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1. GENERAL INFORMATION QUANNON 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
increases increase sufficiently hole
Clogged exhaust muffler
Carburetor fuel level too low
Clogged carburetor high speed
Check ignition timing fuel passage
using a timing light
Correct Incorrect Faulty CDI unit
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 Abnormal Worn cylinder and piston rings
compression 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
Correct and not Incorrect or Oil level too high
contaminated contaminated Oil level too low
Oil not changed
Remove cylinder head oil
pipe bolt and inspect
Valve train Valve train not Clogged oil cooler
lubricated properly lubricated properly Clogged oil line
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
Rapidly accelerate or run Ignition timing too advanced
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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