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720 pony

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Denny

03-17-2002 11:33:15




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I am having trouble getting spark on my pony motor. I think the switch may have been left on. Also could be I had the batt charger on 12v when I turned it on. Where does one start to look for the problem? Are these motors hard to work on? Thanks for any help. Denny




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Frank-in-Tallahassee

03-17-2002 13:18:23




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 Re: 720 pony in reply to Denny, 03-17-2002 11:33:15  
Denny:

If those little coils saw 12 V. they could be easily cooked. Also, if the switch was left on, they can overheat and burn out on 6V. There is a dropping resistor on the back of the switch that's drops the voltage I think to around 5 V or less. The distributor gets full battery voltage while cranking by way of an extra contact on the starter switch.

Start by seeing if you have power to the distributor lead that's on that dash side terminal of the pony distributor. Check it switch on and while cranking. That way you can be sure you have power under both circumstances.

If so, with power on, break the points, one side then the other to see if they have power. Also check for clean connections on the condensers and such. If that checks out, then you 'll check for high-tension at a spark plug wire.

The pony distributor is very simple. No advance mechanism at all. It's actually two separate two cylinder systems. The parts can be pretty pricey. When I began to resurrect this old 70D of mine, I bought a complete distributor do-it-yourself kit and it was $ 165.00, but included everything but the cover and back plate.

Let's hope the coils aren't dead. They're around $55.00 a piece aftermarket.

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Dale West

03-17-2002 15:55:44




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 Re: Re: 720 pony in reply to Frank-in-Tallahassee, 03-17-2002 13:18:23  
If you left the switch on, it more than likely fried one or both of the coils. $55 after market is cheap, as they are $176.00 each from John Deere. I went through this about a year and a half ago. Dale



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