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I have a mk1 b12 it has a rattle coming from behind the starter clutch cover when the engine is hot. Gets faster with revs and under load while accelerating. Is this normal for these engines?

My bandit 1200 had an issue of running on 3 cylinders which I have fixed but found I had a little fuel in my oil, could this just be due to un burned fuel in the cylinder getting past the piston rings? It hasn’t got any worse since fixing. Should I check anything else or just change the oil and filter and see what happens?

I’m about to do a full service on my mk1 1200 bandit. I know these engines are known for rattling a little but has anyone experienced a very quiet engine knock from the top left of the engine while sat at the lights?