I love the honda engines. I have a master's series honda 21 wb with the 5.5 hp. ONly problem I have had is the max rpm setting. I have had it set at least four times since I bought it this spring and it keeps dropping down. Power is not down on the mower, the governor just seems to stretch and the rpms drop. Any idea what to do. I have checked the throttle cable and it isn't slipping, because I can still put it in choke with the throttle.