Engine Lacks Power - KYMCO SUPER8 50 2T Service Manual

2
. GENERAL INFORMATION

ENGINE LACKS POWER

Inspection/Adjustment
Start engine and
accelerate lightly for
observation.
Check ignition timing
(using a timing light).
Test cylinder
compression (using a
compression gauge)
Check carburetor for
clogging
Remove spark plug
and
i t
Check if engine
overheats
Rapidly accelerate or
run at high speed
Symptom
Engine speed
Engine speed
does not increase
increases
sufficiently
Correct timing
Normal
compression
Not Clogged
Plug not fouled or
discolored
Engine does not
overheats
Engine does not
knock
Incorrect timing
Abnormal
compression
Clogged
Plug fouled or
discolored
Engine
overheats
Engine knocks
SUPER8 50 2T
Probable Cause
Clogged air cleaner
Clogged fuel filter
Clogged exhaust muffler
Faulty auto bystarter
Faulty charcoal canister
Faulty CDI unit
Faulty A.C. generator
Worn cylinder and piston
rings
Blown cylinder head gasket
Faulty reed valve
Clogged carburetor jets
Fouled spark plug
Incorrect heat range plug
Mixture too lean
Poor quality fuel
Excessive carbon build-up
in combustion chamber
Ignition timing too early
Excessive carbon build-up
in combustion chamber
Poor quality fuel
Clutch slipping
Mixture too lean
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