Question about 2002 Yamaha YZ 426 F

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I have a 2000 yz426f.Its leaking from the small hole on the bottom of the water pump do i need to replace the water pump? and can i do that myself ?

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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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

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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

  • 25 Answers

SOURCE: Yamaha WR250F Leaking coolant

yes thats the weep hole it leaks when your water pump iner seal starts going bad,

Posted on Nov 30, 2008

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SOURCE: 2001 Honda CR 125 motorcycle is leaking coolant

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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SOURCE: I have a slight water leak from the small bleed

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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YZ 426 F 2000 mi bike is leaking coolant from bottom through this little whole on the right side, I also checked the radiator inside and it's all frothed up. How to fix?

Hi, Jesse and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant and needs bleeding.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Having over heating problems with my 2000 taurus it does it most with def. or air cond. on full blast did find small leak at water pump where it bolts to block. replaced both cooling fansand,the thermostat...

No, the sending unit is working right.
Ideas? Yes, I think the problem is the water pump. Don't drive it overheated till you get a new water pump or have it inspected. You say it's a small leak where it bolts to block, but maybe it's the "weep hole" on bottom of pump leaking, meaning the internal seals on the pump have failed. If so, it won't be a small leak, it will leak all the time engine is running. A lot may be swept away by air, or by evaporating. Check it out. That's a likely cause of overheating.

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There is a small hole (called a weep hole) on the underside of the water pump. Coolant will leak out of this hole when the water pump goes bad. Verify the leak and replace the water pump

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Anti freeze is leaking after i shut the car off. my ratiator is new. its leaking under the belts

It sounds like the water pump . The pump has a small hole in the bottom of it thats there to let you know when the pump seal is leaking its to prevent the pump from failing in a major way at highway speeds where it would do a lot of damage . Most water pumps have this and its called a weep hole . If this is were its leaking you need to have the water pump replaced farly soon the bearing will be the next thing to go

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1 Answer

I have a yamaha yz426f that leaks water all the time from a small hole in the right hand side of the head whats the fix? it starts has awsome power but obviously needs looking at

I have a 2001 YZ426F and I had the same problem. The reason why is leaking because the water pump seals needs replacement and so the water pump shaft. You can still ride it, but you run the risk of overheating your bike. I recommend replacement of the water pump seals and shaft and you are good to go!

Dec 11, 2010 | 2001 Yamaha YZ 426 F

3 Answers

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Check your bottle cap, ensure that cap is tight. If it is, replace cap. Cap is not holding pressure.

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2 Answers

1997 Cevrolet Cavalier 2.4 liter engine leaks antifreeze

If it is the water pump it will have a rad hose attached to it. There is supposed to be a small hole in the bottom of the water pump. When it starts leaking, it's time to replace the pump. You can do it yourself. A few wrenches and a couple hours is all you need. If you are unsure pick up a Haynes manual for your car when you get the new pump.

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1 Answer

I have radiator fluid dripping from the bottom hose that looks like it leads to my engine

First check to make sure the hose clamp is tight. You need to check both clamps . One at each end. Also check to make sure the fluid is not leaking from the weep hole at the water pump shaft. If the fluid is coming out of the small weep hole you need to replace the water pump. Good luck. If you need more guidance feel free to come back to our site and ask more questions. We are glad to help in any way we can.

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2000 Jeep Grand Cherokee Limited

No, what you're seeing is the weep hole leaking on the water pump. This is the warning sign that the water pump is worn out. Don't use any stop leak or anything to attempt to stop it. You'll be waisting your time. You'll have to replace water pump at this point.

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