Two Stroke Motocross

Two Stroke Motocross Forum => Technical => Topic started by: jordan83 on February 23, 2010, 04:33:07 PM

Title: 03 yz250. top end rebuild
Post by: jordan83 on February 23, 2010, 04:33:07 PM

blew the base gasket out of my 03 yz250. while its apart im gona go ahead and throw new piston and rings in. my question is after i took the cylinder off i found that my rod has some back and forth  play at the crank bearing. no up and down play. is the side to side play normal? Thanks

Title: Re: 03 yz250. top end rebuild
Post by: Chokey on February 23, 2010, 04:41:56 PM

Some side-to-side play is normal. The manual will give you the allowable runout specs for the big-end rod bearing.

Title: Re: 03 yz250. top end rebuild
Post by: jordan83 on February 23, 2010, 04:46:37 PM

but can you check the specs without taking the crank out?

Title: Re: 03 yz250. top end rebuild
Post by: jordan83 on February 23, 2010, 06:06:56 PM

alrite. i got the specs for everything. now how do i go about measuring the freeplay? if im even using the right term (side to side play).  thanks

Title: Re: 03 yz250. top end rebuild
Post by: TotalNZ on February 24, 2010, 12:51:24 AM

you use a feeler gauge. You want to get yourself a workshop manual, it'll tell you everything you need in detailed steps.