Sorry to hijack the thread
I have the exact same issue on my bike with 150 000 miles on it. My question is what are you doing about it? Are you still just riding it or have you taken the head off to change the piston rings? I am thinking if its worth the effort or shall I just use it for as long as it goes.
I have a bike with low compression from worn rings/cylinders. The symptoms it's showing are it's hard to start when cold, it's down on power and top speed and it has a lot of blow-by into the crankcase. It's hard to start when cold however if you put a little oil in the cylinders it start instantly because the oil is sealing the cylinders and bringing the compression up. After it starts it runs well, it has no hesitation or spluttering anywhere. I think in your case it seems more likely that you had a spark issue after cleaning the engine, then later down the road you had a carb issue and you did some carb work and either it didn't fix the problem or it made the problem worse.
Just so we're all clear what exactly are your current symptoms?