That's right it was an inline arrangement, it's been a while. We have gas without ethanol available.
If the jetting is close most of the fuel mixture will be burnt. If it is rich combustion won't be complete, extra mixture will be expelled. That mixture contains fuel and oil.
Additionally trials bikes spend a lot of time, I'm going to use the term slightly erroneously 'Off-pipe', so more mixture is wasted than an engine run at speeds closer to optimum, and thus more being short circuited out without being burnt.
Don't lose sleep over it, people get worked up over oil discussions.
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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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