[stevied645]

hi guys i just bought another kx250 98 model today and ripped the engine apart to have it rebuilt (with the correct crank seals this time lol) how much play is allowed in the bearing at end of conrod (the big one) there is very slight sideways movement but none up and down that i can feel

 

[FPMXer]

My service manual says side clearance standard is 0.45 - 0.55 mm and the service limit is 0.70 mm. No up and down movement is crucial to a sound bottom end.

 

[stevied645]

lol any ideas how to measure that

 

[KickassKX125]

A micrometer, any good engineering shop will have or eBay: eBay.co.uk - digital micrometer, micrometer, digital vernier, Industrial Tools items at low prices

 

[griffbones]

You measure the side play with a feeler gauges. Pull the rod to one side and see how much space is in the gap, then check the other side. The two sides should measure the same.
Side play is normal and should be there as FPMXer has stated and given the spec for, and as he already stated there should be no up and down (radial) play at all.

This can't be measured with a vernier caliper or outside micrometer.