I4 magneto will it fit cub

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I4 magneto will it fit cub

Postby getitrunning » Thu Nov 09, 2023 11:47 am

just wondering if an I4 magneto will fit and work properly on a cub that has a j4 on it now

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Re: I4 magneto will it fit cub

Postby Jim Becker » Thu Nov 09, 2023 1:31 pm

I believe it can be bolted on and the engine will run. But the lag angle is way wrong for the Cub engine. You wouldn't be able to get the timing right. I don't know if you could overcome the problem by using a J-4 impulse coupling.

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Re: I4 magneto will it fit cub

Postby Eugene » Thu Nov 09, 2023 1:33 pm

Lag angle/advance for the H4 is 35 degrees for gas tractors. Lag angle for the Cub is 13 degrees. So, not work.
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Re: I4 magneto will it fit cub

Postby Steve Butram » Thu Nov 09, 2023 6:59 pm

The I4 Mag has a different spark advance than the J4.
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