9.TROUBLESHOOTING
9-5
3. Check tightening torque of cylinder head screws.
Screws not properly tightened. Retighten screws to recommended
torque and replace oil.
4. Check oil for particles (may indicate possible engine internal damages).
Oil contamination due to metal or plastic particles. Replace possibly
damaged part(s) including oil and oil filter. Use recommended oil (refer
to technical specifications).
CYLINDER AND HEAD
Symptom: UNUSUAL ENGINE NOISE AND/OR VIBRATION
1. Check noise coming from cylinder head area.
Improper valve clearance adjustment. Readjust valve clearance and/or
replace defective part(s).
Faulty chain tensioner. Replace spring and/or mechanism.
Chain guide worn out. Replace chain guide.
Stretched chain and/or worn out sprockets. Replace chain and sprockets.
Sprocket screws got loose. Retighten screws with recommended torque.
Rocker arm(s) is (are) worn out (valve adjustment). Readjust valve
clearance and/or replace rocker arm(s).
Incorrect camshaft timing adjustment. Replace damaged components
and readjust camshaft timing (refer to cylinder and head).
Symptom: OIL CONTANMINATION ON CYLINDER AND/OR HEAD
1. Check screws for torque.
Loose screws. Retighten screws with recommended torque.
Gaskets are brittle, hard, worn out or otherwise damaged. Replace
damaged gaskets, O-rings or the V-ring on breather.
CRANKSHAFT
Symptom: UNUSUAL ENGINE NOISE AND/OR VIBRATION
1. Check noise coming from crankshaft area..
Crankshaft plain bearings are damaged,. Replace crankshaft plain
bearings.
Connecting rod plain bearings are damaged. Replace connecting rod
plain bearings.
Magneto rotor got loose. Replace damaged components and retighten
rotor retaining screw with recommended torque (refer to MAGNETO
SYSTEM).
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