KYMCO DINK 200i Service Manual page 46

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
1-43
Symptom
Engine speed
increases
Correct timing
Correct
Normal
compression
Not Clogged
Plug not fouled or
discolored
Correct and not
contaminated
Valve train
lubricated properly
Engine does not
overheats
Engine does not knock
Engine speed does
not increase
sufficiently
Incorrect timing
Incorrect
Abnormal
compression
Clogged
Plug fouled or
discolored
Incorrect or
contaminated
Valve train not
lubricated properly
Engine overheats
Engine knocks
DINK200i/125
Probable Cause
cClogged air cleaner
dRestricted fuel flow
eClogged fuel line between fuel
tank and carburetor
fClogged exhaust muffler
gFaulty auto bystarter
hSplit carburetor vacuum piston
diaphragm
cFaulty ignition unit
dFaulty A.C. generator
cImproper valve clearance
adjustment
dWorn valve seat (valve stem too
protruding
cImproper valve and seat contact
dWorn cylinder and piston rings
eBlown cylinder head gasket
fFlaws in cylinder head
gImproper valve timing
cClogged carburetor jets
cFouled spark plug
dIncorrect heat range plug
cOil level too high
dOil level too low
eOil not changed
cClogged oil pipe
dFaulty oil pump
cInsufficient coolant
dFaulty thermostat
eWorn cylinder and piston rings
fMixture too lean
gPoor quality fuel
hExcessive carbon buildup in
combustion chamber
iIgnition timing too early
jAir in cooling system
cExcessive carbon build-up in
combustion chamber
dPoor quality fuel
eClutch slipping
fMixture too lean
g Ignition timing too early