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2014-05-03 13:00:00 GMT+00:00
Jax gearing
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Daniel White



Joined: 05 Jun 2007
Posts: 466
Score: 5767
Location: Atlanta

PostPosted: Mon Apr 06, 2009 6:21 pm    Post subject: Jax gearing Reply with quote

Anyone know what gear to use in Rotax Masters . . . with an 11 tooth driver? Thanks.
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Tonykart EVRR / Adkins Yamaha
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John Wehrheim
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Joined: 18 May 2006
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PostPosted: Mon Apr 06, 2009 6:39 pm    Post subject: Reply with quote

My guess would be 6-7 teeth smaller than Barnesville.
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Ihor Bilyy
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Joined: 10 Apr 2006
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Location: Canton, GA

PostPosted: Mon Apr 06, 2009 7:41 pm    Post subject: Reply with quote

Use 13t engine gear with 78t sprocket (Senior). Straight is everything.
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John Wehrheim
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Joined: 18 May 2006
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Location: Norcross

PostPosted: Mon Apr 06, 2009 8:32 pm    Post subject: Reply with quote

Actually the Monza is everything. The straight is the result of the Monza.
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Rick



Joined: 29 Nov 2006
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Location: Stockbridge, Ga.

PostPosted: Tue Apr 07, 2009 7:05 am    Post subject: Reply with quote

Ihor Bilyy wrote:
Use 13t engine gear with 78t sprocket (Senior). Straight is everything.

Will 12/74 work? Horseshoe is everything. Smile
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Patrick French



Joined: 28 Feb 2007
Posts: 193
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Location: Covington, GA

PostPosted: Tue Apr 07, 2009 7:11 am    Post subject: Reply with quote

Is there a reason to not run a 12t pinion gear? Assuming I can get 72-75t sprockets, they have the same ratio as the 13/78..... Is there less resistance using a larger front gear, or is there another reason to get the 13t front driver? Obviously I have to buy one or the other! Confused
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Ihor Bilyy
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Joined: 10 Apr 2006
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Location: Canton, GA

PostPosted: Tue Apr 07, 2009 7:25 am    Post subject: Reply with quote

13/82 will work for us Smile
Its a pain to see/hear MiniMax using spec gear in Jacksonville.
As for the free to change gearing classes, I'm telling personal experience. I was using 12/79, changed to 12/77 and was still at 14000 (senior weight). Chris was there twice and competitive in TaG class, he knows more.
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Daniel White



Joined: 05 Jun 2007
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Location: Atlanta

PostPosted: Tue Apr 07, 2009 1:09 pm    Post subject: Reply with quote

So I definitely must change back to my 12-tooth driver? I can't go 11/70-something? Sorry for the ignorance--this will be my first time on a different track.

If I must change to a 12, it seems like a 77 or 78 will work for masters, yes? (I have these gears on hand.)
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Patrick French



Joined: 28 Feb 2007
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Location: Covington, GA

PostPosted: Tue Apr 07, 2009 1:40 pm    Post subject: Reply with quote

Daniel, if the ratio at 13/78 is correct, it correlates to either a 12/72 or an 11/66. A 13/81 (I would assume that my big ole butt would need a few more teeth) correlates with 12/75 and 11/69. These numbers are just off a gear ratio sheet, and I don't know what to do, either, yet... I am still just trying to figure if it is better to change the rear sprocket, or will a larger driver do a better job? However, if you really don't want to change from the 11T driver, you need some REALLY small rear sprockets!
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Daniel White



Joined: 05 Jun 2007
Posts: 466
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Location: Atlanta

PostPosted: Tue Apr 07, 2009 2:29 pm    Post subject: Reply with quote

Patrick, you know how proficient I am with tools . . . just wanted to avoid fouling something up.

Before the next race, I'm going to, for the FIRST time:

1) rebuild my carburetor
2) rebuild my fuel pump
3) change my exhaust packing

I also need to change the exhaust gasket--it's spewing a bit of fluid on my motor. And change my tires.
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