pulsing engine sound at highway speeds

[molly]

Hi everyone. First post here. Bought a GZ 250 on 6-15-07....2006 model, but new. (still on the showroom floor) I LOVE the bike! Rode it yesterday and again today, about 20 miles each time. I am a very new rider, so today was alot more relaxed than yesterday. Anyhow, during the ride today i noticed a pulsing sound that came from the engine when i was up to 40-55 mph. There was NO power loss or surging of the engine itself. Everything felt fine...just this strangely faint pulsating sound. Will get the bike checked by dealer, as it has a warranty, but was wondering if anyone has had this experience with their bikes. Any ideas or suggestions will be greatly appreciated.