[yorkie_chris]

Front HT lead issue will cause the running problems. Could also have damaged coil.
I remember hearing of a similar fitment that also makes a better seal with the cylinder head curing the wet issue, cant remember what fitting it is though.

Oil in airbox. Have you overfilled it? Oil can clog carb passageways up, it's too viscous to get sucked through some of the smaller ones. Clean the carbs in a load of petrol.