Re: Point gap vs timing

Mark Kinsler /
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> Scott Bard Wrote:

> -------------------------------------------------------

> Another piece of the puzzle to add into the whole “ spark output “

> circuit is the “air gap” of the stator coils to the magneto.

>

> I bought a barn find 1979 Puch maxi with a ZA50 engine.

>

> The magneto was removed from the moped when I bought it.

>

> I was chasing a no spark condition.

>

> Followed the normal troubleshooting steps of cleaning and setting

> points.

>

> As it turns out, there was no air gap of the coils to the magneto.

>

> From what I found, the coils need to be .020 away from magneto to

> generate output.

>

> So now that there is the air gap to the coils, I have spark and output

> for the lights.

>

> I suspect the previous owner at some point, had the magneto off and used

> a flat blade screwdriver to loosen every flat blade screw behind the

> magneto.

>

> A Girl Scout cookie box lid, the green o es with the mint cookies, is

> .020 thick.

I'm sorry. It's not clear where your 'air gap' is located. The magnets are glued to the spinning flywheel. The coils are wound on iron cores (laminated silicon steel, actually) and are bolted to a mounting plate so they stay just inside the flywheel rim. If there wasn't an air gap between the magnets and the coil cores the flywheel (and the engine) couldn't rotate: the magnets would scrape the coils. When there is a small gap between coils and magnets (about 20 thousandths of an inch is a good distance) those magnets zoom past the coil cores, and that generates electricity for ignition and lights. That whole assembly, flywheel, magnets, coil, and all, is generally known as the 'magneto.'

Can you clarify what it was you did to get your bike working?

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: Probably Fred Probably Fred 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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