Did you try shooting a little oil in the cylinders? Back in my circle track days, one engine I rebuilt would not start. It ended up that when I first tried to start it, it flooded out & washed the oil off of the cylinder walls. Someone told me to take a oil can & give it a couple of shots in each cylinder. After I did that, it fired right off. Might be worth a try.:?Update: --- Could engine compression be that low that it wouldn't run at all? I just find that hard to believe! If it ran rough I would understand. Hate to give up on a bike due to the company's negligence!