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Message: <blockquote data-quote="Dan Cooper" data-source="post: 1471911" data-attributes="member: 98210">The o-rings you have may or may not be the correct size.But the actual process of installing the waterpipe to the top of the head is sometimes problematic.Sometimes the o-ring will slip (or partially slip) over the bulge on the waterpipe as the waterpipe is installed and fail to seal properly.If you can dry out the wells where the waterpipe fits, it may be possible to examine down the wells with a light to see if any black from the o-ring is visible above the waterpipe bulge.In any case it means removing the water pipe and re-installing, probably new o-rings would be a good idea.I use o-rings from the plumbing section of my local big box store, #14 @ about 35 cents US each in a box of 10.It's even more difficult on the Gen 1 scooters while trying to get the thermostat housing onto the waterpipe at the same time.</blockquote>