Awhile back I mentioned I needed a replacement engine for my 5hp tiller. It needed to be dual shaft. I had to choose between a Briggs 4 hp dual shaft with a badly scored cylinder (100292 ...) and a Briggs 5hp gear reduction engine (130252 ... ) with a stuck valve & a slightly scored cylinder.
I went with the 5hp, but stole the crank, cam shaft, etc from the 4hp engine. I had to keep the old connecting rod because the wrist pin was smaller on the 4hp engine. The problem is that the 4hp had a shorter crankshaft throw &/or the 5Hp connecting rod is shorter. Either way, the piston stops 1/4" from the top.
Hence, the question: will it run?
I have honed the cylinder, but it is about .003" over with a stock piston and reused the rings that are just in or just out of spec. I lapped the valves while I had it a part. I haven't done a compression test yet, just to keep the guessing interesting. I do have spark.