I have a 99 katana 600,very well maintained.....lately ive been hearing this noise,at first i thought it was my chain.upon inspection i discovered 3 pretty stiff links,though ive been able to free the the noise ive been heaing isnt that loud when i take off from a stop,but as soon as i click to second it gets louder then in third it barely noticable my chain is a 530DID118 link....bout 5yrs old replaced w/sprockets.......the noise ive been hearing is sort of a low-pitch woop woop woop

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I had the same noise it was the timing chain tensioner.
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