My pal has a YS91 and he stripped the engine and did a rebuild properly. We tried to run the engine today and had some problems. The engine is turning an APC 14x10 and runs on Cool Power. We set the high end up and then moved to the low and mid. The engine will run fine with the throttle wide open and it will idle but when you throttle between 20% to 60% there is almost no response, only response we noted was the engine wants to die ... its like an electric engine running out of juice. There is no gurgling ...

If you push the throttle fast then when you hit 60% or more the engine will pick up again ... no sputtering at all. Its like running an electric motor. We tried to richen and lean up the regulator to no avail.

We need help!!! SOS!!! THANKS!!!