MotoBuddha
Serious Thumper
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Let's roll!
Posts: 1416
Charlotte, NC
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If you want to, and if you can prop the bike more upright, it's a way to drain the oil filter.
Also, the oil passage that leads to the port on the lower front is connected to the one facing downward. If someone wanted to connect an oil cooler or remote filter, they could block the connecting passage. Then oil would flow out the forward facing port, through the cooler/filter, then back in the downward facing port, into the stock oil filter cavity.
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