Re: Re: Re: Re: SPARK PROBLEMS, I dare you to explain this one!
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Posted by Lee Bradley on June 21, 1998 at 08:36:10:
In Reply to: Re: Re: Re: SPARK PROBLEMS, I dare you to explain this one! posted by Gary Mac on June 20, 1998 at 21:49:04:
: These guys have it right. Either you have a bad plug, a bad wire, or a bad cap on the mag. Another possability is you have the mixture set too rich and the engine is getting too much fuel to burn with the available spark. As someone said pulling the wire and letting the spart arc creates a stronger spark at the plug. You should be able to arc the wires on the cylenders individually and find the one that is missing, or take the plugs out and find the one that is black or fouled. :
: : First of all don't go putting any resistors on your spark plugs and if possible stay away from the guy that told you that. You should be using a Champion D21 plug . I would start a process of elimination by changing a plug at a time then a wire at a time and so on. One thing that has given me absolute fits in the past, especially on a magneto, is the carbon core automotive wires. Ceck all the wires and make sure they are steel core wires. John Good advice on most all these posts. I agree that there is no point in going to resistor plugs unless you're getting static on you're tractor's radio. I will assume that you checked plugs and compression before you started replacing ingition parts. The possibility is that you have a lean mixture on one or more cylinders and the hotter (higher voltage) spark is able to fire the leaner mixture. Possibilities for lean mixture carb is slightly lean and cylinders on the longest manifold runners lean out, a slight vaccum leak in the manifold/manifold gasket, dirty valve, worn valve train (valve springs, cam lobes, etc).
Good luck,
Lee
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