Ok thanks, just been for a 15 mile run. Mixture screws were about 2 turns out, certainly flat on the hills but seems to run ok otherwise. Didn't go above 40mph, no coughs or splutters this time, carbs seem to be clean now. New petrol tap leaking when opened fully, grrr, seems ok when only pulled out half way. Got back from run, not ticking over as well as when first starting from cold, had to keep hand on throttle. One question, is it better to tune when engine warmed up or doesn't it matter? The cam ring only moves about 1cm when lever operated. Thanks for replies PS. Eddie, removing the contacts(by the screw in centre of points)will this upset the timing?