Simson turns slowly?
Hi, I just rebuilt the engine of my S51 (with a 60cc cylinder), and now I'm having the following problem: I always have to give it full throttle when I start it, but when I give it full throttle, it only runs at very low revs. Before, it ran normally for a short time. When I adjust the carburetor screws, nothing really happens. This happens even when it's warm.
Look if the gasoline supply is somehow disabled or something. If everything fits, try out other main nozzles and the problem should be solved. There’s enough nozzle kits with different sizes, just try.
Sounds like she’s running too fat and draining. What are you doing in the carburetor?