What`s the ring gap???????
I`ve never seen this on the XR650L..i`ve used quite a few in rebuilds i`ve done....
And did you bore the cylinder....sounds like an out of round cylinder to me...i`d have a proffesional measure it in 3 spots and at 3 different areas down the bore....
01 XR650L,102mm JE 11.25:1
..NX650 second gear,FMX650 fifth gear,ported CW head,KW valve train,MegaCycle 173X25.FCR MX pumper.42/158 NVCT needle.Cycra probend CRM,Scott`s sharkfin,Xr`s Only casesaver.FMF "Q2",Sutton Oil Cooler,Clarke 4.0,Red XR`s Only skidplate,Doubletake mirrors,Manracks Rotopax rack..one Minature Schnauzer