Part IV Faults Diagnosis
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4-8 Abnormal noises of engine
(Adjust valve clearance and replace worn parts)
(Check and adjust carburetor)
(Refer to Section 3-5)
(Refer to Section 4-7)
(Remove carbon deposition)
(Replace piston ring)
(Replace worn parts)
(Replace piston and piston ring)
Abnormal
noises of engine
Rattle
Detonation with
metallic sound
Wear of connecting-rod, piston pin and pin hole
Wear of piston and piston ring
Excessive carbon deposition in combustor
Clearance of spark plug electrode too small
Serious fuel rich of engine
Improper adjustment of valve clearance/wear of
relevant parts
Other abnormal
noises
(Replace connecting parts and re-install)
Loose connection between flywheel and crankshaft
Wear of crankshaft bearing
(Replace fuel)
(Replace bearing)
Bearing wear inside crankcase
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