Hello everyone is me again.
I was looking through my NAC's catalog and I came uppon a kit that the sell to get more volume in the crank of a 250r.
I think they sell you a spacer plater for the cylinder and you need to get a CR or 86trx style piston.
My question is if someone here has done that? and did it give more power to his/her TRX.

 

This mod makes more top end power but you sacrifice alot of bottom end, it does not work that well.Just go with a nice port job, e-mail me if you want more info.