Honda CRF450R 2007 Service Manual

CYLINDER/PISTON
TROUBLESHOOTING
• Engine top-end problems usually affect engine performance. These problems can be diagnosed by a comp ression test
or by tracing engine noise to the top-end with a sounding rod stethoscope.
• If the performance is poor at low speeds, check for white smoke in the crankcase breather hose. If the hose is smoky,
check for a seized piston ring.
Compression too low, hard starting or poor performance at l ow speeds
• Leaking cylinder head gasket
• Worn, stuck or broken piston rings
• Worn or damaged cylinder and piston
• Loose spark plug
Co mpr ession too high, ove r .heat in g or knocking
• Excessive carbon build-up in cylinder head or on top of piston
Abnormal noise
• Worn cylinder and piston
• Worn piston pin or piston pin hole
•
Worn connecting rod small end
• Worn connecting rod big end
Excessive s mok e
• Worn cylinder, piston and piston rings
• Improper installation of piston rings
• Scored or scratched piston or cylinder wall
10-4

Honda CRF450R 2007 Specifications

General

Brand	Honda
Model	CRF450R 2007
Category	Motorcycle
Language	English