Point gap vs timing

Mark Kinsler /
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In my continuing lesson on how an advanced engineering degree enables the recipient to understand nothing, I think I have finally stumbled upon several truths.

One (and please tell me if this or any of these are correct) is that late timing will vastly reduce my Trac Clipper's power, unto bogging down on my test hill and in addition will cause carbon to form on the spark plug.

Two: The point gap is important not because it determines something strange and electrical about the ignition points, which are just a simple (but very sturdy) switch, but because it is a switch that is operated by a cam. The gap in the points is, in fact, a simple means of properly positioning the 'cam follower,' which is that bit of brown fiber stuff that drags against the cam. Thus positioned, the points will open at approximately the desired position of the flywheel at such time as the lump on the cam contacts the follower. Further adjustments can then be made by adjusting the position of the plate upon which the points assembly is mounted.

Three: my point gap is probably too small, which is why, according to the Sears timing light I've just discovered in the garage, my timing is way, way too late. I'm getting a reading of maybe 2 degrees before top dead center at the maximum advance available from the slots in the magneto mounting plate. Myron's Mopeds specifies 14-16 thousandths of an inch, and I think this sort of engine likes a 13-17 degree advance.

Four: the holes in my flywheel are carefully positioned such that neither the point gap nor the flywheel position when they open can be observed without x-ray vision. I regard this as some sort of divine revenge.

Further enlightenment and/or correction would be greatly appreciated.

Mark Kinsler

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Point gap vs timingTopic by: Mark Kinsler Mark Kinsler 07/26/20 05:43PM
  Re: Point gap vs timingRe: P D P D 07/26/20 06:15PM
  Re: Point gap vs timingRe: Overpriced Parts Overpriced Parts 07/26/20 09:07PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/26/20 09:45PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/26/20 10:13PM
  Re: Point gap vs timingRe: Den 23 Den 23 07/26/20 07:17PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/26/20 08:54PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/26/20 09:18PM
  Re: Point gap vs timingRe: Den 23 Den 23 07/26/20 11:42PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 05:13AM
  Re: Point gap vs timingRe: Den 23 Den 23 07/27/20 10:28AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 12:19PM
  Re: Point gap vs timingRe: Richard Eberline Richard Eberline 07/26/20 10:00PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 02:31AM
  Re: Point gap vs timingRe: Mark Anderson Mark Anderson 07/27/20 08:52AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 12:05PM
  Re: Point gap vs timingRe: Jay Rivett Jay Rivett 07/27/20 09:02AM
  Re: Point gap vs timingRe: P D P D 07/27/20 10:16AM
  Re: Point gap vs timingRe: Mark Anderson Mark Anderson 07/27/20 09:36AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 12:09PM
  Re: Point gap vs timingRe: Den 23 Den 23 07/27/20 12:40PM
  Re: Point gap vs timingRe: Pushrod Fifty Pushrod Fifty 07/27/20 10:28AM
  Re: Point gap vs timingRe: P D P D 07/27/20 10:46AM
  Re: Point gap vs timingRe: Jay Rivett Jay Rivett 07/27/20 10:53AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/27/20 01:29PM
  Re: Point gap vs timingRe: P D P D 07/27/20 03:57PM
  Re: Point gap vs timingRe: Jay Rivett Jay Rivett 07/27/20 07:12PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 07:25AM
  Re: Point gap vs timingRe: Den 23 Den 23 07/28/20 08:39AM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 02:08PM
  Re: Point gap vs timingRe: P D P D 07/28/20 08:52AM
  Re: Point gap vs timingRe: Den 23 Den 23 07/28/20 09:12AM
  Re: Point gap vs timingRe: live ɘvil live ɘvil 07/28/20 06:59PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 02:15PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 02:00PM
  Re: Point gap vs timingRe: Mike Boyd Mike Boyd 07/28/20 02:22PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/28/20 02:39PM
  Re: Point gap vs timingRe: Richard Eberline Richard Eberline 07/28/20 07:28PM
  Re: Point gap vs timingRe: live ɘvil live ɘvil 07/28/20 07:38PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 09:36PM
  Re: Point gap vs timingRe: P D P D 07/28/20 10:05PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/28/20 10:07PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 10:20PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 09:40PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 09:47PM
  Re: Point gap vs timingRe: Dirty30 Dillon Dirty30 Dillon 07/28/20 09:48PM
  Re: Point gap vs timingRe: Mark Kinsler Mark Kinsler 07/28/20 10:04PM
  Re: Point gap vs timingRe: Scott Bard Scott Bard 07/28/20 09:41PM

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