Original/correct advance springs for old tractor distributors are nearly impossible to find anymore.
The alternative is to go to an on-line hod-rod supplier such as Summit Racing, Jegs, etc., and buy a generic distributor advance kit" or "distributor re-curve kit" containing an assortment of advance springs, use the ones most like the original in strength and length, then verify the advance is operating correctly using a timing light, swapping springs if it advance too early or too late.
Ideally, one would use a "distributor machine" and have an OEM advance curve spec. sheet at hand, but you are dealing with a relatively low RPM low compression engine and in this case "close" is probably good enough, and certainly better than before you worked on the distributor.
Also, there's lots of videos out there from guys "re-curving" distributors and probably some helpful tips, as well.
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Today's Featured Article - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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