Ive noticed over the past 3 weeks or so that my bike makes a "whine" or "howl" sound when i get above, say 30kph, up until 70 or 80 where either it goes away or I just cant hear it anymore due to the wind noise.
The noise is definitely association with forward motion and/or drivetrain as it goes away wen I pull in the clutch. The sound minimizes when I "level off" on the throttle (
momentum catches up to RPM?). it also increases and decreases like a "see-saw" effect or "throbbing" as I roll off the throttle completely and the engine catches "down" to "momentum" or coasting level. I think everybody knows the kinda sound I mean, nearest word to describe is "howly-whine".
What think ye?... Tranny?...Chain/Sprockets?....clutch? Ive got 26000 k's on the bike and the chain and sprockets were replaced at 18000k's, same time as the tires.
Chain seems ok, not too loose or too tight, got about an 5/8 inch of play in it when I sit on the bike.
My one thought was the kind of oil I used for a whie, the PTFE/moly stuff from honda (red can) Teflon base, seemed ok, but seemed dry
.