Honda CBR650F Service Manual page 255

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CRANKSHAFT/PISTON/CYLINDER
SERVICE INFORMATION
CRANKSHAFT/PISTON/CYLINDER
GENERAL
• The crankcase must be separated to service the crankshaft, cylinder, piston/connecting rod and piston oil jet. Refer to
procedures for crankcase separation (page 13-4).
• Mark and store the connecting rods, bearing caps and bearing inserts to be sure of their correct locations for reassembly.
• The crankpin and main journal bearing inserts are select fit and are identified by color codes. Select replacement bearings from
the code tables. After selecting new bearings, recheck the oil clearance with a plastigauge. Incorrect oil clearance can cause
major engine damage.
TROUBLESHOOTING
Cylinder compression is too low, hard to starting or poor performance at low speed
• Leaking cylinder head gasket
• Worn, stuck or broken piston ring
• Worn or damaged cylinder and piston
Cylinder compression too high, overheating or knocking
• Excessive carbon built-up on piston head or combustion chamber
Excessive smoke
• Worn cylinder, piston or piston ring
• Improper installation of piston rings
• Scored or scratched piston or cylinder wall
Abnormal noise
• Worn piston pin or piston pin hole
• Worn connecting rod small end
• Worn cylinder, piston or piston rings
• Worn main journal bearings
• Worn crankpin bearings
Engine vibration
• Excessive crankshaft runout
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