If you have the two piece cam then it is a timing advance cam not a ACR cam. The timing advance cam has the fly weights on one side of the gear and the ACR cam has the fly weights on the other side ( lobe side ). With the timing advance cam, the points should be set on the "T" ( on fly wheel) whereas with the ACR cam it should be set on the "S". I just went through this ordeal with my 100, very hard starting, check out my thread ( ACR questions). I got a used ACR cam out of a 102 and swapped them and just got it put back together tonight, fired right off, couldn't be happier!
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"O", 100, 129, 149, 169
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