Hi:
In my ryobi I used a Robart 1/8 "T" plastic coupler to use fuel from the carb line trough the priming bulb to first start the engine, No problem with that.

How much can I reduce the high of the cylinder to raise compresion, The ryobi has a gasket around 1mm thick and I think that remoe it could be too much...

Thanks
tato.