should be getting between 60 to 110km on a tank depending on the riding.
very common problem is the float not being set correctly or not closing and you are loosing fuel through the overflow. a quick test is to tape a small container to the fuel overflow and see if it fills over a small bumpy ride.
40km of super rich jetting i suspect would be noticeable because it would have been split with plug changes lol
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2003 txt250 Pro
2013 Ossa 280i
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