Hi all,today me and my son went on the local charity run,beautiful sunny day 1300 bikes,good company and my trusty old donkey

She didn't miss a beat for the first 100 miles then pulling up a hill at about 70mph she went on to 1 cylinder

I haven't had much time to investigate but its sparking at both plugs and the none firing side the plug is wet,i have also stuck my thumb down the plug hole and there is compression.Any suggestions where to look next are very welcome.Sean.
