NU50: Modification of the Rear Pully

alex ganz /
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Some more substantive content for interested minds. I have a feeling this one's going to attract a lot of trolls, so please take note of the disclaimers posted below the overview.

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Overview:

Using a wider (than stock) belt on the Urban is a popular way to increase the bikes maximum obtainable speed.* The general theory being that the increased width causes the belt to sit higher in the variator, which in turn gives a better drive/driven ratio. But the increased width also means that the belt may not be able to sink as low in the rear pulley (which would limit top speed). The steps below show one approach to mitigating that factor by increasing the amount by which the rear pulley face-plates can separate.

DISCLAIMER & NOTES:

- This has been mentioned on the forum before, and is a widely know trick in the scooter-world; I did not invent this technique in any way.

- This is potentially dangerous and/or unnecessary. If your belt sinks too low in the rear pulley, it could get stuck (belt too short). If the belt rides to high in the variator, it may come off entirely (belt too long). Know what belt-length you're working with before attempting this. NOT RECOMMENDED FOR STOCK BELTS.

- If you're engine is already maxing its power output (with a current setup), this may not do anything at all (except mess with RPMs - in a bad way).

3.PNG

Step One:

Remove rear pulley. Disassemble (including collar, but not internal bearings). I took this opportunity to clean up some heavy pitting and rust; a few minutes in the lathe had things looking good.

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This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  NU50: Modification of the Rear PullyTopic by: alex ganz alex ganz 11/07/17 02:48PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 11/07/17 02:50PM
  Re: NU50: Modification of the Rear PullyRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 11/07/17 03:38PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 11/07/17 06:30PM
  Re: NU50: Modification of the Rear PullyRe: Mike Boyd Mike Boyd 11/07/17 10:10PM
  Re: NU50: Modification of the Rear PullyRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 11/08/17 03:28AM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 11/08/17 07:02AM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 11/08/17 11:45AM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/07/18 05:54PM
  Re: NU50: Modification of the Rear PullyRe: Ryan . Ryan . 11/11/17 12:44PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 11/12/17 11:40PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 07/09/18 11:43AM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/09/18 01:07PM
  Re: NU50: Modification of the Rear PullyRe: - Joe - - Joe - 07/10/18 08:55AM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/10/18 11:27AM
  Re: NU50: Modification of the Rear PullyRe: Shawn Manthey Shawn Manthey 07/10/18 06:15PM
  Re: NU50: Modification of the Rear PullyRe: Captain Janeway Captain Janeway 07/10/18 06:30PM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/10/18 06:57PM
  Re: NU50: Modification of the Rear PullyRe: Shawn Manthey Shawn Manthey 07/30/18 10:02PM
  Re: NU50: Modification of the Rear PullyRe: Shawn Manthey Shawn Manthey 07/10/18 07:28PM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/10/18 07:38PM
  Re: NU50: Modification of the Rear PullyRe: Captain Janeway Captain Janeway 07/10/18 08:15PM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/10/18 08:31PM
  Re: NU50: Modification of the Rear PullyRe: Captain Janeway Captain Janeway 07/11/18 11:53AM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 07/10/18 08:03PM
  Re: NU50: Modification of the Rear PullyRe: Shawn Manthey Shawn Manthey 07/10/18 10:19PM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/10/18 10:33PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 07/11/18 12:51PM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/11/18 01:13PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 07/11/18 01:35PM
  Re: NU50: Modification of the Rear PullyRe: Crazy Wayne Crazy Wayne 07/11/18 01:44PM
  Re: NU50: Modification of the Rear PullyRe: Captain Janeway Captain Janeway 07/11/18 03:17PM
  Re: NU50: Modification of the Rear PullyRe: alex ganz alex ganz 07/31/18 12:17PM
  Re: NU50: Modification of the Rear PullyRe: Jack Rutherford Jack Rutherford 12/09/18 09:11AM
  Re: NU50: Modification of the Rear PullyRe: Jack Rutherford Jack Rutherford 10/03/20 04:52PM
  Re: NU50: Modification of the Rear PullyRe: Doug Wilhelm Doug Wilhelm 10/12/20 12:38PM
  Re: NU50: Modification of the Rear PullyRe: Jack Rutherford Jack Rutherford 10/12/20 07:24PM
  Re: NU50: Modification of the Rear PullyRe: Jack Rutherford Jack Rutherford 10/14/20 10:06PM
  Re: NU50: Modification of the Rear PullyRe: Jack Rutherford Jack Rutherford 10/17/20 06:15PM
  Re: NU50: Modification of the Rear PullyRe: Jack Rutherford Jack Rutherford 10/29/20 02:13PM

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