Re: Re: Re: Spark Plug Fouling

Posted by Steve - IN on April 05, 2003 at 19:53:27 from (12.222.31.186):

In Reply to: Re: Re: Spark Plug Fouling posted by Ken Crisman on April 05, 2003 at 18:55:00:

Ken,

Two things -

1. It depends on how you run the tractor as to whether the 1 hotter plug will hurt anything. If it's really worked hard, you want a colder plug. But if you use it for light work, or just fooling around, the hotter plug should be OK.

2. If you're sure there is no oil fouling in that cylinder, it could be just running rich on that one cylinder. Guessing you have an inline 4 engine. If so, most inline 4 designs run the center 2 cylinders richer than the outer two by design in the carb and/or the intake manifold. Reason is cooling -- rich runs cool, lean runs hot. The center 2 never have as much cooling as the outer 2 cylinders. So it's wise to run them richer. Rich also fouls plugs. So the setup is an optimum, not a maximum. Changing plugs by a 1 step or so in heat range isn't going to throw things over the edge, just be aware of what you're doing and why you're doing it, and check on the results you're getting. The first thing to fail or suffer in a combustion chamber that's too hot will be the plug itself. Second thing is the exhaust valve. Keep a close check on them and you should be OK.

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