Got a real strange situation goin on, rebuilding a 06 yz 450 for a guy when he brought it to my shop it had no coolant and was burning oil. No big deal. Order the parts new piston, rings and gasket. Go to take the head off and this is where it gets wierd. Line the fly wheel up tdc an the cams are 180 out and yes I probed the engine to ensure tdc. The dots line up on the top an the top of the head on the inside (pointing towards eachother) instead of pointing away. Next I check the valve clearances after rotating them to proper position. The intake valves are set at .22 mm (should be exhaust) and the exhaust was set at .13. The wierd thing is with all this the bike was still running and seemed decent. So I pull the motor apart crosshatch the cylinder install the new piston an gaskets and set the valves to proper clearances an put the timing where it should be. Problem is now the bike wont run. Never seen anything like this before and my brain hurts trying to figure this one out. Why would yhe timing be set like that in the first place as well as the clearances :s ( thr guy bought it used and has no details) and why wont it run when everything is set up proper like every other engine ive built.