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2. GENERAL INFORMATION VITALITY 50
ENGINE LACKS POWER
Inspection/Adjustment Symptom Probable Cause
Start engine and
accelerate lightly for
observation.
Clogged air cleaner
Engine speed Engine speed does Clogged fuel filter
increases not increase Clogged exhaust muffler
sufficiently Faulty auto bystarter
Check ignition timing
(using a timing light).
Faulty CDI unit
Correct timing Incorrect timing Faulty A.C. generator
Test cylinder
compression (using a
compression gauge)
Worn cylinder and piston
Normal Abnormal rings
compression compression Blown cylinder head gasket
Faulty reed valve
Check carburetor for
clogging
Not Clogged Clogged Clogged carburetor jets
Remove spark plug and
inspect
Plug not fouled or Plug fouled or Fouled spark plug
discolored discolored Incorrect heat range plug
Check if engine
overheats
Mixture too lean
Poor quality fuel
Engine does not Engine overheats Excessive carbon build-up in
overheats combustion chamber
Ignition timing too early
Rapidly accelerate or
run at high speed
Excessive carbon build-up in
Engine does not combustion chamber
Engine knocks Poor quality fuel
knock
Clutch slipping
Mixture too lean
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