Okay.... I have not torn the bike down to figure this out (Yet...). SO- as descriptive as possible.. maybe?
If I let off the throttle abruptly, pull in the clutch fast, or go from 100% off-throttle to on (not 100% on.. we know how that'd go in 1st gear) I get a strange hesitation, then clunk/clank, and she goes normal. Does the same thing letting off slightly when clutch-less shifting but also using the clutch (rarely do this...). Easiest way I can think to "equate" the sensation is if you have something rolling around in your trunk/truck bed. So from off-throttle to on you have a moment of hesitation, then the "weight"/"load" hits the back with a clunk, then you accelerate fine/normal. Letting off gets a near-immediate thunk like you hit the brakes and your cargo hit the front of the bed. Make any sense for this analogy? Anyway. My initial assumption was to adjust my chain (as it feels almost like excessive.. severely excessive) chain slack being taken up.. but that doesn't even make sense coming off throttle.
2002 CBR 954, about 47,000miles.. original clutch =) SO thoughts? I was thinking maybe the clutch... but I really only use it to start moving from dead-stopped and don't feel any slipping under hard throttle. Ideas would be great! Also going to start tearing through the manual.
Edit: Might be worth mentioning... this problems seems less noticeable at higher rpms. The "smoother" the shift (usually at high-rpm) the less it does it... I'm still thinking clutch-related... but I'm no trans guy by any means.
Difficult to say from a distance, but could it be (?) a strange thump in torque common with those new fangled Fuel Injected bikes, made worse by a worn/failed component?
My XX is lovely when I am rolling off and rolling on the throttle - as in riding it on the road, smoothly and responsibly.
If, however, at lower rpm, I wack open the throttle, it feels like it has bogged down for a second and them gets going with a bit of a lurch.
On a dyno, it has very clearly lost AFR control. Do I need to say at this point that I have a full aftermarket exhaust.
So, is there any chance that it is an engine torque transient due to a failing electrickery component? ECM fault codes?
The solution is of course a Carburettor'd CBR-RR bike, that only has lashings of silky smooth torque.
[With the added benefit of regular Carb re-fresh work, which is a pleasure to do