willardwright59 Posted August 2, 2012 Report Posted August 2, 2012 i think redline does that piston mod? Quote
Paulie B Posted August 2, 2012 Report Posted August 2, 2012 (edited) I see. So I wonder why wiseco cut such a big window? They should have known better?? A builder did the cutting. He didn't know any better not having any experience with a YZ400. He's a friend and this was years ago all has been forgivin. A lil background on the motor is the intake on the jug has no bridge- it just a huge gaping hole. In hind site it would have been better to have cut 2 windows in the piston leaving a bridge for strength. I'm also to blame because I was running it on meth so rich it was probably washing down the oil hence the extreme scaring on the intake side. Live and learn I guess. I consider myself lucky for getting to in time before the skirt let go... Edited August 2, 2012 by Paulie B Quote
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