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What I am saying is if you set a small spring to work midway, It will stretch in a short time and the settings will go to pot !.I should have also mentioned that David T is running a single plug new BT-H, so a very typical ignition. The piston was changed to a 10.5:1 and the subsequent dyno run set the ignition at 28 degrees.
Many racers run at full advance, including me, but I could not tell you that it is hard on the engine from the performance.
I avoided mentioning ATD's because I think it can be a problem with no good answer, but it is interesting to see how owners deal with it.
Bill, you are good on that 64 mph at 4000. Of course, maybe never getting to full advance is a good thing!
I don't like ATD s, I prefer the "D" type distributor, But that also has springs, When I was running 12 to 1 s
and wanted 24 degrees, I just put a plastic tube over the shaft to stop the bob weights shutting fully, It worked well. As I have said, My Comet has Manual advance, And I have played with the lever at all speeds, But once over 2000 ish it's best left alone.
I think theses are old bikes and as a rule work well. Cheers Bill.