RE: Can't Get new Enging to Turn Over
The cylinder in the OS has a taper and gets smaller at the top. The reason for this is that the top of the cyl gets hotter than the bottom and expands more, so at running temp it's basically straight. They need the temp at the top for break-in, and too rich a mixture wont get it there. Also the Alum piston expands more than the cyl at any given temp so what it tight now will get real bad if run too rich as the cyl cools better than the piston, the result is a low performing engine at best, a broken rod or crank at worst. I suggest you do not allow the engine to run in 4-stroke mode for any length of time.