In the past few days my bike has started riding different. Instead of having a constant sound it now sounds like its cycling. Doesnt do it when idling and i even feel the movement and not just the sound. I first brought it to a mechanic and he said the chain was too loose. He tightened it and the effect of the cycling was less but still there. Then the chain began to make a noise like a winding noise. I assume its the chain since that was the only adjustment done to the bike. Another guy says i need to get the bike resync'd and jetted. He tells me my chain is fine. The first mechanic said the chain may break and i need to replace it soon. Tightening the chain made it run better but i still have the problem with it cycling and its noiser now and not as smooth at higher speeds. I believe the noise is just the chain winding goin really fast. Im not experienced with this so if i explained it poorly i apologize. But ANY help would be appreciated. I got 2 different opinions and i dont have extra money to spend on stuff that doesnt need to be fixed. Anyone ever have a problem similar to this?? Ask specific questions and i may be able to explain more... I have a 91 CBR F2. Thanks for the help.