KYMCO Bet & Win 250 Manual page 19

1
. GENERAL INFORMATION
ENGINE LACKS POWER
Inspection/Adjustment
Start engine and accelerate
lightly for observation
Check ignition timing
(using a timing light)
Check valve clearance
Test cylinder compression
Check carburetor for
clogging
Remove spark plug and
inspect
Remove oil dipstick and
check oil level and condition
Remove cylinder head oil
pipe bolt and inspect
Check if engine overheats
Rapidly accelerate or run
at high speed
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Symptom
Engine speed
increases
Correct timing
Correct
Normal
compression
Not Clogged
Plug not fouled or
discolored
Correct and not
contaminated
Valve train lubricated Valve train not
properly lubricated properly
Engine does not
overheats
Engine does not knock
ÅClogged air cleaner
ÇRestricted fuel flow
ÉClogged fuel line between fuel
Engine speed does
ÑClogged exhaust muffler
not increase
ÖFaulty auto bystarter
sufficiently
ÜSplit carburetor vacuum piston
ÅFaulty CDI unit
Incorrect timing
ÇFaulty A.C. generator
ÅImproper valve clearance
Incorrect
ÇWorn valve seat (valve stem too
ÅImproper valve and seat contact
ÇWorn cylinder and piston rings
Abnormal
ÉBlown cylinder head gasket
compression
ÑFlaws in cylinder head
ÖImproper valve timing
Clogged
ÅClogged carburetor jets
Plug fouled or
ÅFouled spark plug
discolored
ÇIncorrect heat range plug
ÅOil level too high
Incorrect or
ÇOil level too low
contaminated
ÉOil not changed
ÅClogged oil pipe
ÇFaulty oil pump
ÅInsufficient coolant
ÇFaulty thermostat
ÉWorn cylinder and piston rings
ÑMixture too lean
ÖPoor quality fuel
Engine overheats
ÜExcessive carbon buildup in
áIgnition timing too early
àAir in cooling system
ÅExcessive carbon build-up in
ÇPoor quality fuel
Engine knocks
ÉClutch slipping
ÑMixture too lean
Ö Ignition timing too early
Bet & Win 250
Probable Cause
tank and carburetor
diaphragm
adjustment
protruding
combustion chamber
combustion chamber
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