Join Date: Aug 2012
Motorcycle: '99 GSX-R750-SOLD for '13 Kawasaki KLR-650
Re: Strange engine noise
Did you take his advice with the salt, or hit him with it? I would have recommended both.
If it changes in pitch immediately in sync with the engine as you rev it, it's mechanically driven- alternator, timing chain (both of which you checked), water pump, oil pump, or possibly even a vacuum leak sometimes, though those typically lag a little bit behind the mechanical parts noises, at least on car sized engines.
If it changes a bit, but lags behind the engine a little bit, see if it changes pitch when you go from all lights off to brights on when the bike's rpms are stable- for example, rev it to 2 to 3k, hold it steady, and toggle the high beams while listening for a pitch change.
If it changes in time with you hitting the brights, then it's gotta be an electric motor. Only ones on a bike are the fan and the fuel pump. If it turns out to be none of those, congratulations! You've caught a gremlin.
Welp, about to piss on over to the KLR adventure forum due to a change of steed. When I can afford a good GSX-R, I'll be back- I don't have time for fixing rat bikes anymore.