Thud Coming Through Bars at Certain RPM / Speed
Not sure where to post this... but I have a thud-thud-thud rhythmic vibration feeling in my bars around 3000 RPM at 40-60 MPH in 6th gear. It also occurs in that speed range in 5th and 4th gear but less pronounced.
2003 GSXR 1000 with less than 8000 miles.
The thud-thud goes away between 70-130 (have not tried faster). It could be that it's still there, but the frequency is cancelling it out or something. The bike handles stops and goes just as you would expect. It might be in my head, but it feels like the thud in the bars feels more intense as the bike has come to full operating temperature. When I pull in the clutch at that speed it FEELS like it goes away or is dramatically reduced. When I rev to 3000 in neutral and hold it there, there is no vibration. Only when moving. When I feel on either side of the crank - stator or clutch, I don't feel any vibration or thud (when driving at that speed, reaching down to feel the cover to see if I felt it there...) I thought maybe the stator is binding on something... but I was super careful. I don't think it's that and I also feel like I would feel that through the stator cover. Before the "incident" described below, I don't recall ever feeling this same thud-thudd in the bars.
Background: I put her down on the lowside on the track. Busted the stator cover. No other damage apparent. There was some amount of dirt ingested near that stator area. I wiped it out and then rinsed it all down several times with diesel in a sprayer. Then I pulled the oil pan and cleaned it. The bottom end looked very clean from underneath. I installed everything back and it fired right up. I ran it for an hour and then put another batch of fresh oil and new filter on. I've now driven it about 1000 miles. It runs great.
Some of my wheel weights did fall off in that scuffle with the ground. I pulled both wheels and balanced both of them again, and taped the weights this time. Both wheels are balanced. It's not that...
It has pretty new tires. There are no flat spots or anything like that.
I have cleaned and lubed the chain I don't feel or see anything weird in that area.
If it was engine damage I would think it would manifest at all RPM range...
I'll check the front bearings by pulling back and forth on the wheel to see for play but when the wheel was on my balancing stand it spun very freely. I see no damage to the rotors or pads, and it has new pads from my last track day.
No idea what could be causing this. Any ideas where to start (other than checking front wheel bearing which again I would think would manifest at all speeds/RPM range.