Inspection/Adjustment - KYMCO People Service Manual

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
1-23
Symptom
Engine speed does
Engine speed
not increase
increases
sufficiently
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
cClogged air cleaner
dRestricted fuel flow
eClogged fuel line between fuel
fClogged exhaust muffler
gFaulty auto bystarter
hSplit carburetor vacuum piston
cFaulty ignition unit
Incorrect timing
dFaulty A.C. generator
cImproper valve clearance
Incorrect
dWorn valve seat (valve stem
cImproper valve and seat
Abnormal
dWorn cylinder and piston rings
compression
eBlown cylinder head gasket
fFlaws in cylinder head
gImproper valve timing
Clogged cClogged carburetor jets
Plug fouled or
cFouled spark plug
discolored dIncorrect heat range plug
cOil level too high
Incorrect or
dOil level too low
contaminated
eOil not changed
Valve train not cClogged oil pipe
lubricated properly dFaulty oil pump
cInsufficient coolant
dFaulty thermostat
eWorn cylinder and piston rings
fMixture too lean
gPoor quality fuel
Engine overheats
hExcessive carbon buildup in
iIgnition timing too early
jAir in cooling system
cExcessive carbon build-up in
dPoor quality fuel
Engine knocks
eClutch slipping
fMixture too lean
g Ignition timing too early
PEOPLE/PEOPLE S 250
Probable Cause
tank and carburetor
diaphragm
adjustment
too protruding
contact
combustion chamber
combustion chamber