At what RPMs are you hearing it?
You know the SV650 doesn't like too much throttle under 3500-4000 rpm. It protests by knocking/bucking.
OOPS!! Didn't notice I was in the Gladius forum.... Sorry!
SFV650 looks a lot like SV650 if I'm not paying attention....
I have been reading the Gladius threads, I like the bike. If I ever got one I'd like the black one, paint the frame & wheels silver, remove plastic frame covers & radiator shrouds, & powder coat or paint the rearsets satin black.
Newest CYCLE WORLD has a test. Says weight increase is 14 lbs, torque up by 6 ft/lbs, seat height 1.7" lower, 11.99 sec 1/4 mi. - quicker than all but one of the SV650's they ever tested. They like it. I do to.
Enjoying keeping up with all your mods.
Terry