I replaced the cam shaft last year in the motor. Originally thought it was bad valves so they were reset and lapped also, and I was told the carb was cleaned. Since the repair the motor starts real hard, I hold the throttle in the choke position and then have to bring it to low and it will kick, after doing that 3-4 times it will catch and I have to bring the throttle up real slow or it will die. No power loss once it is running. If I give it a shot of starter fluid it starts right away. Also it doesn't like to idle down very much. It is either a Nikki or Walbro carb and there isn't much for adjustments on it. The Motor is on a Deere STX38.