I run a tractor Dyno for money and fun so i see the slite differances changes make.
The older cubs that were rated at 9.8 hp were factory set at "said" rpm. Now turn them up 2-3 hundred rpm and watch the differance. Look at the NE specs for the newer ones . There is also other factors here, but point being it's still just a C-60.
My point is you can't here the differance. I just did a tune up on a little Massey a few weeks ago and timed it this way with great results , there able to brush hog with less rpm .
The rpm effects the advance weights inside the dist. The springs from the factory are "very" heavy and i'm not really sure at what rpm they open if at all.
I put chevy recurve kit springs in my dists to get the advance open sooner. [light] on the Super M.
Take the time to try it this way, you will be happy with the results. You can buy timing lights on line cheap that have the Tach feature just make sure it is digital.
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