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The oil filter is located at the front of the engine, between the frame downtube and front cylinder.
Move the oil pan to the front of the bike, directly underneath the oil filter.
Remove the oil filter. This may require an oil filter wrench.
If you don't have an oil-catcher, the oil will run down the frame, and get on some parts of the bike. There is no easy way to prevent this, so just wipe it down when it's done dripping.
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