Just a thought, but how do the headstock bearings feel? this sounds a wee bit like the notchiness I've felt on some other bikes when races have worn. It's worse on taper rollers imho, but it's easy to fix.
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1979 LeMansII
1981 LeMansII
1981 Monza
1987 XT600 1VJ
1997 SZR660
1995 NTV650
"Why do it? Because we can, and we want to." Guiseppe Benelli
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