Piston Pin; Crankshaft Bearing - Yamaha XT550J Service Manual

Piston pin
1. Lightly oil the piston pin, and install it in
the small end of the connecting rod.
2. Check the free play. There should be no
noticeable vertical play. If any free play
exists, check the connecting rod for
wear. Replace the pin and connecting
rod as required.
3. Insert the piston pin in the piston, and
check the free play. There should be no
noticeable fee play when the pin is in
place in the piston. If the piston pin is
loose, replace the pin and/or the piston
as required.
H. Crankshaft and Connecting Rod
Crankshaft bearing
1. Bearings should be cleaned, dried, and
the races visually checked for pits, rust
spots, or chatter marks where the balls
have dragged. If any of these conditions
exist, the bearings should be replaced.
NOTE: ______________________ __
Lubricate the bearings immediately after ex-
amining them to prevent rust.
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