Guys,     I’ve been stumped with trying to figure out the correct points setting for the magneto on my 1952  16hp Elgin.  There are two magneto designs, 26A- old stye  & 26B – new style, mine is the 26B.  According to what I’ve been told you are supposed to set the points gap at the low side of the cam with the feeler gauge between the fiber point arm and the low side ! One problem is I wasn’t told what measurement feeler gauge to use ?  According to the mag plate, it says set points gap at .020, If I use that dimension and then rotate the crankshaft to the hi side of the cam, the points are only open .009 – .010  ?

In the picture of the two types of ignitions the 26B says the gap is to be between the low side of the cam and the fiber points arm and is the important measurement but no mention of what that measurement should be ?  It also says to disregard the punch mark which is for the 26A ignition !

If you look at the fiber arm on the 26B and where the contacts are in relation to the pivot point on the arm, it appears it is about 1/2 the distance from where the fiber arm contacts the cam!  To me this is why the points only open the .009 – 0.010 when set at .020 between the fiber arm and the low side of the cam !  But it counters what is printed on the mag plate, which is (set points at .020)    If anyone can straighten this puzzle out for me I would greatly appreciate it !

I have tried setting the points both ways, one at the low side of the cam and one at the hi side where the punch mark is and both setting produced a good healthy spark !

Thanks

Gary