McCulloch BP1 Runs too good. I acquired a BP1 a while a go along with a assortment of other chainsaws. I finally decided to do something with these guys. So i am starting with the BP1. First I took it apart and cleaned it up. Reassembled it with no problem. The thing started on about the 12th pull. Great!!! Now for my problem it went to full throttle and stayed there. (love the sound). I looked down the carburetor throat and the butterfly was closed all the way. How is it i get full throttle when the carburetor butterfly was at idle position. I figure there must be some sort of way the thing is getting air to run, any ideas? I did not disassemble the cylinder part of the engine.