So it had been a few years since it ran. I had done a 450 cam swap a few years ago, it was not running great but got stuffed in the garage while I recuperated from back surgery. 3 months ago I tore back into it. Rebuilt carb with moose kit. New oem valves, springs, timing chain, head needed one exhaust valve guide repaired by millennium, wiseco piston, cylinder swap from millennium as well. Adjusted valve clearance/shimmed up. 2003 450 exhaust cam 14 pins from intake cam. Good compression, new plug with appropriate gap, good spark. Turned on fuel petcock gas poured from overflow. Kicked until my foot was sore, backfired once but nothing. This morning turn on fuel, nothing pours from overflow, still won't start. Sweaty, sore,aggravated, losing patience and bleeding cash. Calling our favorite super hero gray racer to the rescue.