I know I can bore the re-sleeved 809 out to a 975, but heard better luck just boreing to 925 on the larger sleeves. My question is, with the exeption of the aftermarket cylinders, are there any stock Rotax cylinders that would "bolt" on the triple case for going to a larger bore? I know most of the older bigger bore cylinders were RV engines and all the new ones are cylinder reed, but I'm just curious if anyone else has thought of it or tryed it. I just like the idea of a 670 rod on the stock triple stroked crank and bigger pistons.

 Sounds very interesting!! Do you have any contact info for him?

 

KBK wrote:

I know Dan Hull of A&S racing had a pro stock 1000 with a machZ case and three 670 cylinders.Don't know how hard it was to fit them to it but it can be done.

dan solds that motor to ron mcburney  i know dave at stealyh performance built one like that also i think he still has it   dave  stealth performance  715 479 3540

  Splitt second performance builds these motors and they work very well. Jaimie Hogg from out west runs one of these units on his o/m 1000 and it is very fast.