I recently bought an 81 440 LTD. It has 8000 original miles and I am in love with riding this bike. I do not know what has been done to the bike by previous owners. (ie..gear changes and such) Just wondering what the normal cruising RPM is for this bike. I feel like mine is turning to many RPMĀ“s running 70 mph on the interstate and might decide to change the rear sprocket. Just wanting other owners input.