The drain towards the front of the diff will drain both sides of the diff. There are times that you won't have to change out all the oil so that is what the one nearest to the rear is for. If you ask me it is a dumb design for what little bit more oil you have to use but some engineer bean counter probably figured that Yamaha could save a few cents and charge you the same. Who knows for sure.
2016 Kodiak 700 base model with a few SE parts CV boot guards, receiver hitch, Grizzly bars. Trail Tech Striker speedometer/voltmeter. 501 Parts Electric Grabber locking diff
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