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Misfiring 9N

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Rick Szalkowski

06-26-2002 18:34:23

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after my 9n gets good and warmed up(30-45 minutes)the engine starts to misfire.got new plugs,wires,points,condenser and radiator.i took out the thermostat to get more time.the plugs always look good and clean burning.any suggestions?

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Dell (WA)

06-26-2002 21:14:02

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Re: misfiring 9N in reply to Rick Szalkowski, 06-26-2002 18:34:23

Rick..... ....this is a classic and happens all the time to newbies. ITS YOUR FRONTMOUNT IGNITION COIL. Takes about 45-60 mins to heat up a bad frontmount ignition coil and then the insulative tar melts and shorts out some turns and suddenly, BAD SPARKIES. and even more amaizing, it "cures" itself overnight. (tar hardens) and starts in the morning.

One of the principle causes of overheated frontmount ignition coils is the "infamious ballast resistor" mounted on the backside of the dashpanel. Many well intentioned but miss-guided shade tree mechanics by-pass the ballast resistor to get hotter sparkies for eazier starting.....well yes, that it does, and the same trick melts the insulative tar and then it won't start or run a'toll. Check it out and make certain you really are using your ballast resistor.

PUT YOUR THERMOSTAT back in. The N-Tractor is designed with a way overcooled radiator system. It won't warm up and burn off the combustion by-products and makes nasty black muck in bottom of oilpan and the muck is acid an eats bearings..... ..Dell

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Rick S.

06-27-2002 18:15:48

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Re: Re: misfiring 9N in reply to Dell (WA), 06-26-2002 21:14:02

thanks for the suggestion.i never bypassed the ballast resistor but sounds like a bad coil to me.

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