So lately my BR 550 backback blower has been hard to start and not been able to run full throttle. Finally had a chance to bring it to the dealer for a few days and they thought they had it fixed but still doesn't run hardly at all. Can only run it about about half throttle if that. The dealer is stumped also. A key note is that when the choke is on it runs fine but you can't run the choke and blow the same time cs the choke kicks off when you hit the throttle. So to me that means its not picking up fuel. The dealer recommended trying to back out the carb ajustment to allow for more fuel but still doesn't help. Does anyone know of anything??