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  #1  
Old 29th August 2015
chris_b_owens's Avatar
chris_b_owens chris_b_owens is offline
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Default DIY Belt Tensioner for taller shocks and Cafe Bikes

So I wanted to install some taller shocks than the 13" Burly Stilettos that I had. I decided to go with the 15" version and I am very happy with them. I did have an issue with a very loose belt and because of the new geometry the belt was just barely rubbing on the exhaust bracket.

I decided I would definitely need a belt tensioner and started looking for one. Unfortunately I didn't find much. Free Spirits makes a top quality one but it is expensive and uses the same mounts as my RSD exhaust.

I then figured I would try and make something work so here is what I came up with.

I found this Dorman 419-109 belt tensioner for cars on Amazon for $20. The reviews looked good so I figured I would pull the trigger.
http://www.amazon.com/gp/product/B00...ilpage_o02_s00

When I got it I was pretty happy. It seems to be solidly built and has a very sturdy spring. The only downfall is that the idler pulley is plastic but I guess it doesn't need to be all that strong.



I went to the local hardware store and bought some 1.5 12guage angle iron. I cut off about a 4 inch piece of it.



I laid the tensioner on it and marked where the holes would be. I punched the center and drilled them out to fit some 3/8 socket head bolts. I grinded the corners and smoothed everything out with a sanding flap disk on my angle grinder.





Next I found a place on the RSD exhaust mounting bracket where I could mount it. I marked the holes and drilled on the bracket the same way I did on the angle iron.



I had to trim up the angle iron on the exhaust bracket side to shorten it up.



Mounted it to the newly drilled exhaust bracket.



I test fitted everything and it all lined up pretty well.





Painted the bracket up with some satin black rattle can. Mounted it all back up using some red Loctite on the threads.





Mounted up the exhaust and we are done!





Here is the before:



And the After:



It all seems to work really well. The tensioner is spring loaded and all seems to be good for now. I will keep you posted.

Now I know it would be better and arguably easier to have welded a piece of flat bar to the exhaust bracket and accomplish the same thing. Unfortunately I do not have any welding equipment as of yet but when I do I will having a lot of fun making all kinds of stuff.

Hope this helps some of you that have ran into the same problem.
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  #2  
Old 29th August 2015
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Default

Nicely done
Be interesting to track the belt life
What is the seat height?
Two of your pics show a ground strap. Is that frame to motor?
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  #3  
Old 29th August 2015
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chris_b_owens chris_b_owens is offline
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Default

Quote:
Originally Posted by sportsterdoc View Post
Nicely done
Be interesting to track the belt life
What is the seat height?
Two of your pics show a ground strap. Is that frame to motor?
Thank you! It is the ground on the rear stabilizer linkage. The seat height is right at 32"
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  #4  
Old 29th August 2015
madlim madlim is offline
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Default

Thank you for sharing this Chris, I've been fiddling with something like this in my mind for quite some time.
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  #5  
Old 29th August 2015
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Thanks for that. Good luck with it, but it looks like you're on the right track!
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Old 30th August 2015
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Default

Looks good, might have to copy it. See, this is the kind of customizing stuff we wrote about before.

One nice thing is down the road you should be able to swap out the pulley for something sexier.
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  #7  
Old 30th August 2015
madlim madlim is offline
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Default

Bah, couldn't help myself, just ordered the same belt tensioner....
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  #8  
Old 30th August 2015
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chris_b_owens chris_b_owens is offline
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Default

Quote:
Originally Posted by Ranchero50 View Post
Looks good, might have to copy it. See, this is the kind of customizing stuff we wrote about before.

One nice thing is down the road you should be able to swap out the pulley for something sexier.
Lol Go for it! That's why I posted it.


Quote:
Originally Posted by madlim View Post
Bah, couldn't help myself, just ordered the same belt tensioner....
Lol nice!
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  #9  
Old 30th August 2015
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Default

Looks good, but be careful on first few test rides. On rubbermounts, shocks that long with short forks puts the bike on the edge of the high speed wobble zone.
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Old 30th August 2015
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Default

Quote:
Originally Posted by XLXR View Post
Looks good, but be careful on first few test rides. On rubbermounts, shocks that long with short forks puts the bike on the edge of the high speed wobble zone.
I got it up to 118 or so right after install with no issues but just in case I went ahead and installed a steering stabilizer to be safe. Works like a charm and rides great.
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