I bought this Yz400f a few days ago knowing it had issues... Right now its not sucking any gas from the carb whatsoever, i took the carb apart and cleaned anything and everything i could think of but still nothing. Plus the only way i can get the accelerator pump to squirt at all from the nozzle in the intake is if i maually use the rod. It feels like it has plenty of compression but i think it needs some new shims for the valves cuz its pushing some air out the intake. The vertical line for timing on the crankshaft looks like its been sanded off so i took out the spark plug and put a straw on top of the piston to find TDC and it ended up being to the right of the H on the crankshaft so i timed it from that spot. The only time i got it to start just for a second was when i used a spray nozzle from an air compressor and put it on the part on the carb where the line from the tank goes to spray some fuel through the accelerator pump nozzle in the intake into the engine. PLEASE HELP ME!!