Running On Two

Out on the bike toady for a ride all went well had to go to reserve then filled up, no probs stopped for tea then set off back been running for 20miles or so when backfire from one side and bikes running on two cyls and cutting in and out of three, first thought bit of muck in fuel but then wondered about coils, still on old ones, what would be the symptoms of a coil breaking down?

 

How do i get hold of Paul Messenger to order a set of stick coils ?

 

Further to my saga "running on Two" I have now replaced the coils and spark plugs, drained the tank and cleaned it out, had the carbs off and given them a clean up made sure all the connections are sound so time for a ride out!!
First 10/15 miles all sweetness and light then the occasional miss mainly when accelerating, not as bad as it was , when cruising the bike seems ok but throttle back for a roundabout and start to accelerate it goes down onto two and coughs and splutters before picking up. im loath to take it to a garage as its going to cost a fortune for them to even find the cause.
Any suggestion as to what to try next invited