Re: Rebuilding an 84/79 QT50

Jack Rutherford /
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I use this flex hone on qt50 and other cylinders. Is it the best thing to use? I don't know but it has worked fine for me in putting a decent crosshatch on the cylinder walls. It just takes 20 seconds maybe and run the drill in both directions. A new piston and rings are so cheap, I would just go that route. Of course, measure your ring gap and adjust as necessary or run the ring expander under the 2nd ring if your gap is too far from the minimum spec.

And of course, you need to thoroughly clean the cylinder and ports after honing it. New rings require cylinder honing. You've got a bit of wear inside your cylinder and it looks like that piston has soft seized several times - both indications would strongly suggest that a cylinder honing is mandatory. Not sure why some pw50 guy with experience would say otherwise. I guess I could speculate - he was probably assuming that you didn't have easy access to a hone but who knows what he was assuming, right?

I've seen qt's running with similar and worse piston/rings/cylinders but since you've got it apart, it only makes sense to replace what you can.

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Subject Written By Posted
  Rebuilding an 84/79 QT50Topic by: Geoffrey C Geoffrey C 07/18/20 10:18PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/18/20 10:21PM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 07/19/20 01:29AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/20/20 09:11PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/20/20 09:52PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/20/20 10:32PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/21/20 12:17AM
  Re: Rebuilding an 84/79 QT50Re: P D P D 07/21/20 07:45AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/22/20 08:35AM
  Re: Rebuilding an 84/79 QT50Re: P D P D 07/22/20 09:07AM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 07/22/20 12:52PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/21/20 05:05PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/22/20 09:26AM
  Re: Rebuilding an 84/79 QT50Re: P D P D 07/22/20 09:51AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/22/20 12:04PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/22/20 12:05PM
  Re: Rebuilding an 84/79 QT50Re: P D P D 07/22/20 12:38PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/22/20 01:01PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/22/20 09:20PM
  Re: Rebuilding an 84/79 QT50Re: P D P D 07/23/20 08:09AM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 07/25/20 10:55AM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 07/25/20 11:13AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/25/20 05:52PM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 07/25/20 07:19PM
  Re: Rebuilding an 84/79 QT50Re: Stephen Keller Stephen Keller 07/31/20 11:09PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/01/20 01:40PM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 08/01/20 03:13PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/01/20 05:16PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/23/20 10:40AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/24/20 01:49PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/24/20 07:38PM
  Re: Rebuilding an 84/79 QT50Re: Stephen Keller Stephen Keller 07/24/20 10:21PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/24/20 10:39PM
  Re: Rebuilding an 84/79 QT50Re: Stephen Keller Stephen Keller 07/25/20 12:59AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/25/20 12:27PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/25/20 12:57PM
  Re: Rebuilding an 84/79 QT50Re: Jack Rutherford Jack Rutherford 07/25/20 02:57PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/27/20 02:43PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/27/20 08:20PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/27/20 08:41PM
  Re: Rebuilding an 84/79 QT50Re: P D P D 07/27/20 09:35PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/27/20 09:56PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/28/20 09:56PM
  Re: Rebuilding an 84/79 QT50Re: Mark Kinsler Mark Kinsler 07/29/20 12:21AM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/29/20 06:58AM
  Re: Rebuilding an 84/79 QT50Re: Mark Kinsler Mark Kinsler 07/29/20 01:08PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/29/20 01:11PM
  Re: Rebuilding an 84/79 QT50Re: Mark Kinsler Mark Kinsler 07/29/20 01:16PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/29/20 07:34PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/29/20 09:58PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/30/20 11:56PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 07/31/20 10:20PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/01/20 05:17PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/02/20 09:13PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/02/20 09:26PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/07/20 09:43PM
  Re: Rebuilding an 84/79 QT50Re: Geoffrey C Geoffrey C 08/09/20 02:53PM

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