[simonjrwinter]

Thanks guys,

MSD coil and ign, yes

Had the covers off (this started when a roller rocker came loose and the engine started "coughing" back through the carb) but all the valvetrain's been adjusted and seems nice and quiet
took off the rockers for no5 cyl and removed the plug to see If I could isolate the noise, but the noise of the air coming out through the plug hole drowned out everything else, guess I('ll have to take off the inlet and have a look see.

Simon