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Cub timing

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Bandit~

09-06-2000 18:11:32




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I own a 1950 Farmal Cub. About 12 years ago, i had the magneto replaced with a distributor. I am now sorry i did so because ever since then it has gone out of time at least 1 or more times a year, this year it has gone out of time twice. Does anyone have an explaination for this. Is it the distributor that is causeing this problem, or am i overlooking someithing. I am contemplating changing back to a magneto if this would correct the problem. any suggestions plz?

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p

09-07-2000 12:52:11




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 Re: Cub timing in reply to Bandit~, 09-06-2000 18:11:32  
In what way is it going out of time? Is it very far out?

The Cub distributor has two hold downs stock, does your have both of them. If not then it could be vibrating.

If in fact it is actually going out of time, then you may need to pull the distributor apart and see what is loose, but I have never heard of such a thing. I would think that if something was that worn it would just break and not slowly slip.

Are you sure you don't have a ton of play in the gears driving the distributor. If so, you are actually never attaining an accurate reading on the timing. I guess I would pull off the distributor cap and put the tractor in 3rd. gear. Have someone push the tractor forward(preferably with the spark plugs out) until the rotor spins. Then move the tractor in reverse. Allow alittle slop for the drivetrain(so watch the fan move) and see if there is a ton of rotation of the motor until the rotor spins. This would not work for a magneto because of the impulse, but it should work for the distributor. This technique will not tell you what is wrong but may help Identify whether you have a ton of slop somewhere. Someone correct me if you disagree with this method. I am just giving ideas....

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p

09-07-2000 12:51:18




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 Re: Cub timing in reply to Bandit~, 09-06-2000 18:11:32  
In what way is it going out of time? Is it very far out?

The Cub distributor has two hold downs stock, does your have both of them. If not then it could be vibrating.

If in fact it is actually going out of time, then you may need to pull the distributor apart and see what is loose, but I have never heard of such a thing. I would think that if something was that worn it would just break and not slowly slip.

Are you sure you don't have a ton of play in the gears driving the distributor. If so, you are actually never attaining an accurate reading on the timing. I guess I would pull off the distributor cap and put the tractor in 3rd. gear. Have someone push the tractor forward(preferably with the spark plugs out) until the rotor spins. Then move the tractor in reverse. Allow alittle slop for the drivetrain(so watch the fan move) and see if there is a ton of rotation of the motor until the rotor spins. This would not work for a magneto because of the impulse, but it should work for the distributor. This technique will not tell you what is wrong but may help Identify whether you have a ton of slop somewhere. Someone correct me if you disagree with this method. I am just giving ideas....

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Glenn

09-06-2000 19:58:13




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 Re: Cub timing in reply to Bandit~, 09-06-2000 18:11:32  
I am not very knowledgeable about distributor drive systems, but could it be possible that you have a worn or stripped distributor drive gear?



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