I see that weisco now makes a 686 raptor piston, which is 2 overbore. I want to know if i can go this much on a stock sleeve, or if i need another one pressed in. Also, with that piston, and a stage one hotcam, will i have to rejet? thanks. oh, and what are some power estimates?

 

What are you running now, 100.5mm? You might get away without jetting, but it will probably take a tweak or two.

Since your cam and compression arent changing, hp increase will be minimal, but you will get a boost.

 

sorry, my sig is my old bike. i have a stock engine'd 02' now. IS it safe to go to a 686 on a stock piston.

 

its safe i do them all the time

 

oh yeah, i mean to say, the sleeve wont be too thin if i go 2 over?

 

102mm (686 cc) is the max bore on a stock raptor sleeve. It's no problem go for it.

If you wear that cylinder out later, complete used cylinders are selling on ebay for about $100.

Been there done that.