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  #1  
Old 19th August 2009
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Default I got this beautiful new rear pulley ...

... but the problem is that all shops are telling me I need to re-consider.

According to one of the shops, my '05 XL883L comes with a 136 tooth 1 1/8" belt and a 68 tooth rear pulley. I have a 65 tooth pulley I want to put on, and am told I will need to replace my belt to a 1 1/8" 133 tooth belt.

According to my last J&P cycles catalogue, there's only one from Dayco (602-277), none in that size from Gates.

Aquiring the parts is not the problem, it's the loss of torque & rwhp. I'm being told that I'll loose quite a bit of torque & rwhp with this conversion. This bike is quite peppy for its size, so how much will I really loose?

If so, would a 1200 upgrade fix this? The factory 1200 has a 137 tooth belt, so I can only imagine it comes with a 70 tooth pulley. Changing it down to a 65 would cause problems too?

I need a good explanation before I go ahead and make a mistake...
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  #2  
Old 19th August 2009
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Putting a smaller pulley on the back would actually make the bike feel a little less peppy and torquey, slower out of the hole for sure. But you will be turning lower RPM's on the highways if thats what your after. As far as HP and TQ figures, they will still be the same your changing gearing not anything as far as the motor is concerned idk who told you you would loose HP but there idiots.
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  #3  
Old 19th August 2009
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I switched my International '93 Sportster from a 55 rear pulley and 125 tooth belt to the US Standard of 61 tooth rear pulley and a 128 tooth belt and didn't really notice any big difference.
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  #4  
Old 19th August 2009
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Quote:
Originally Posted by jharback View Post
I switched my International '93 Sportster from a 55 rear pulley and 125 tooth belt to the US Standard of 61 tooth rear pulley and a 128 tooth belt and didn't really notice any big difference.
You increased it... I'm actually decreasing it. Will it really matter?
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  #5  
Old 19th August 2009
XLdaveR XLdaveR is offline
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Quote:
Originally Posted by funnythebunny View Post
... but the problem is that all shops are telling me I need to re-consider.

According to one of the shops, my '05 XL883L comes with a 136 tooth 1 1/8" belt and a 68 tooth rear pulley. I have a 65 tooth pulley I want to put on, and am told I will need to replace my belt to a 1 1/8" 133 tooth belt.

According to my last J&P cycles catalogue, there's only one from Dayco (602-277), none in that size from Gates.

Aquiring the parts is not the problem, it's the loss of torque & rwhp. I'm being told that I'll loose quite a bit of torque & rwhp with this conversion. This bike is quite peppy for its size, so how much will I really loose?

If so, would a 1200 upgrade fix this? The factory 1200 has a 137 tooth belt, so I can only imagine it comes with a 70 tooth pulley. Changing it down to a 65 would cause problems too?

I need a good explanation before I go ahead and make a mistake...
All '04&up Sporty's use a 68 tooth rear pulley. Factory 1200's has a 137 tooth belt and 29 tooth trans sprocket (30 tooth for HDI)
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  #6  
Old 19th August 2009
XLdaveR XLdaveR is offline
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I'm fitting a 2000+ BT rear pulley to my '05 Sporty

This may help
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  #7  
Old 19th August 2009
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Change the front pully, if you want it to go faster put a 30 or 31 cog pully on it remove the 29 cog pully, I put a 27 tooth cog on my XL1200S from a 883, Bolted riight on, then put a Baker 26 tooth lightweight alloy sprocket on it, (superb product) didn't even have to change the belt. also put a 7500RPM Screamin Eagle ign mod on it, the performance increase was dramitic! I show rice rockets my taillight now. Sportster is a sporty bike, if you want a hiway cruiser get a Road King, Soft Tail even a Dyna Glide. Just my opinion for what it's worth. Deane
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  #8  
Old 20th August 2009
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If you drop 3 teeth on the back pully you can restore the same gearing by going down 1 tooth on the front pulley. So do the rear pulley as you planned and swap out your 28 tooth front pulley (I assume that's right for an '05 883 where you are) for a 27 tooth one.

Your belt might be too long so find one that's 2-3 teeth shorter than your stock 136 teeth.
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  #9  
Old 20th August 2009
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Quote:
Originally Posted by FoxsterUK View Post
If you drop 3 teeth on the back pully you can restore the same gearing by going down 1 tooth on the front pulley. So do the rear pulley as you planned and swap out your 28 tooth front pulley (I assume that's right for an '05 883 where you are) for a 27 tooth one.

Your belt might be too long so find one that's 2-3 teeth shorter than your stock 136 teeth.
Read your update and the bike is lookin' good, Fox...
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Old 20th August 2009
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Quote:
Originally Posted by funnythebunny View Post
You increased it... I'm actually decreasing it. Will it really matter?
Yes, I understand that your decreasing but, I would think that if I didn't hardly notice any difference on an increase that you'll probably not notice much on a decrease.
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