Re: 1956 Oliver 5.5 hp won’t start

[jasonh]

I believe that what Frank is saying is that reed block is machined so that the end of block seals with center main cap. If they don’t seal well, the crankcase pressure for each cylinder fights each other. One major principle of a 2 stroke is you need proper crankcase pressure.

As Frank said, take o-ring out and measure gap between intake flange and crankcase. With o-ring in place you need to achieve same gap.

I have seen these with and without gaskets in between end of reed block and center main.