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1. GENERAL INFORMATION Pulsar CK 125
POOR PERFORMANCE (ENGINE LACKS POWER)
Inspection/Adjustment Symptom Probable Cause
Start engine and accelerate
lightly for observation
Clogged air cleaner
Poor fuel flow (Restricted)
Engine speed Engine speed does not Clogged fuel tank cap breather hole
increases increase sufficiently Clogged exhaust muffler
Carburetor fuel level too low
Clogged carburetor high speed fuel
Check ignition timing passage
using a timing light
Faulty CDI unit
Correct Incorrect Faulty pulser coil
Check valve clearance
Improper valve clearance
Correct Incorrect adjustment
Excessively worn valve seat
(protruded valve stem)
Test cylinder compression
Improper valve and seat contact
Normal Low compression Worn cylinder and piston rings
compression Leaking cylinder head gasket
Improper valve timing
Check carburetor for
clogging
Not clogged Clogged Clean and unclog
Remove spark plug and
inspect
Plug not fouled or Plug fouled or Fouled spark plug
discolored discolored Incorrect heat range plug
Check crankcase for oil
level and condition
Incorrect or Oil level too high
Correct and not Oil level too low
contaminated contaminated
Oil not changed
Check cylinder head for
oil lubrication
Valve train lubricated Valve train not Clogged oil line
properly lubricated properly Faulty oil pump
Check for engine overheating
Worn cylinder and piston rings
Mixture too lean
Engine does not Engine overheats Poor quality fuel
overheats Excessive carbon buildup in
combustion chamber
Ignition timing too advanced
Rapidly accelerate or run
at high speed
Excessive carbon build-up in
combustion chamber
Engine does not knock Engine knocks Poor quality fuel
Clutch slipping
Mixture too lean
Ignition timing too advanced
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