Looking for some advice please on refill quantity for Beta Evo 300 2012. Manual says 550ml but some folk have been advising me to go 75 - 100ml less than the guideline (not too sure I would want to do this) 

Half way up the sight glass

If you drain the transmission even if you leave it to drain overnight there will be a small residue left in there. Pouring in 550 ml will mean that you might be overfilling. If however the transmission has been apart ( cases etc slit and so on) then most if not all of the old oil will have been removed. So as capper suggests fill to half way up sight glass, ensure bike is at the correct position ie upright and not leaning over. Pour the oil in slowly and allow it to settle and any air trapped in the pouring process to clear. When you have got the level right turn the back wheel in gear to make gearbox internals move the oil around, stop and allow to settle, re check level and top up if needed. If you measured the oil being used you will probably find it hasn’t taken the full 550 ml.? obviously too much oil will be bad as there is a good chance when the bike is used that the transmission oil will overcome the oil seal and or the breather creating a leak.

Thanks guys let it drain from last night after warming it up. Followed your advice and it took 470 ml. Cheers