I have a 2010 z1000 i bought a couple months ago, has abouit 800 miles. I can hear a noise coming from the engine when the clutch is engaged, i noticed it when taking off and the bike was in neutral. The noise goes away when I pull the clutch in. It isnt a clunk or vibration, its sounds kinda like the hum of a fan. Anyone know if this is normal? Thanks.