Might be an idea to change the fork oil, you will have to find out (get a manual) how to do it, what viscosity and how much to use, this doesn't need doing very often but its an old bike and you don't know when it was last done. brake fluid should also be changed just as it does in a car from time to time. You should use your clutch all the time for gear changing...Tip...when down shifting (only) give the throttle a little blip as you pull the clutch and simultaneously change gear, you will find it is much smoother that way.