Crankcase/Crankshaft/Transmission/Balancer Troubleshooting; Excessive Noise; Transmission Jumps Out Of Gear; Hard To Shift - Honda 2010 CRF250R Service Manual

CRANKCASE/CRANKSHAFTITRANSMISSION/BALANCER
TROUBLESHOOTING
Excessive noise
Worn crankshaft bearings
Worn or damaged connecting rod big end bearing
Worn connecting rod small end (page 9-7)
Worn balancer shaft bearings
Improper balancer installation
Worn, seized or chipped transmission gear
Worn or damaged transmission bearing
Incorrect valve adjustment (page 3-12)
Sticking valve or broken valve spring (page 8-21)
Worn or damaged camshaft (page 8-12)
Worn or damaged valve lifter (page 8-21)
Worn or loose cam chain
Worn or damaged cam chain tensioner (page 8-35)
Worn cam sprocket teeth (page 8-12)
Faulty cylinder. piston or piston rings (page 9-5)
Transmission jumps out of gear
Worn gear dogs
Worn gear shifter groove
Bent shift fork shaft
Broken gearshift drum stopper arm (page 10-20)
Broken gearshift drum stopper arm spring (page 10-20)
Loose gearshift drum stopper arm bolt (page 10-20)
Worn or bent shift forks
Weak or broken gearshift spindle return spring
Hard to shift
Improper clutch lever freeplay adjustment (page 3-26)
Incorrect transmission oil viscosity (page 3-16)
Bent shift fork
Bent shift fork shaft
Bent shift fon.: claw
Damaged gearshift drum guide grooves
Damaged gearshift spindle (page 10-20)
Damaged gearshift drum stopper arm and pin (page 10-20)
Loose gearshift drum stopper arm bolt (page 10-20)
Bent shift spindle
Engine vibration
Excessive crankshaft runout
• Improper balancer liming
12-6