KYMCO Mongoose 50-2T User Manual

1. GENERAL INFORMATION
1-29
ENGINE LACKS POWER
Clogged air cleaner
Restricted fuel flow
Clogged fuel tank cap breather hole
Clogged exhaust muffler
Carburetor fuel level too low
Faulty ignition unit
Faulty pulser coil
Improper valve clearance
adjustment
Excessively worn valve seat
(protruded valve stem)
Improper valve and seat contact
Worn cylinder and piston rings
Leaking cylinder head gasket
Improper valve timing
Clean and unclog
Fouled spark plug
Incorrect heat range plug
Oil level too high
Oil level too low
Oil not changed
Clogged oil line
Faulty oil pump
Worn cylinder and piston rings
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
Ignition timing too early
Start engine and
accelerate lightly for
observation
Inspection/Adjustment
Symptom
Probable Cause
Engine speed
increases
Correct timin
g
Engine speed does no
t
increase sufficientl
y
Incorrect timin
g
Check ignition timing
(using a timing light)
Test cylinder compression
Check carburetor fo
r
clogging
Rapidly accelerate or run
at high speed
Remove spark plug and
inspect
Check if engine overheats
Check valve clearance
Correc
t
Incorrec
t
N
ormal
com
p
ression
Abnormal
compression
Remove oil dipstick and
check oil level and condition
Remove cylinder head oil
p
i
p
e bolt and ins
p
ec
t
Engine overheats
Engine does no
t
overheats
Plug not fouled o
r
discolored
Plug fouled o
r
discolored
Correct and no
t
contaminated
Incorrect o
r
contaminated
Valve train lubricated
p
ro
p
erl
y
Valve train no
t
lubricated
p
ro
p
erl
y
Engine does not knock
Engine knocks
Not clo
gg
ed
Clo
gg
ed

KYMCO Mongoose 50-2T Specifications

General

Brand	KYMCO
Model	Mongoose 50-2T
Category	Offroad Vehicle
Language	English