Cub Timing Problems

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Re: Cub Timing Problems

Postby Eugene » Mon Mar 25, 2013 2:46 pm

Trace the wires from the magneto distributor cap tower all the way to each spark plug. It's easy to get the wires mixed up. Since the tractor runs and you had to swap wires around to get tractor to run satisfactorily - I think you had a wiring mix up problem.

Everything else sounds correct from your description, except for not static timing the magneto/engine
I have an excuse. CRS.
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Re: Cub Timing Problems

Postby apprentice » Mon Mar 25, 2013 2:52 pm

Ok. As far as the static timing. I did that and it trips when pointer is aligned to pully notch. Im talking about the mag. I'll check wires agian. But I have my doubts.
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Re: Cub Timing Problems

Postby Wakulla Bill » Tue Mar 26, 2013 8:48 pm

Was surfing through Rudi's manual server and came across this, thought it might help you.
http://www.cleancomputes.com/Cub/Mainte ... Timing.htm
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Re: Cub Timing Problems

Postby apprentice » Tue Mar 26, 2013 9:07 pm

Thankyou. Everything im doing is the way I have a always timed an engine. I never had this much trouble. It runs great but I know it aint right with. The wiring. Think I'll wakk away fir a while.
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Re: Cub Timing Problems

Postby Rick Spivey » Wed Mar 27, 2013 5:16 am

I understand walking away, because sometimes we just need to clear our head and take a fresh look. The firing order is 1342; If you told us you had to move all 4 wires over one notch to get it to run right, we would know that something was slightly out of alignment. But when you say you have to switch wires 1 and 2....the Cub wouldn't actually run correctly. That is not possible that someone changed the firing order on your cub to 2341....so the wires have to be crossed. Are the wires in good shape, I heard (what may be an urban legend) about the spark actually crossing over to the path of least resistance, and firing the wrong plug once. But I don't think that could actually swap two cylinders, you'd just be firing one of them twice. Look very hard at the wire routing and condition, and you will solve this mystery.
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Re: Cub Timing Problems

Postby Eugene » Wed Mar 27, 2013 8:58 am

One more thought. Plug wires need to be wire cored on magnetos and not the carbon impregnated fiber type.
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Re: Cub Timing Problems

Postby apprentice » Wed Mar 27, 2013 9:02 am

I have heard that. What kind of difference would they make? They were whatever Napa had.
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Re: Cub Timing Problems

Postby Eugene » Wed Mar 27, 2013 9:03 am

One more thought. Plug wires need to be wire cored on magnetos and not the carbon impregnated fiber type.

Edit: Since engine runs - good or sorta good - and ignition timing is close or right on - conduct some other diagnostic tests. Compression and vacuum.

What is the history on this tractor? Should have asked earlier.
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Re: Cub Timing Problems

Postby apprentice » Wed Mar 27, 2013 9:06 am

Vacume? On an updraft carb? No place to plug in a gauge.
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Re: Cub Timing Problems

Postby Rudi » Wed Mar 27, 2013 9:31 am

No place on the carb but the manifold has a plug that is used for milking machines...

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