Been having trouble with the mkii 850. Recently fitted un balanced headers and dual Amals (originals that came with bike last year). Right side has a chirp as seen and heard here: Have not been able to dial it out via air screw and slide stops. Also note bike has a misfire which is making riding it unpleasant. Seems to happen under most rpms and gets worse above 4k. Running a Wassell EI, similar to boyer. Connections seem good. Also getting oil leakage front fins of head. I tried sealant under the two front head nuts and torqued all fasteners. Leakage partially reduced but still there. Thoughts? Headgasket time?