I have a micro that has the Yamaha R6 600cc stock gas motor. It ran like a raped ape when i got it and now it won't start. Fuel pump is working. It wants to start with choke held all the way on. Any ideas?

Sounds like starving for fuel did you check the fuel filters

I just went out again and pulled the pump and the gas trickled out of the pump. Going to replace it this afternoon and try again. Fuel filter is clean. Not that it matters but the oil is clean also.

Any suggestions for engine builders to rebuild this motor?

Just replaced fuel pump. Gas is new. Any other ideas?