Hello, drive a Penta-Dakarino 2stroke 50cc terrain-maschiene Bj.96 (3.5KW with 7000upm water-cooled motor membrane controlled) and want to make it a little faster. The original carburetor is a Bing with the designation 17/15/116 with a 60s main nozzle. It has 4 gears and the strange thing about it is when I drive in the 3rd course on the straight line it comes at once over its normal speed band and goes like Schmitz-cat (turns also a whole corner more without any problems). Then switch to the 4th course, it no longer pulls, but rather slows down. What can I do now that the mashiene gets a bit faster. A buddy of me said that it is on the carburettor since it would not bring any more.Have already tried with a larger nozzle (65 and 70) then it runs slightly better in the passage, however, at the end speed worse.What can I do now????? bigger carburettor 19er or something like?????. Motor(it is a Morini GS FM type) because there is no more dén manufacturer. Many already for your trouble. MFG Peter