Training Wheel Hero
Join Date: May 2009
Location: Edmonton, Ab
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Think about this: if the sprocket shaft (i forget proper terminology) is loose from something undoing itself, or more likely from a bearing failed, then that might be an issue. Considering that applying the brake stops the noise, this COULD support my theory... if applying the brake pulls the sprocket shaft (sprocket side) flush with other gears - from the chain yanking on it - then it might indicate a bad bearing.
Also, in reverse motion aren't there parts up into the clutch area, etc... that only function in forward motion? If this is true, it could explain why the reverse motion pulls the sprocket shaft back into place better (the same as when applying the brake).
The fact that you're not on the side of the road as we speak shows that, at any rate, your problem is minor... for now anyways. So maybe consider the/any shaft and the chance that a bearing has been spun. These bad boys are high-rpm units, so it wouldn't surprise a person at all if the tranny might burn a bearing or something.
How many kms on the bike? Perhaps use that as a deciding factor as to whether or not you should order new bearings/seals and get busy with the whole thing. I might be crazy and sounding like i'm BSing, but i think i have some valid points.
Good luck, and no matter what, you're okay for the most part because you can still drive it; meaning the parts might be small, mostly intact, and easily replaced. Hopefully...