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FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Fuel pump faulty Repair or replace
Fuel line clogged or clamp loose Clean or replace if required
Cracked or broken fuel line Replace with new hose
Main jet blocked Clean jet
Throttle lever motion restricted Check all linkages
Dirt or water in fuel line or carburetor Clean lines and carburetor. Replace filter
Clogged fuel filter Check and replace if required
Incorrect carburetor float setting Check/replace float
Engine flooded Push choke in. Clean/or replace spark
plugs
Engine fuel starved Use choke and push in as soon as engine
runs smoothly
Air intake tube is blocked Repair or clean
Clogged air filter Wash or replace as required
Plugged muffler or pipe Repair or replace
Low compression in engine Check and repair
ENGINE RUNS ROUGH OR LOSS
OF POWER
Dirty or clogged air filter element Replace as required
Incorrect choke adjustment Adjust choke
Dirty or incorrectly gapped spark plug Clean plug and set gap
Faulty magneto Check and/or replace
Leak in carburetor gasket Inspect and replace if required
Faulty ignition wiring Repair/replace correct wiring
Spark plug wire Test and replace if necessary
Incorrect valve lash Check and adjust if required
Weak or damaged valve springs Replace
Damaged intake/exhaust valves Replace
Incorrect carburetor float setting Check/replace float
Dirt or water in fuel line, carburetor Clean lines, carburetor and replace filter
Plugged fuel tank vent Clean or replace vent cap
Muffler damaged or plugged Repair or replace
Fuel pump vent dirty Clean and replace if required
Fuel pump has a ruptured diaphragm Replace
Low compression Check engine
Poor quality of fuel Drain and replace with correct clean fuel
Condition Possible Cause Correction
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