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clutching and gearing a 650 with aaens pipes

Polaris General Discussion

 
 
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  #1  
Old 09-28-2010
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Default clutching and gearing a 650 with aaens pipes

Hey guys. I'm looking for a push in the right direction for the clutching and gearing for a 1990 Indy 650 with a set of aaen pipes. Not really looking for the top speed but more trail and hill climbing set up mostly. Have a 133.5 rear suspension with a 1.5 camoplast track. Any suggestions?? has a red secondary not sure what hole it's in and an orange primary right now. not sure on the weights or what rpm it hits. Got it at the end of last year and didn't have a tac at all.
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Old 09-29-2010
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hmm, 1.8 or 2.0 ratio in the chain case would be a good starting point.
send aaen an email or call them for a good starting point.
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Old 09-29-2010
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My 650 with Aaens ran 10mb weights, aaen orange spring in primary, stock 36 degree helix, aaen yellow secondary spring in 2nd hole.
As for gearing, I did some playing with gearing and found that 20-37 gearing pulled very hard.
With my setup the clutch engaged at 5000rpms and pulled 9200rpms at WOT.
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Old 09-29-2010
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madcow what does the 1.8 or 2.0 ratio mean? sorry new to gearing. last sled I geared was a 97 zr440 and that I had a guy give me gears and told me put these in and that was all. never explained why or what gears they were. I know on another forum someone said 10mw weights with a blue polaris primary?? couldn't find anything for gearing tho. i'll call aaen today and see what they say for clutching.
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Old 09-29-2010
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They will tell you what I posted as that's exactly what was recommended to me from Olav himself.
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Old 09-29-2010
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Quote:
Originally Posted by blacktar08 View Post
madcow what does the 1.8 or 2.0 ratio mean?
If you divide the bottom gear teeth by the top that will give you your gear ratio. Example: 20-37 Gearing would be a ratio of 37 divided by 20= 1.85 gear ratio. Smaller number would be faster in the long run, bigger number will make it get there faster but with less top end.

Edit: Just thought I'd throw out there that I did try different gearing. I geared 2:1 and had major traction issues. I found with the 1.85 I still had plenty of power down low but could also see well into triple digits on the dream-o-meter.
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Last edited by Gotmud : 09-29-2010 at 10:01 AM.
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Old 09-29-2010
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ok. thanks. i'll see what I have in it now and find some gears if needed. Thanks!!
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Old 09-29-2010
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I'm not sure about the 10mw weights but I know you could run a polaris blue primary, I believe it's the same as Aaen orange.
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