Mantis 7940 User Manual

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Troubleshooting
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 flange”.
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.
• Gasket leaks (carburetor or cylinder base gasket).
• Weak spark at spark plug.
• Drain entire system and refill with fresh fuel.
• Replace gaskets.
• Contact your local authorized dealer.
4. There is black smoke coming from
exhaust
• The muffler screen is clogged • Clean carbon from muffler screen.
See engine manual.
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.
• See “Carburetor Adjustment” in engine manual.
• 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 filter clogged.
• Muffler clogged.
• Spark Arrestor Clogged.
• Poor compression.
• Clean or replace air filter (page 15).
• Clean carbon from muffler, see engine manual.
• Clean Spark Arrestor, see engine manual.
• Contact your local authorized dealer.
7. Engine overheats. • Air flow obstructed • Clean flywheel cylinder fins and screen.
See engine manual.
8. Engine noisy or knocking. • Spark plug in incorrect heat range.
• Bearings, piston ring or cylinder walls are worn.
• Replace with plugs specified for engine.
• Contact your local authorized dealer.
9. Engine stalls under load. • Engine overheats. • Remove dust and dirt from between fins.

Mantis 7940 Specifications

General

Brand	Mantis
Model	7940
Category	Tiller
Language	English