(800) 853-2651
SHOP NOW

10-20 Magneto Update - Advice Needed

P

Paul in CT

New User
A while ago I posted that I had just had my FM-J magneto rebuilt and was remounting it to my McCormick-Deering 10-20. Since the engine was left at TDC on #1 I rotated the magneto backwards until it was passed the #1 plug wire and then rotated it forward until I felt resistance. It was close to the #1 terminal, but before it. I bolted everything up and now when I try to start it I get 3-5 nice "hits" and it sounds like it is going to take off and then it dies. Have I set the timing too late? What else should I check.

Any help would be appreciated.

Thanks in advance.
 
Paul, Fireing order 1,3,4,2, Bring it back around Just before #1 pull plug wire and see if you get spark when #1 is TDC. If spark it before or after adjust with screws on mag conector.
If it is way out you mag is set wrong. oldiron29
 
You may need to bring No1 piston to TDC on the compression stroke. Once you have No1 piston at TDC look to see where your rotor is pointing.
It should be at the No1 plug tower. If it's off
you need to pull the mag and rotate the rotor so it's pointing to the No1 plug tower then reinstall the mag. Hal
 
When I set mine, I took out the spark plugs so it would be easier to turn and not roll backwards then rolled the engine slowly over till I got it to TDC, that way all the slop in the gears would be taken out before setting the mag in the right holes. It fired right up everytime with no kickback. There was also some different plates with holes for converting old typ mags to new ones, but don"t remember much about those, just know they had them and may make it tough to line up if mag has one plate and timing side has the other.
 
Thanks for everyone's help. I checked and it turns out that I had TDC right but the mag was firing WAY late. I had set the magento at the point I felt resistance thinking it would fire right after that. Little did I know it still had a ways to go. Live and learn.

Will be resetting everything today and will get you posted. Thanks again.
 
You must log in or register to reply here.

Similar threads

J
1925 McCormick Deering 10-20
Replies
2
Views
381
johndeere48
J
J
1928 McCormick Deering 10-20 Throttle Issue
2
Replies
27
Views
1K
rustred
rustred
M
MH 20 Not staying running
Replies
4
Views
483
used red MN
U
stevieb49829
Update on a couple of related things
Replies
0
Views
561
stevieb49829
stevieb49829
A
Need SOS help
Replies
7
Views
521
FarmerBlair
F
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.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top