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I would say for the 40s/50s/60s vintage magnetos, a lot are in the .18 to .22 range. Cannot really go wrong with .20 uf.
As the motors vintage gets earlier, the uf rating vary.
30s vintage motors average more in the .4 uf range (.36 to .44) These include the P30,P35, P40, P45, PR40, TR40, etc…. and Evinrude counterparts
Motors slightly older than that, such as the A35, A45, VR45, and the like had roughly a .3 uf rating (.27 to .33), and Evinrude counterparts Big Four, Speedi Twin, 460.
Very early motors, such as the A, A25, J25 had a much lower uf rating, as low as .09, but most I have tested are around .12, Evinrude counterparts Ace, Pal, Ranger, Cub, etc…
Mercs and Martins are all around .16 to .21
Olivers slightly lower at .13 to .17
Call me a weirdo, but I have a pretty good collection of condensors. Don’t ask me why. Also like to collect Magneto testing equipment, and manuals.
My wife wants to lock me up.