Magneto Timing question

Posted by JRSutton on May 15, 2012 at 19:18:15 from (75.130.109.233):

Going to put the magneto on the 4H project super A tomorrow -

I'm not too experienced with magnetos.

I thought I knew what I was doing until I read the manual...

Tells me to put cylinder 1 at tdc - compression stroke. I'm good with that - makes sense. Figured I'd even go a hair past to make hand cranking safer.

Then turn the (not yet installed) magneto so it's ready to fire on plug 1.

Easy enough - mine has the little window - I can see when it's ready to fire on 1. Nice and easy. I tested it with a spark plug to be sure I had it right - sparks just like I expected with one click.

Next step is install the magneto - and retard it fully.

Ok - makes sense...

But then it tells me to crank the engine exactly one revolution back to TDC - which of course would be the exhaust stroke.

Then turn the mag towards advance until it clicks - and lock it in there. which would make a whole lot more sense to me to have done without cranking the engine that last full crank..

... ?

What am I missing here? Why crank the engine? wouldn't that make it spark on the exhuast stroke?

I assume the manual's correct and I'm missing something - but what?

Am I NOT supposed to have the mag ready to fire on one? perhaps it should have just fired on 1 when I install it???

Very confused here.

Replies:

• Re: Magneto Timing question Bob M 08:19:22 05/16/12 (1)
  • Re: Magneto Timing question JRSutton 08:53:56 05/16/12 (0)
• Re: Magneto Timing question Jim Becker 06:58:56 05/16/12 (1)
  • Re: Magneto Timing question JRSutton 08:39:49 05/16/12 (0)
• Re: Magneto Timing question James Williams 06:22:33 05/16/12 (1)
  • Re: Magneto Timing question JRSutton 06:35:01 05/16/12 (0)
• Re: Magneto Timing question Bob M 20:05:54 05/15/12 (1)
  • Re: Magneto Timing question JRSutton 04:58:25 05/16/12 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Advanced Posting Options 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.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Attach Serial # List  Return to Post

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 ]