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I picked up this bike for my nephew and haven't been able to get it to pop even once. The previous owner told me the bike ran great but became hard to start warm then hard to start at all. The exhaust washer was already removed, as was the oil pump. The start/run/off switch was replaced with a kill switch. I thought that may be the problem after getting intermittent spark but traced the wires and found one to be grounding out. I wrapped it up and that solved my spark issue. I tested the electrical components per the manual and all checked out. As far as I can tell the electrical is not the problem. I pulled the carb off and went through it completely. The needle isn't worn, float height is correct, the jets are clear, oil inlet is plugged and the clamp is tight. Tried recommended screw adjustments as well as adjustments before the tear-down. The reed valves were not bent so I cleaned 'em up and put 'em back in. I replaced the plug, then replaced it again, hoping maybe I got a bad one. Not the problem still. Dumped a little gas in the cylinder, nothing, not even a pop. Got a little brave and tried some ether, still nothing. The exhaust is clear, hardly any build-up, and the compression is about 120psi. I checked the stupid stuff like the fuel being off and the kill switch being on. I was told the crank seals could be bad but wanted to check every thing else first. The air cleaner seems a bit dirty, I plan on picking up a new one, but would that keep it from firing whether the element is on or off? Is there anything I missed as to why this wont run? And whats involved should I have to split the case?