Tanaka TBC-420PF Service Manual page 22

Power is low or poor
Runs inconstantly
Engine doesn't
run properly
Doesn't accelerate
Engine RPM surging
Cutting attachment
doesn't turn
Check gear case
Check drive shaft
Check clutch
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Carbon deposits in mu er
Poor cylinder pressure
Dirty air cleaner element
Incorrect carburetor adjustment
Worn or damaged internal parts
Bad spark plug
Bad ignition coil
Incorrect carburetor adjustment
Air leak at intake
Air leak from fuel pipe
Lean carburetor adjustment
Clogged fuel lter
Engine isn't warm enough, Warm up engine
Lean carburetor adjustment
Air leak at intake
Air leak from pipe
Clogged fuel lter
Broken clutch shoes
Clutch shoes worn out
Shoes sticking on clutch step bolts
Clutch drum broken or worn out
Broken pinion/gear
Broken gear shaft
Broken drive shaft or rounded o at spline
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