Tanaka TBC-420PF, Service Manual

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4. Trouble Shooting
Engine doesn't crank
Check recoil starter system
Check internal engine parts
Check spark plug
No spark or
Bad connection/ignition coil
weak spark
Incorrect air gap/ignition coil
Bad ignition coil
Engine won't
start
Clogged fuel filter
Clogged or incorrect of air vent valve on
Engine cranks
engine case
Fuel doesn't
Air leak at intake
reach cylinder
Air leak from engine
Clogged and/or leaks pulse to carburetor
Air leak from fuel pipe
Air leak from carburetor
Incorrect carburetor adjustment
Bad diaphragm in carburetor
Incorrect carburetor valve hinge height adjustment
Bad fuel-Use proper/fresh fuel
Engine flooded-Check carburetor
Fuel and spark
Muffler gasket partially covering exhaust port
reach cylinder
of cylinder
Excess carbon in muffler/spark arrestor
Poor cylinder pressure
Worn or damaged internal parts
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