Re: H magneto timing problem

Posted by Bob on January 28, 2006 at 15:49:24 from (64.21.249.40):

In Reply to: Re: H magneto timing problem posted by mikeinWA on January 28, 2006 at 15:35:07:

As I told the other guy with timing troubles, the slots in the mag drive on the engine must be horizontal (- -) when #1 is at TDC of the firing stroke.

Does the impulse coupling work on your gutted-out mag? This might not seem important, because it is no longer a mag, needing the "snap action" for a good spark, but it IS important.

When the engine is just being cranked over, the impulse will grab, and then "snap", giving a starting timing of near TDC.

As the engine "catches" and speeds up, the impulse will no longer catch, and the timing will advance to "running timing", probably 30+ degrees.

So, when you are turning it over by hand, and come up on #1 TDC on the firing stroke, the impulse will wind up and "snap", opening the points, and giving a spark at about TDC.

If the impulse does NOT grab, and then snap at TDC, the spark at slow cranking will be 30+ degrees too early. If it were still a mag, and the impulse failed, there would be little, if any spark while cranking slowly, however, with this conversion to Kettering ignition, any time time points OPEN, there will be a hot spark, even with a failed impulse.

If the impulse is REALLY working, and it's getting out of time, the possiblilites are:

1.)Something wrong with the timing gears/mag drive. This can be checked by verifying the drive slot is horizontal at TDC.

2.)The impulse is keyed to the mag shaft... could be problems there.

3.)There could be a problem with the rotor drive gears in the mag... little gear loose, or wear and tooth damage.

Replies:

• Re: H magneto timing problem mikeinWA 18:23:09 01/28/06 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]