Hi,Sorted the problem,removed the carbs once more just to see if something obvious was staring me in the face,and on close examination with my best reading glasses on the left handcarbs main jet although it was not blocked it had furred up to a much smaller hole than in the right hand side,replaced the jet with a new one and hey presto its as sweet as,It just proved that just because i could see daylight through it i thought is was OK, and unclearly it was not,thankyou for your replies,jonmac
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John