- Dec 16, 2006
my 81 yz250 will not even fire. here what I know for sure. the carb is good because I tried it on another bike, the spark plug has nice blue spark set at .025 , timing mark is at tdc, the spark plug gets wet with gas, feels like it has good compression, I have not inspected the reeds yet, they looked ok when looking in from intake boot. but if the spark plug gets wet it should at least fire, backfire, anything. one thing I just thought of, does this bike have a woodruff key? if it does and it gets sheared will it still have spark? thanks for any advice.