Engine General Information and Diagnosis: 1A-11
Engine runs poorly in
high speed range
(Defective control circuit
or sensor)
Low fuel pressure. Repair or replace.
Defective TP sensor. Replace.
Defective IAT sensors. Replace.
Defective CMP sensor. Replace.
Defective CKP sensor. Replace.
Defective GP sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
TP sensor out of adjustment. Adjust.
Defective STP sensor and/or STVA. Replace.
Defective EXCVA. Replace.
Engine lacks power
(Defective engine internal/
electrical parts)
Loss of valve clearance. Adjust.
Weakened valve spring. Replace.
Valve timing out of adjustment. Adjust.
Worn piston ring or cylinder. Replace.
Poor seating of valve. Repair.
Fouled spark plug. Clean or replace.
Incorrect spark plug. Adjust or replace.
Clogged fuel injector. Replace.
Defective secondary fuel injector. Replace.
TP sensor out of adjustment. Adjust.
Clogged air cleaner element. Replace.
Imbalancing throttle valve
synchronization.
Adjust.
Sucking air from throttle valve or
vacuum hose.
Retighten or replace.
Too much engine oil. Drain out excess oil.
Defective fuel pump or ECM. Replace.
Defective CKP sensor and ignition coil. Replace.
Defective STP sensor or STVA. Replace.
Engine lacks power
(Defective control circuit
or sensor)
Low fuel pressure. Repair or replace.
Defective TP sensor. Replace.
Defective IAT sensor. Replace.
Defective CKP sensor. Replace.
Defective GP switch. Replace.
Defective IAP sensor. Replace.
Defective AP sensor. Replace.
TP sensor out of adjustment. Adjust.
Defective STP sensor and/or STVA. Replace.
Defective EXCVA. Replace.
Engine overheats
(Defective engine internal
parts)
Heavy carbon deposit on piston crown. Clean.
Not enough oil in the engine. Add oil.
Defective oil pump or clogged oil circuit. Replace or clean.
Sucking air from intake pipe. Retighten or replace.
Use of incorrect engine oil. Change.
Defective cooling system. See radiator section.
Engine overheats (Lean
fuel/air mixture)
Short-circuited IAP sensor/lead wire. Repair or replace.
Short-circuited IAT sensor/lead wire. Repair or replace.
Sucking air from intake pipe joint.
Repair or replace.
D
e
fective fuel injector. Replace.
Defective ECT sensor. Replace.
Engine overheats (Other
factors)
Ignition timing is too advanced due to
defective timing advance system (ECT
sensor, GP switch, CKP sensor or
ECM).
Replace.
Too tight drive chain. Adjust.
ISC incorrect learning. Reset learned value.
Condition Possible cause Correction / Reference Item
Manuals by Motomatrix / The Solution For Lost Motorcycle Coded Keys
email: info@motomatrix.co.uk / www.motomatrix.co.uk
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