F-4 Magneto Question

Posted by Tom43 on February 18, 2007 at 06:13:18 from (70.143.57.160):

Dear Board,
I have worked on several Wico magnetos on Deere tractors, but I have some questions about the F-4 used on the F-20 and F-12. Some say that when the flywheel mark is at TDC and that number 1 piston is on compression to line up the little holes so that the ponts are just opening. I presume you would want the spark advance lever in the full retard position although I have heard it both ways.

Others have told me that the tractor is properly timed when the impulse snaps as you pass the TDC mark. Which is it as there could be a discrepancy between the two. If we hook up a battery and a timing light what should retard timing be? Will it be TDC? How much advance should we get when the spark lever is in the full advance position? I have wondered about these questions for a long time and hope some of the board members will enlighten me.

Replies:

• Re: F-4 Magneto Question Roger Mills 08:32:28 02/18/07 (0)
• Re: F-4 Magneto Question Roger Mills 07:18:30 02/18/07 (1)
  • Re: F-4 Magneto Question Dave Allgire 08:53:23 02/18/07 (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 ]