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One of the mechanics did swap the carbs this changed the cylinder that was cutting out - rebuilt that carb and the problem seemed to go away - actually the distance before the problem increased the road test wasn;t long enough... Really appreciate everyone's help. it's going in to a really good mech...

It won't start without the choke - once again thank you for the help
Rod

I'm checking but I do believe when the carbs were swapped the system seemed to correct itself however the ignition was changed at the same time. The plug is I believe black and sooty not wet (but I need to check I am correct on this. I think it is a carb problem but they've been cleaned any worn par...

Hi I'll get the name of the system it's the one recommended by the guys who advertise in the magazine and yes leave it to cool down and everything seems fine....
Really appreciate the help

Hi Mike Thanks for the reply - I fitted a brand new digital system to cure the problem all it did was extend fault to occur from approx 1.5 to 15 miles running... Yes it is the same cylinder - the rear one. For the first 10+ miles it runs like a dream then the cylinder starts cutting in and out gett...

I have a 500 - I've changed to digital ignition, cleaned and balanced the carbs - but no matter what 2 highly respected mechanics do ,the bike rides perfectly for 15-20 miles then one cylinder starts to cut out then cut in - the plug on the cylinder that is the problem is black but when changed the ...