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J-4 Magneto on Cub

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Gale Roberts

09-24-2007 23:35:05




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I replaced points, condensor and rotor on the J-4 Magneto on my 1948 Cub. I replaced it on tractor after retiming it as shown in the manual. It now starts very hard and when it does start it seems to be running with retarded spark timing. the points are set at .013 and plugs at .023. the rotor is installed with the line on the rotor lining up with the line on the rotor drive gear.the engine was turned to TDC on compression stroke on no 1 cylinder and the rotor lined up with no 1 spark plug wire on the cap. I then turned engine one complete revolution to the timing mark for top dead center and then pulled the magneto away from the engine until impulse coupler just clicked and tightened it in that position. what can be my problem?? Thanks for any answer on this. Gale Roberts wb9rww@wmconnect.com Clyman, WI

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Haas

09-25-2007 18:32:23




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 Re: J-4 Magneto on Cub in reply to Gale Roberts, 09-24-2007 23:35:05  
Do you have solid copper plug wires. The Mags and older ignitions don't do well with the modern spark suppression plug wires.



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Bob

09-25-2007 04:47:01




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 Re: J-4 Magneto on Cub in reply to Gale Roberts, 09-24-2007 23:35:05  
When does it spark when slowly cranked to #1 TDC? (In other words, did you go back and verify that the impluse is ACTUALLY tripping at TDC?)

Also, are you SURE all 4 plug wires are correctly installed, around the cap, in firing order? It is possible 2 are swapped around.



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El Toro

09-25-2007 04:13:57




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 Re: J-4 Magneto on Cub in reply to Gale Roberts, 09-24-2007 23:35:05  
When you have the engine running pull one of the plug wires off to see what the spark looks like.
It should have a hot blue spark. The coil may be weak if its a yellow spark. Hal



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