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1. GENERAL INFORMATION AGILITY 125
ENGINE LACKS POWER
Inspection/Adjustment Symptom Probable Cause
Start engine and accelerate
lightly for observation Clogged air cleaner
Poor quality fuel (Restricted)
Clogged fuel tank cap breather hole
Engine speed Engine speed does not Clogged exhaust muffler
increases increase sufficiently Faulty auto bystarter
Split carburetor vacuum piston
Check ignition timing diaphragm
using a timing light Faulty auto fuel valve
Faulty CDI unit
Correct timing Incorrect timing Faulty pulser coil
Check valve clearance
Improper valve clearance
Correct Incorrect adjustment
Worn valve seat (valve stem too
protruding
Test cylinder compression
Improper valve and seat contact
Normal Abnormal Worn cylinder and piston rings
compression compression Leaking cylinder head gasket
Improper valve timing
Check carburetor for
clogging
Not clogged Clogged Clogged carburetor jets
Remove spark plug and
inspect
Plug not fouled or Plug fouled or Fouled spark plug
discolored discolored Incorrect heat range plug
Remove oil dipstick and
check oil level and condition
Incorrect or Oil level too high
Correct and not Oil level too low
contaminated contaminated
Oil not changed
Remove cylinder head oil
pipe bolt and inspect
Valve train not Clogged oil pipe
Valve train lubricated
properly lubricated properly Faulty oil pump
Check if engine overheats
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 early
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 early
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