switch Dist. to Mag

Farmall B & BN Tractors, 1939-1947
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Dusty B
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Zip Code: 61736
Tractors Owned: '45 SC Case
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Location: IL, Downs

switch Dist. to Mag

Postby Dusty B » Thu Nov 04, 2021 6:00 pm

What is required to switch a B from distributer ignition to magneto?? What is the correct magneto??
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

Jim Becker
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Re: switch Dist. to Mag

Postby Jim Becker » Thu Nov 04, 2021 8:40 pm

The original was an IH model H-4.

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Dusty B
10+ Years
10+ Years
Posts: 1811
Joined: Wed May 23, 2007 7:35 am
Zip Code: 61736
Tractors Owned: '45 SC Case
Circle of Safety: Y
Location: IL, Downs

Re: switch Dist. to Mag

Postby Dusty B » Mon Nov 15, 2021 9:46 am

Can you switch froma distributor to a mag directly or is there a different drive required?? Have an H-4 mag to be checked out.
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

Jim Becker
Team Cub
Team Cub
Posts: 16367
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: switch Dist. to Mag

Postby Jim Becker » Mon Nov 15, 2021 12:10 pm

It is a direct bolt-on. A battery ignition can be installed and timed with a governor gear not properly in time. A magneto requires the governor to be timed correctly. You may find that you need to correct the governor timing. This is the same as with a Cub. The situation has been discussed in the Cub forum and you should be able to find those discussions if you need details.

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Rick Spivey
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Re: switch Dist. to Mag

Postby Rick Spivey » Tue Nov 16, 2021 9:01 pm

Do NOT connect the small wire currently on the distributor, coming from the coil, to the magneto. You will instead need to connect the magneto to a grounded switch.
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)


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