I have an issue with a KAD44 that I purchased & overhauled. The supercharger will only engage when reverse gear is selected. If the throttle is shifted to the ahead position the blower will not cut in @1500rpm & disengage @2700rpm. I can still reach max rpm in fwd though. I have tried re calibrating the throttle, I have tried changing the gear shift actuator and have tried different cables to the helm. The boat is on a trailer at the moment. Any help would be appreciated.