250x rebuild questions

[willjoe86]

Hello- Im in the process of rebulding my 250x and im wondering how i can tell if the cylinder has been bored out or not? How can I tell how much it was bored over, if so?
The piston in there now has 0.50 mm written on it-i dont know if this is anything.
thanks
Will

[swamprider7]

I am not certain, but I believe that .50mm means .50mm overbore from stock. I used a bore guage on my warrior to check the bore size when I rebuilt it. Take your cylinder to a local mechanic, I am sure they will have one.

[willjoe86]

thanks a lot swamprider
Also, anyone know how much the cylinder can be bored out before becoming too thin to be used?
anyone else have any ideas?
thanks
Will

[wilkin250r]

More important than wall thickness is the question, how many oversized pistons can I get?

It may be possible to overbore it 0.140 over without busting through the wall, but if you can only find a piston for 0.120 over, then that is your limit.:ermm: