tri-z engine question..

[TrailerRider]

What is a YPVS motor? High pro topend? Some kind of power valve?

http://c4.ac-images.myspacecdn.com/images02/9/l_4939992b732a4493aca0fa89a8d7a263.jpg

[tecat-z]

Yes, power valve engine. That is a 82 engine, which is a one year design from many standpoints.

[Yamaha_Rules69]

YPVS stands for Yamaha Power Valve System. I guess they have a little more radical porting, and the powerband is not so much like a "lightswitch" which is what the power valve is designed to do, give you more smoothe power everywhere. I dont think the original tri z motor is too bad, and not like a lightswitch like my tecate.