I was going to try and get the most power out of a ported 50cc cylinder with a rotary valve and a 28mm pwk nock off carb. Which by the way has got a really high quality for the price of only 18€ including shipping.
The problem why i discontinued the project was that that the new liner fitting inside the old cylinder was way to expensive for me (250€) so now i am going to cast a cylinder in which a cheaper liner fits.
The cylinder is based around the rsa port designe. And is mostly a copy of alex degnes cylinder withe the big radii on the transfers and the ports that bend only in one plane. The post on which I explained how I costructed the rotary valve was called simson 50cc high end tuning.