IMI Gearing for Rotax Jr

[Joe Rosse]

We’re hoping to get in our first race at IMI this weekend, but won’t have much time to do set-up. Can anyone offer a starting point on gearing for a Rotax Jr?

[Michael Hurley]

Yea, and how about rotax masters? You know us old fat guys need to know what gear to run as well. Maybe Dane and Duff can help. :cheers:

[Mike Jansen]

12/74 for the geezer class should start you right. Try it from there.

[Michael Hurley]

12/74….ok thanks. What about for a 13 drive gear?

[Jeff Welch]

13/80 is close to 12/74. You do run a higher risk of breaking the sprocket on the ground by running the larger 80 tooth gear. You’d probably be fine though.

[Doug Welch]

Try something in the 13/80 range. We run 13/76-77 in the senior class. We are now stocking the kevlar sprockets.

[Joe Rosse]

For those of you who don’t know Mike, he’s trying to pull the wool over your eyes with references to being a geezer or a fat guy! If I was still running Masters, I’d probably tell him to run 13:70 just to give the real geezers a chance! :cheers:

[Michael Hurley]

Come on Joe. I’m a new guy to IMI. I am over 40 years old and have a body wieght of 210 so………. don’t I qualify for the fat geezer class?
:cheers:

[Michael Hurley]

Joe did start this thred needing help with picking the gear for a jr. rotax. Can any body help? Sorry Joe. :check

[Mike Jansen]

Hey! I am over 40 (ouch) but weigh 205 (6’4″)(chicken and tuna are my best friends and what’s dessert?) :bs: be gentle!

Call Stacy in Grand Junction since they have a few Rotax jr’s running there. That’s the best advice I can give.

Looking forward to seeing you all at the track this weekend. Last time I ran with the Sr’s I got my arse handed to me @ GJ 😥 I’ll leave them to Jack Warrington…

[Superslow]

A rotax junior should be about four or five teeth less than a senior, so start on a 13/75 or so…..

[Author]

Posts