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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Coolant leak - near waterpump cover
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[QUOTE="chooch, post: 669804, member: 22152"] Not sure on a YZ, but on my cr250 that hole is there to indicate when a water seal and/or oil seal goes bad. If water is coming out, then the water seal behind the water impeller is leaking. You will need to replace both seals (its best to replace both even if only one is bad) and inspect the water impeller shaft for nicks or burrs that could eat into the new seals. Again, not sure on a YZ, but on a CR you have to take off the right side crank case cover to remove the impeller shaft and get to the seals. An easy job, but takes a couple of hours. And might need a bearing puller to get a bearing out to get to the oil seal. Someone please correct me if this isn't true on a YZ. Jon [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Coolant leak - near waterpump cover
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