i bought a hustler z this spring and so far have been very pleased with it. i have sold 4 to other grass mowers for the local dealers if that tells you anything! the question i have is about the 23 horse kawi. it started surging at about 40 hrs. and the dealer cleaned, and then replaced the carb. problem fixed... or not. now i can only engauge the blades at full throttle or the motor dies out. i hate to have to continue full rpm engaugement. any ideas?