[fivepin]

What services have you had done to it? This sounds like it could be multiple problems, anything from your cams not getting proper lubrication, or your trany. This is what i would like you to do, start the bike up and listin to the noise. Get close the loudest point and see where it is. The chain tensioner could be the problem being to tight or way to loose. If it is a grinding noise it might be in your trany. The cam chain would be making a ticking noise (loose or tight). what you can do for now is pull your valve cover and check you chain and cam for any wear or signs of heat damage, it will be very noticable. If that isnt the problem its time to start going down the list of posible problems.