Why? 8250 is the power peak on the 580 motor. If you are determined to do it, I'd start with a the 10-al, and lighten them up if need be. A T-1 helix worked good on those for the intial over rev you mention.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Hardcore Sledder
8.8M posts
150.6K members
Since 2002
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, trails, riding tips, modifications, classifieds, accessories, troubleshooting, maintenance, and more!