Since there is a lot of discussion of the mysterious front cylinder dying lately on the mc16 can anyone give me a clue as to why my bike fires up okay on both cylinders but no sooner as it gets warm then it will only fire on the rear cylinder.

Plug good
Coil swapped and worked but by this time the engine had cooled again.
Carb not touched since bought of ebay 3 months ago but fuel is getting through as the plug was wet when I was inspecting it.

i thought of fitting a bentley radiator to keep the bike cool?

Any advice would be appreciated