I have a Ryker 600 Ace with about 600 miles on it. It runs great!

However after the last couple of runs of only 10/15 miles I hear a high pitched whine when the engine is idling (don't think it was there before).

I think the sound remains but the sound of the engine is louder so don't hear it when moving.

Does this sound normal?

I would appreciate any feedback on this.

Thanks.