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Drive ratio upgrade HOW TO: Belt Pulleys, Primary sprockets, improve TQ up to 13%

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  #1081  
Old 08-09-2018, 08:46 AM
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Originally Posted by Jaximus
I used 1/4 spacer, but I had a different pulley pn#. I actually bought 1/4 and 3/8 and sent the 3/8 back just to avoid waiting.

let us know what was needed when you finish!
I appreciate the help. Do you remember what length pulley bolts were needed? Or where the stock ones long enough? Obviously replacing them with new bolts, just not sure on size yet.
 
  #1082  
Old 08-09-2018, 08:54 AM
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Originally Posted by iaminsider
I appreciate the help. Do you remember what length pulley bolts were needed? Or where the stock ones long enough? Obviously replacing them with new bolts, just not sure on size yet.
The stock ones were not long enough, trust me, I still have the new stock ones I bought. I was lucky to have grade 8 bolts available at the hardware store. They were approx. 3/8 to 1/2 longer than stock. Do not remember the exact length though.

Im getting ready to do the 30T front myself!

Good Luck.
 
  #1083  
Old 08-09-2018, 08:56 AM
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That is what I was figuring. Thanks for helping confirm my thoughts on it.

I will report back when I get it all buttoned up with details for everyone.
 
  #1084  
Old 08-13-2018, 01:48 PM
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Hey guys, in the middle of doing this upgrade right now. On an fxsb, the spacer width for rear pulley, listed in post 3? Does not work for me. Just a heads up. It says it needs a 1/8" spacer, which is what I got, but that still puts my belt 1/8" closer to the tire than factory. Which will not work at all if I do a 260 tire.

1/4" should fit and make everything same as factory. With the wider pulley I bought, it looks like a 3/8" would be fine too, however split the difference and 5/16 might be perfect.

It also looks like the belt has been running on the outside of the transmission pulley, so with the exception of the wiggle room from the slightly wider pulley, I don't have much room to put a wider spacer on, before I start getting misalignment problems
 

Last edited by weezl; 08-13-2018 at 01:50 PM.
  #1085  
Old 08-15-2018, 08:29 PM
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As promised I'm here to report back now that my project is complete.

2011 Street Bob
I used the 40117-00 70t pulley out back. Mine needed a 3/8" spacer. I used 3" bolts but could have easily gotten away with 2 3/4" instead.
Up front was a tri-glide 30t pulley.
 
  #1086  
Old 08-15-2018, 08:54 PM
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Yeah, so whachya think bro? Screws eh?
 
  #1087  
Old 08-15-2018, 08:57 PM
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For the short ride I took, great upgrade. I need more saddle time to really get a feel for it.
 
  #1088  
Old 08-16-2018, 06:22 AM
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Where you feel it most is in the first three gears.
What you will notice is they have suddenly gotten much shorter LOL, that is if you enjoy drag starts. I found that for a while right after I did mine a couple years ago, I longed for a seventh gear just ti get the motor to settle down on a longer than 1/4 mile strtch. But in reality, 115mph is not a speed I can sustain that long a time riding in a metro like environment
Maybe if I lived in the mid west perhaps yes.
You will love how effortlessly you can over pass traffic while in fifth with out having to drop down to fourth cruisin at aroung 3700rpm
Enjoy!
Goin on four years since I did mine and still get exited about how much more fun thsn stock the bike is with the 30/70 turning my belt
 
  #1089  
Old 08-16-2018, 06:40 AM
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Now that I did notice. I was banging off the limiter real quick last night. I need to get some traffic rides in or a ride with my buddy who has a stage 1 103 softail slim to really realize the change.

I also installed Andrews 48h cams at the same time. Whole new bike.
 
  #1090  
Old 10-16-2018, 10:32 AM
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Default Thank you!!!

Awesome read, well done!!!
 


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