I just purchased a old M700. It was at some point repowered and no longer has the wisconsin engine. It has a problem where it will drag the rpms down to the point of dying when using the hydraulics or forward and reverse movement. but will snap back to full throttle as soon as you let off the controls. you can barely move the controls and it happens. Also I'm new to the forum and to these machine. Also is there a diagram for the controls for these around somewhere. Thanks