Yamaha 200, 225, 250 OX66 motors

[photocycle]

I noticed the OX66 generation motors all share the 3.1 litre motor (200, 225, 250). So what exactly is mechanically different between all of them if they are the same size? It's got to be easy to do a quick mod to unleash more HP.... ?

Or maybe the 3.1L means something else besides engine size...

(I'm not mechanically incline so pardon my curiosity)

[Mat_HT]

Biggest difference between the 3 is the heads and ecu (and porting on the 250). But you could bolt a set of stock 250 heads - or our Rec heads on a 200 and really wake it up.

[photocycle]

^haha.. NICE!

Thanks for the reply.