KYMCO ZX/SCOUT 50, Service Manual

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2
. GENERAL INFORMATION
2-19
ZX / SCOUT
ENGINE LACKS POWER
c
Clogged air cleaner
d
Clogged fuel filter
e
Clogged exhaust muffler
f
Faulty auto bystarter
c
Faulty CDI unit
d
Faulty A.C. generator
c
Worn cylinder and piston
rings
d
Blown cylinder head gasket
e
Faulty reed valve
c
Clogged carburetor jets
c
Fouled spark plug
d
Incorrect heat range plug
c
Mixture too lean
d
Poor quality fuel
e
Excessive carbon build-up in
combustion chamber
f
Ignition timing too early
c
Excessive carbon build-up in
combustion chamber
d
Poor quality fuel
e
Clutch slipping
f
Mixture too lean
Inspection/Adjustment Symptom
Engine speed
increases
Engine overheats
Correct timing
Engine does not
knock
Plug not fouled or
discolored
Normal
compression
Not Clogged
Engine speed
does
not increase
ffi i tl
Engine does not
overheats
Incorrect timing
Engine knocks
Plug fouled or
discolored
Abnormal
compression
Clogged
Start engine and
accelerate lightly for
observation.
Rapidly accelerate or
run at high speed
Test cylinder
compression (using a
compression gauge)
Check carburetor for
clogging
Check if engine
overheats
Remove spark plug and
inspect
Check ignition timing
(using a timing light).
Probable Cause