Can I bore a 01' RM 125 cylinder?

Can I bore a 01' RM 125 cylinder?


I bought this bike it had no compression, I tore it down, half of the middle O ring on the head was missing. So I'm guessing coolant leaked off into the cylinder it over heated and caused cylinder scaring. I mic'd the piston at it looks to be 1mm over sized. This baffles me because I thought the cylinders on most of the newer bikes could not be bored. I just want to know before I take the jug to get it bored and buy a matching piston.

Please help, I finally got my yz up and going for me and now I have a ktm that has no power and a blown up rm. I need a running dirtbike from my little brother. No one will help me on the ktm so here I am looking for help on the rm.

Thanks for your time

dk

come on guys please help.

I think the std bore is 54mm although the piston that I pulled out was 55mm

Thanks for your reply man. I did not know the magnet trick and I will try that when I get back to the shop.

I'm curious why people have us chrome to replate the cylinders. I think the last time I checked they were more expensive to replate than it was to just re sleeve it. Please correct me if I am wrong and I will look into pricing more.

Thanks again for your time
dk