Re: 1940s OMC / Johnson breaker points question

[legendre]

quote Jeff Register:

I find the Johnson service manual incomplete as well1

So I’m not the only one who has noticed some inconsistencies..

And I also find the whole idea of setting the radiused end of the pushrod against the moving contact to be weird. I’d think the radius would run much more smoothly against the points cam, while the flat, squared-off end should be perfectly fine pushing on the points contact.

Doesn’t the cam tend to wear the flat end to an angle?? If it did, and the rod happened to rotate, it would change the timing! Just think about it for a moment.. leading vs. trailing edge of a beveled cam follower..

Not trying to start an argument, more that I’d like to understand the engineering theory behind this design decision.