I follow lots of garages on YT and I think you could be as good as any of them. If you build it they will come!!! I would suggest holding off on 'oops I'm waffling' type comments - someone will learn something the more you're willing to share and if they think you're too long winded they'll skip ahead. It just makes it more watchable and professional if you complete your thoughts with confidence. Looking forward to the next one...
I put £7 of diesel in my cbf1000 last year, slip road onto A19 from forecourt and my mate on his GS disappeared in the smoke, initially I thought I had dropped a valve, it was running really badly and my mate suggested I had put diesel in, we sniffed the tank and there was no smell of diesel at all, I ran the bike to the next services where it was decided that the LEJOG Charity run was over for me. I was quite close to Thirsk so I called into Teesdale motorcycles and he immediately diagnosed diesel, I argued the point and he asked if I had my receipt... Felt a right tit but he drained the tank put some injector cleaner in, pushed the bike to the local petrol station and sent me on my way all for Gratis... I subsequently achieved my best ever MPG figures which was surprising because I was thrashing to meet up with my friends again. It was Shell diesel so I don't know if they use some sort of deodorant to mask the usual smell.
I guess the owner thought it was a limited edition diesel after all! But If it's not actually diesel in the fuel, you know you mentioned the owner thought that the bike was using oil and that the oil level was low... do you reckon they might have been checking the level on the side-stand, obviously reading low, adding excess oil, and the oil's been blowing through the PCV and into the intake? That said, I suppose when taking it apart you would have noticed if the airbox had become an auxiliary oil reservoir ;) Nice easy fix either way - better than taking the head off!
I think he fill up a litlle of diesel fuel into a tank , engine start and works , but smoke. Ride it about 30min and there will be no smoke in sillencer, This engines are bulletproof and is hard to kill it easlly.