Oil seal, mechanical seal and weep hole infopic
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Here's a little infopic showing the relationship between the mechanical seal, oil seal and weep hole at the back of the motor. If your bike is leaking coolant out of the weep hole don't seal it up, investigate it - else if the mechanical seal fails in a big way you'll end up with coolant being forced past the oil seal into your motor rather than out the weep hole, as Honda designed.
Here's the current infopic for these parts:
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