Question about 2002 Yamaha YZ 426 F
Posted by Anonymous on
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Water pump leak 2001 YZ426F YZ 400 426 450
Coolant leaking from little hole in bottom of case YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3
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Posted on Aug 08, 2016
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Posted on Jan 02, 2017
SOURCE: water leak
That water leaking is due to a head gasket pressurizing the system. That's usually one of the first signs of trouble on the horizon. The seal is not the culprit. You can check the water pump seal by draining the oil. If you have any coolant in it then you may be lucky and just have a pump seal blown in which case it is a relatively easy fix. You will need to remove the side cover and the water pump impeller to get to the seal. You can use a seal puller to get the old one out and I would use a socket or something the same size as the OUTSIDE of the new seal. DO NOT let anything hit the inside of the seal or you will kill it.
I really hate to tell you this but most often it's a head gasket leaking that causes the water problem. Is it just a drop her and there or is it pretty obvious? That makes a huge difference. If the bike gets really hot you can over pressurize the system causing the seal to weep/leak, if it drips on a regular basis then the HG needs to be replaced.
Posted on Nov 30, 2008
The hole that your coolant is leaking from is a vent hole. Its purpose is mainly to give the airspace behind the water pump a place to expand into the atmosphere, and a place for the coolant to escape when the water pump seal goes bad. Every vehicle I can think of, if it has a water pump, its got a vent hole. So, what you are faced with is replacing the water pump with a new one (seals and individual parts are not available for the water pump on your Honda).
Posted on Dec 12, 2009
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You need a new water pump seal. It is fairly easy to fix and the parts are not expensive. Repair it before you cook your motor - that is an expensive, complicated repair.
Posted on Jun 27, 2011
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