I have a 2000 Suzuki 1500 LC, I've got a wobble in the front end when I'm going about 30 -40 mph. I've been told that it's fork oil but not sure it has oil in it as it's got springs. Any idea what it could be ? Maybe need the springs replaced?

A wobble that appears when slowing down is many times just low tire pressure. Check the front tire pressure should be 32-35 pds. Another thing that can cause a wobble is worn or loosely adjusted fork frame neck bearings(steering stem bearings). Disassemble around the handlebars down to the frame neck till you get the upper triple clamp off or can reach the adjuster nut , just underneath on top of the frame neck enough to tighten the steering stem bearings. You will need a shock adjusting tool (curved end with a single tooth) Comes standard in all Honda tool kits). Next, put a jack under the motor to lift the front wheel . Carefully wiggle the front wheel to see if you have a bad wheel bearing. If you do not have fork oil in your forks, you could possibly damage the chrome tubes. No oil would mean the forks would not go up and down smoothly. Do not add oil to your forks. Do not over fill your forks with oil. If you are not sure how much oil is in them, drain them and refill them with the correct amount. If you over fill the forks and drive the bike you will destroy the fork tubes.

I had the same problem and it was a bad tire.