I rejetted the carbs and adjusted the air/fuel mix (it has v&h pipes + spike airfilter now). It runs well and there is no popping (was some before) BUT it won't settle on a steady idle speed, I've sync'd the carbs but the issue remains. It seems to vary between about 800 - 1100 RPM and actually stalled once at the lights. I've read it can be caused by the idle circuit being too rich or there is an air leak somewhere - any hints on what it may be? Edit: Forgot to mention that the needles were shimmed up as well. Thanks Darrin.