lads i have a 2stoke engine kit on a montain bike had her out last week drivin grand went goin up a hill i changed rear derauleer to 1st and it swung in and got caugh in back wheel so i took of derauleer and shortened chain and left in in 3 rd on bak cluster bike wudnt start as if engine blocked wont even wheel now. even with plug out, how is this ? any help is appreciated lads