If you check the Online Parts Manual - MC18 section | E9 you will see the breather as part #3.

The tube runs under the carbs, and down the back of the motor, between the motor and swingarm, and then you will see a wire holder for it down below [and just in front of] one of the footrest brackets. I can't remember on the MC18 if it should exit on the left or right side though.
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Andy.
NSR-WORLD.COM

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