Well I'm frustrated as h***. Throttle sticks in position or returns to idle very slowly. Just replaced the throttle cable, cleaned and greased the throttle housing twice, throttle tube is is good shape as far as I can tell (no wearing, no cracks). Even removed the grip to make sure it wasn't causing the problem and trying sanding the tube (area that is covered by housing) with very fine sand paper to make it smooth. Any sugestions would be great appreciated, I'm going crazy try to fix this thing.