Need help With Helicopter

I have the Seruphum Aerospace JetFalcon helicopter for 2002 and all is well except that it wants to go nose up at a rapid rate at all times. I am using a flight yoke and there is a way to adjust the pitch but that would screw up the rest of my aircraft and what I'm use to. By nose up I mean I have to push all the way foreward on the yoke just to keep the helicopter level. That just can't be right. My other choppers are fine it's just that one helicopter. I assume there's an adjustment in the aircraft cfg. file but don't know what that would be. Help!! 
