I sympathise mate, my bike is also my toy and my workhorse so understand, has anyone checked for vacuum leaks on the scotty?

are the battery terminals nice and tight? has anyone checked the CCA on the battery? do you know the bikes service history? i.e. valves, plugs etc.

if you've the time and tools it'd save you some time and money just running around checking your connector blocks.

I assume yours is a Z