MatT I am think of doing the same thing too. I plan on blueprinting the case. Making all the ports line up exactly an polishing the whole intake side. I feel the only problem w/ the sachs engines are they are asthmatic.
Well and I need a new carb and the bigger bing is lot cheaper than the stock. I keep saying this.. if kriedler made a 14hp 50cc engine to set a land speed record than I should be able to get at least 5hp out of the little sachs case.
This winter will be a cuss fest in my basement.