im doing a top end rebuild on my 350 bruin an was wanting to replace the piston as well i have been looking everywhere online for a piston kit for the bike but can not find one... but i did find one for a big bear 350 and i was just wondering if that would also work for the bruin? Or if anyone knows where i could find a good piston for the bruin?

thanks!

 

You can get oem pretty easy. I found standard and oversize at RMATVMC in stock. Likely pretty much anyplace with an oem microfiche will have them in stock or easily available. If you are looking to build it up I would contact a few engine buillders and see what they have/can do. I know Mickey Dunlap has kits for Yamaha 350's. Not sure if the Bruin is close enough to the other models he has though.

 

Your question is why you need to call Mickey (Mickey Dunlaps four stroke tech).
He can advise and I'm sure he can supply you the correct parts that you need.