Yz250 help please!

Hi everyone,

I'm redoing a topend on my 1986 yz250. I was wondering if the cylinder is sleeved. It appears to be but no matter where i search online I cannot seem to find one for sale and the yamaha parts diagram does not seem to show one either. Is it actually sleeved? I need the help of someone that has done work on these old bikes before. Thanks

 

Hope I can help.  Yes they have a sleeve in them.  They have to.  It might be nick. plated tho.  What is wrong with your jug?

Ok thanks. I can't seem to find one for sale anywhere though. Some how the piston ended up with a very large dinge in it and the cylinder is badly scarred as well. I honed the cylinder but the scarring is still very evident.

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