180C on both heads with t/couples under plugs, at 1/2 throttle measured at the twistgrip,, top gear, no wind, BTH at 34deg,set as per BTH instructions,no.4 slides, needles 1notch richer than central, ie raised from standard, 276 carbs, B7ES plugs, tailpipe has dark grey deposit. Plugs show a grey colour similar to cigarette ash colour on the insulators. Definitely not pure white,but not Tan or brown either! Is 180 too hot, and does grey mean weak mixture when using unleaded?