Darn this Honda and it's complicated exhaust valve setup. Usually, the valve quits working in the closed position and after I messed with something. Today, it quit randomly in the half open position. It continued to open fully as the revs increased, but never closed past half. I adjusted it so it would close, but now it wont open past half. It seems I suddenly lost half the travel of my power valve mechanism. I will be pulling the right side cover to inspect the governor tommorow. Anybody have any input? This is the 87 CR 250. The power is just a little hard to control at the moment.