The problem i have is this, the butterflies on the throttle bodies are have free movement. The ski starts perfectly. When its cracked wide open it reaches about 10000 rpm and when you let off on the throttle it drops to 5000rpm and stays there, just slowly decreasing in rpm after letting off on the throttle. (In the shop with no load) If the machine is shut off and then restarted, it starts perfectly again. There are two butterflies that are slow closing.