the cylinder cover in
the small "pocket" in the cylinder cover
• Clean carbon from muffler screen (page 17)
• Remove and clean.
• See "Carburetor Adjustment" (page 17)
• Clean or replace spark plug - set gap to .024-.028
in. (0.6-0.7 mm)
• Contact your local authorized dealer.
• Clean or replace air filter.
• See "Carburetor Adjustment".
• Clean carbon from muffler.
• 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.
• Clean muffler screen (page 17)
• Contact your local authorized dealer.
• Mix fuel as described in starting instructions.
• Clean flywheel cylinder fins and screen.
• Replace with plugs specified for engine.
• Contact your local authorized dealer.
• See "Carburetor Adjustment." (page 17)
• Remove dust and dirt from between fins.
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