Mantis 7990 User Manual

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Problem Cause Remedy
1. Tines don’t turn when throttle
is depressed.
• Engine is not seated properly on the gear housing.
• Re-install engine following the instructions on
page 16 (How to reseat the ange).
2. Engine fails to start.
• 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.
• 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.
3. Engine hard to start.
• Water in gasoline or stale fuel mixture.
• Engine under or over choked.
• Gasket leaks (carburetor or cylinder base gasket).
• Weak spark at spark plug.
• Drain entire system and rell with fresh fuel.
• Drain and rell with correct mixture.
• If ooded 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.
• Replace gaskets.
• Contact your local authorized dealer.
4. There is black smoke coming
from exhaust.
• The mufer screen may be clogged.
• The exhaust port may be restricted.
• Clean carbon from mufer screen.
• Clean exhaust port.
5. Engine misses.
• Dirt in fuel line or carburetor.
• Carburetor improperly adjusted.
• Spark plug fouled, broken or incorrect gap setting.
• Weak or intermittent spark at spark plug.
• Remove and clean.
• Clean or replace spark plug - set gap to .024-.028
in. (0.6-0.7 mm).
• Contact your local authorized dealer.
6. Engine lacks power.
•Air lter clogged.
•Carburetor out of adjustment.
•Mufer clogged.
•Clogged exhaust ports.
•Spark Arrestor Clogged.
•Poor compression.
• Clean or replace air lter.
• Clean carbon from mufer.
• Clean Spark Arrestor.
• Contact your local authorized dealer.
7. Engine overheats. • Air ow obstructed. • Clean ywheel cylinder ns and screen.
8. Engine noisy or knocking.
•Spark plug in incorrect heat range.
•Bearings, piston ring or cylinder walls are worn.
• Replace with plugs specied for engine.
• Contact your local authorized dealer.
9. Engine stalls under load.
• Engine overheats.
• Carburetor adjustment too “lean.”
• Remove dust and dirt from between ns.
• Contact your local authorized dealer.
Troubleshooting

Mantis 7990 Specifications

General

Brand	Mantis
Model	7990
Category	Tiller
Language	English