Let's Talk About Adding Weight to an HPI Inner Rotor

Dave Steele /
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So in the middle of a long ride, my inner rotor HPI Pinto sputters out. The crank seal had been spit out. It happens. But upon closer inspection when taking off the ignition (without splitting the case), the crank now has developed some play all around. Either the crank is f'ed, or just the bearing. Engine had about 500-700 miles on the rebuild. Bottom line is WTF.

Helpful Euro Puch tuners have suggested that an inner rotor on one side and a standard tight spring two/three shoe clutch's weight differential on both sides of the crank will eventually cause the crank bearing to fail -- due to the amount of stress. That is why HPI / Puchshop sells a 300g weight to balance the two sides out. The bearing could have failed for some other reason, not because of the HPI. Obviously, I must inspect it.

There is a good discussion about adding weight to a mini rotor on a ZA.

https://www.mopedarmy.com/forums/read.php?7,3572099,page=1

Before this motor is rebuilt for the third time, I was wondering if anyone had some insight into whether adding weight to an HPI is an ok idea (even if it does hinder spin up time). I really do not want to ditch the HPI set up, but I need my Puch not to develop major issues, as it is my daily / rally bike. Thanks! (edited)

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Let's Talk About Adding Weight to an HPI Inner RotorTopic by: Dave Steele Dave Steele 06/27/14 09:26AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Flagrant - Flagrant - 06/27/14 10:52AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Ryan . Ryan . 06/27/14 11:15AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Jr. Want A Knobby Jr. Want A Knobby 06/27/14 01:41PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Dave Steele Dave Steele 06/27/14 04:28PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: GET REALIZED! BE HERE NOW! GET REALIZED! BE HERE NOW! 06/30/14 06:59PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: *.* HONDA *.* HONDA 06/30/14 07:39PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 06/30/14 07:57PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 06/30/14 07:52PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Flagrant - Flagrant - 06/30/14 10:11PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 06/30/14 10:41PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 07/01/14 03:32AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 12:45AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Daniel '' Daniel '' 07/31/14 01:46AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 02:02AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 07/31/14 02:05AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Matt Smith Matt Smith 07/31/14 01:47PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Michael Mike Naz Michael Mike Naz 07/31/14 02:54AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Jesse Stephenson Jesse Stephenson 07/31/14 03:09AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: #CrazyWayne™ rocks. #CrazyWayne #CrazyWayne™ rocks. #CrazyWayne 07/31/14 03:17AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Ryan N. Ryan N. 07/31/14 01:08PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: SABAT! andDestroy SABAT! andDestroy 07/31/14 04:15AM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 12:38PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Dave Steele Dave Steele 07/31/14 12:41PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Big Al's Moped Shop Big Al's Moped Shop 07/31/14 01:06PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 01:17PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Big Al's Moped Shop Big Al's Moped Shop 07/31/14 01:27PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 02:59PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 01:42PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 07/31/14 01:53PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Dave Steele Dave Steele 07/31/14 02:37PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Dave Steele Dave Steele 09/05/14 02:35PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 09/05/14 03:04PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Dave Steele Dave Steele 09/05/14 03:27PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 09/05/14 03:43PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Big Al's Moped Shop Big Al's Moped Shop 09/05/14 04:12PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 09/05/14 04:24PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Dave Steele Dave Steele 09/05/14 04:34PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 10/13/14 03:20PM
  Re: Let's Talk About Adding Weight to an HPI Inner RotorRe: Marc Friedman Marc Friedman 09/05/14 06:25PM

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