by JimDirt » Fri Jun 07, 2019 7:54 pm
If you are talking about the large round plug on the clutch side , it is just about at the same height as the fill level plug , so trace amounts of oil can come out , but unless you are running a full quart , it won't be much if you used the specified amount , and at most it will be under 1cc if that , as once the oil gets to the level of the bottom of the opening , it will stop ....... If you are just looking for a quick reference , then put the bike on the kickstand instead of on a stand , so it is tilted to the left , then check your mark , then reinstall the plug once the mark is aligned
But , No , a valve check/timing mark inspection does not require oil to be drained ....
2020 CRF450R
2006 CRF450X

Weiser , Idaho