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Rear pulley teeth?

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Old Aug 29, 2013 | 09:24 PM
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Default Rear pulley teeth?
I just bought a new rear pulley, but i just noticed its a 64 tooth and i believe my stock 09 1200 custom is a 68?
What will this affect if i run it? Or can i even use it?
 
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Old Aug 29, 2013 | 09:38 PM
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You'll be running a lower overall gear ratio in every gear. This means you'll have less torque with higher horsepower. You will also be running lower RPM in every gear.
 
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Old Aug 29, 2013 | 10:44 PM
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Will this affect the speedo?
 
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Old Aug 30, 2013 | 12:04 AM
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Don't recall what model used a 64T pulley, but the offset will likely be different than your 68T. Your belt might be a tad long as well.
 
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Old Aug 30, 2013 | 01:04 AM
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The '09 has a 1-inch pulley; earlier rubbermounts were 1.125-inch.
 
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Old Aug 30, 2013 | 07:55 AM
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Originally Posted by JeffJA
Will this affect the speedo?
Yes, it will make you faster than you actually appear. Your speedo will read slow.
 
Last edited by Scuba10jdl; Aug 30, 2013 at 02:37 PM.
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Old Aug 30, 2013 | 11:24 AM
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Originally Posted by Scuba10jdl
This means you'll have less torque with higher horsepower.
I don't understand this. Do you mean real numbers (ie it would affect a dyno run), or just seat of your pants?
 
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Old Aug 30, 2013 | 11:49 AM
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Originally Posted by dwagar
I don't understand this. Do you mean real numbers (ie it would affect a dyno run), or just seat of your pants?
It applies at the wheel, not the engine. Dynos measure this and then calculate the engine output. There is a good article on the NRHS tech tips section about HP and torque.
 
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Old Aug 30, 2013 | 11:57 AM
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Here is a link to a site with some good info on changing your final gearing. Scroll halfway down. They also sell speedo correctors.

http://883sportster.webs.com/howtocr...rsportster.htm
 
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Old Aug 30, 2013 | 12:07 PM
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Originally Posted by Scuba10jdl
You'll be running a lower overall gear ratio in every gear. This means you'll have less torque with higher horsepower. You will also be running lower RPM in every gear.
Originally Posted by Scuba10jdl
Yes, it will make you appear to be going faster than you actually are.
I think you have it backwards.
Going from a 68T rear wheel pulley to a 64T pulley will give you a higher final gear ratio. The rear wheel will be turning a higher RPM in relation to the front (drive) pulley.
The speedo will be showing a speed that's less than your actual speed by ~6%.
 
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