I think that 3 thousandths of difference in point gap yields ABOUT 10 degrees difference in dwell angle.
I am sure 10 degrees difference in dwell angle produces a 20 degree difference in timing. This is due to the crank revolving twice the rate of the cam.
I have a K181 on a Troy-Built tiller. I time it with a light and when it is right, the points are tighter than the book specs. I can USUALLY start it with one rope pull if I am able to finesse the choke correctly with the other hand.
The numbers I stated above may be off somewhat, but I think they are very close. If you get a light you will have plenty of adjustment room at the points to get it timed correctly.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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