Are you sure the coil is not the source of your problem? Coils can be checked with an ohmmeter or commercial tester. Why not use an in-line spark tester and observe the spark when the engine is running?? First make sure your plug wires are the original, metal core type; the carbon core ones don't work very well on tractors. Second, find a piece of clear plastic tubing (about 1/4" I.D. and 2" long), then cut a piece of plug wire long enough to go between the coil and the center tower of the distributor cap and cut it in half. Slide the ends of the cut wire into the tubing until they meet in the center. Replace the coil to distributor wire with your new "diagnostic tool" and start the engine. Gradually increase the wire end gap to determine the spark quality. You should be able to easily see if the spark is bright blue and steady indicating all is well. A good system will probably jump a 1/4" or better gap. the spark should be bright blue & "snappy". This really looks "cool" in a dark shed or at night!! This will work on either a magneto or battery operated distributor if the coil wire is accessible. You can also try one spark plug wire at a time as a cylinder diagnostic tool. Try it and amaze your friends with your "electrical diagnostic tool" all for about $1.00 or less.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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