I inherited a Troy Bilt Chipper Shredder, Model # 11390 w/ a B&S 8 HP motor.

1. It takes 5 or 6 attempts to engage the hammers, no matter how slow I move the clutch lever. I move the lever like honey in January and it still bogs down the engine and usually stalls. I have let the engine warm up for 3 or 4 minutes, the carb was rebuilt last summer, fuel is fresh, air filter is new... not sure what to do. Its designed to run at high rpms and there is no throttle adjustment. As the engine slows, it appears that the governor regulates the engine and increases rpms when there is load from the chipper. Any ideas / suggestions?

2. Anyone know the proper belt for this machine (generic is fine)?

Thanks.