Posted by Roger46 on August 01, 2010 at 10:35:04 from (75.221.226.167):
Last week I posted a message about my Cub that wouldn't start after being at the Wisc Farm Tech Days. It had spark, gas, and compression, but would not fire. I finally discovered that it didn't have sufficient spark. It turns out that the magneto got wet inside the coil area as well as the top cap. The only way I was able to completely dry it out was to heat up the magneto with a heat gun and put the top cap in the oven (wife not real happy about) for about an hour. It is an old top cap and must be bakelite as it seems to have absorbed water; because I first dried it with the heat gun, but it became wet inside again after sitting overnight. Also, I discovered that the tang inside that contacts the coil was broken and not making good contact with the coil. Fixing that and drying it out, the Cub fires right up. I was surprised that it wouldn't run with the spark it had, but must not have been enough. I did what someone had suggested and opened the gap on a sparkplug to about 1/8 inch and it wouldn't fire, but my Farmall B magneto would easily fire across that gap. Thanks for the suggestions. Roger
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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