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901 ignition/choke problem

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Bill

10-26-2000 07:34:41

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I have a 961 which has been converted from 6 to 12 volt. I recently replaced the points (which had recently been replaced) and when I was using the tractor was only able to make it run with the choke on even when at operating temperature. When I try and take the choke off it will start to die and forces me to pull the choke again. Yesterday it would not start and I had to clean the points which let it start. I seem to remember seeing something somewhere about this type of problem. Can anyone help?

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Drew / Millington, MI

10-27-2000 04:41:46

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Re: 901 ignition/choke problem in reply to Bill, 10-26-2000 07:34:41

Sounds like you have 2 problems. (1) If your condenser is open, that would cause the points to foul rapidly. (2) Possible carb problem -- to lean. Also, have you timed it when you replaced the points? Although I think that it is less likely, I suppose that there could be a relationship between timing that is too advanced and the fact that it runs on a rich mixture. Anyway, I would replace the condenser, clean the points, adjust the carb, time the enigne, then adjust the carb.

- Drew

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Jerry D

10-27-2000 07:26:55

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Re: Re: 901 ignition/choke problem in reply to Drew / Millington, MI, 10-27-2000 04:41:46

In the spirit of KISS, have you checked to see if the gas is flowing freely to the carb? Might have a clogged fuel flow issue that is causing you to have to keep the choke out to keep running. Also, I see that the tractor was converted to 12V, was this recent? Does it have a resistor inline with the coil or a coil that has the internal resistor? That will cause point problems if the fire is to hot!!!

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Drew / Millington, MI

10-29-2000 05:26:46

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Re: Re: Re: 901 ignition/choke problem in reply to Jerry D, 10-27-2000 07:26:55

Jerry, good point about a fuel flow problem.

My thinking is that if the points were recently replaced, the lack of a series resistor in the coil circuit would not cause the points to go bad this quickly. For years, automatic chokes in cars had a switch, an electrical contact connected to the bi-metal strip, that bypassed (shunted) the ballast resistor to deliver a higher voltage to the plugs during start and warm-up. When the choke started to open, the switch would open and the ballast would be back in series with the points. Today, electonic computer controlled ignitions perform the same function of delivering a higher voltage to the plugs during start-up.

Although it would serve to protect the points, the main purpose of the ballast was (is) to extend spark plug life. The purpose of the condenser (capacitor) is to extend point life by damping the arcing between the contacts. The point here is that an open (or other similar fault) condeser will cause the points to fail many times faster than the absence of a ballast resistor.

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Jerry D

10-31-2000 09:43:22

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Re: Re: Re: Re: 901 ignition/choke problem in reply to Drew / Millington, MI, 10-29-2000 05:26:46

Drew is absolutely correct about the condenser damping the arc. This is an excellent suggestion and in the KISS principle is cheap and simple to try. I never change points without changing the condenser since both are spec'd for about the same life span in mobile applications. Let us know what you did to fix it!!!!! !!

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