Skip to main content

YPVS Controller Modification - An extra exhaust curve for TZ250L.

I've been working on some YPVS controllers for Pete(GB), Gavin(GB) and LES(CA) and I just found out a new exhaust valve curve that I want to share.

Pete owns a Tz250H converted to an L (electronic power valve). I have a few TZ250 (mostly reverse twins) exhaust valve curves on the blog but the below one is new to me.


  1. Looks like they were trying to scavenge a bit more lower down by closing the exhaust port 39 degrees then logically starting to open it a bit earlier at 4352 rpm.
    Fully open at 7936 rpm, so should be on the pipe by then.


Post a Comment