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Tootal
| | Posted on Friday, November 06, 2015 - 11:19 am: | 
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Way to go Hootowl, all that brain work down the drain!
The main difference between a big twin harley and a buell is the harley has a compensator nut that smooths out the engine pulses to the tranny and then the belt. So the question is, does the sportster break belts as often as the buells? It doesn't have a compensator nut either. |
Teeps
| | Posted on Friday, November 06, 2015 - 11:49 am: |
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Tootal Posted on Friday, November 06, 2015 -
The main difference between a big twin harley and a buell is the harley has a compensator nut that smooths out the engine pulses to the tranny and then the belt.
Shock load...
Not drive belt specific but still good illustration of the principle.
https://www.youtube.com/watch?v=5FXNprbeBpc |
Hughlysses
| | Posted on Friday, November 06, 2015 - 01:27 pm: |
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OK, here's an adjustable idler roller arrangement that I think would be fairly easy to fabricate at home.
Stock idler bracket shown up top; modified at bottom. Photo of actual idler provided for comparison.
To do the modification, you drill the bottom mounting hole oversize (see Reepicheep's post above for suggested method). Drill a small hole to the left of the mounting hole, then saw cut from the sides to make a notch. The hole gives you a radius in the corner to avoid having a stress riser. Then drill and tap from the side for a socket head cap screw of the appropriate size. IIRC, these are available with a nylon insert so it would be self-locking. Due to the difference in distance between the adjustment point and the pivot (top mounting hole) and the distance between the roller axle and pivot, a small adjustment of the screw should provide a relatively large movement of the idler roller.
Thoughts?
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Electraglider_1997
| | Posted on Friday, November 06, 2015 - 03:50 pm: |
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Teeps,
Interesting video. Leonard Nimoy did a great job dropping those weights.  |
Tootal
| | Posted on Saturday, November 07, 2015 - 10:25 am: |
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Looks good Hugh! May modify mine at the next belt change. |
Big_island_rider
| | Posted on Sunday, November 08, 2015 - 02:29 am: |
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"They do. Tubers use them. Tubers don't bend their belts backwards, and they lose belts with the same frequency and randomness as the XBs."
"The main difference between a big twin harley and a buell is the harley has a compensator nut that smooths out the engine pulses to the tranny and then the belt. So the question is, does the sportster break belts as often as the buells? It doesn't have a compensator nut either."
Hootowl - Point well taken, as I am new to Buells I did not know that the tubers did not bend the belt backwards.
Tootal - Good question on the Sportsters. I have not heard about belt issues on Sporties. My wife has a 2007 Sportster Low with 22,500 or so miles. I just looked at the belt and it looks almost new. No fraying or cracking. Only real difference is that the backside of the belt is ribbed (for her pleasure)   |
Steveford
| | Posted on Sunday, November 08, 2015 - 04:38 am: |
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Fruitsters snap belts but I don't think it's as common as it is with the Buells.
Knock on wood, I've only broken one belt on a Buell in all of these years and that was caused by my Useless running poorly - it was doing a lot of herky/jerky due to the TPS having slop in it. |
Brother_in_buells
| | Posted on Sunday, November 08, 2015 - 02:47 pm: |
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Some here have slotted the lower hole a bit.
I have done the same ,only 1mm
It's not much but now it's possible to turn the idler wheel with a bit of force by hand.
(bike unloaded) |
Electraglider_1997
| | Posted on Wednesday, November 18, 2015 - 01:09 pm: |
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I installed the new belt on my son's 07 and it went on easily in comparison to my bike's belt changes. I loosened the axle until it pop'd and just rolled the new belt on the rear sprocket by turning the back wheel in the forward direction. Rolled right on without undue effort. I didn't modify either of the holes on the idler because it's my boy's bike and I'll wait to do it, if at all, on my own ULY. |
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