Strange ignition problem

[GTRMikie]

When I start my Ducati Hailwood Replica, it only runs on the horizontal cylinder. The vertical cylinder will only chime into life if I pull the spark plug cap off, so there is a small gap between the contact in the cap and the spark plug terminal. If I push the plug cap fully back on, the bike reverts to a single cylinder. Any ideas anyone?

[paintman]

Does the problem move if you swap the plugs over?
Ditto if you swap the leads over (if possible to do so)

[GTRMikie]

Yes, I've swapped plugs, the next thing is to swap leads and coils and see if the problem moves!

[imagineifyeswill]

I would imagine its a coil problem, maybe a corroded connection giving low output, what you are doing is just amplifying the spark youve got,

[GTRMikie]

imagineifyeswill said:

I would imagine its a coil problem, maybe a corroded connection giving low output, what you are doing is just amplifying the spark youve got,

Thanks for that.