When the jetting is off, let's say rich, and this can be at one particular throttle position, indeed you could be lean on pilot near closed, rich on needle near mid throttle and lean again on main. Just saying think about where.
Anyhoo, if you are rich, say just open as the needle is too thin there and you are getting wet drops of fuel, combustion will be incomplete and unburnt fuel will be expelled out the pipe. If you run oil in your fuel the residue will contain, wait for it. .,oil.
Running less oil seems like a good idea but will make the fuel to air mixture richer. Meaning bad combustion if it was already rich.
My bike seems to start running a bit burbly after a year or two and I remember that I should really change the plug. Never fouled one.
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'07 EC300 GG
'14 TXT250 GG
'? 496 CPI Cheetah RZ/RGV hybrid
'22 765 Street Triple RS
'21 XTrainer
'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
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