I had the same thing happen on my 1450.It rocked and knocked and then just quit.I actually thought it blew up.Took the head off,nothing wrong there,took the oil pan off,nothing wrong there.After much head-scratching,I found that the wire attaching to the points had broken off at the terminal where it attaches to the points.I fixed that,de-carboned the head,piston and valves,put it back together with new gaskets,and much to my satisfaction,it ran great!What a relief!!!!
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