Question about 2005 Yamaha WR 250 F

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Yamaha WR250F Leaking coolant

There is a small hole (which is obviously meant to be there) in the bottom of the righthand crankcase cover just under the water pump that leaks coolant when the engine warms up. Could it be possible that the water pump seal as failed? There does not appear to be any water in the oil.

regards, Nick

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

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What does the inner water pump seal on an wr250f look like?

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You're not giving enough info to pinpoint your problem area however I have seen coolant leaks on this model from the o ring that seals a cover bolted to the top of the crankcase. It is between the cylinders, under the carb assembly. Look for white dried coolant residue in this area. It is a tedious job but can be performed with the right tools without a lot of major dissassembly. Good luck.

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Coolant is slowly leaking out of the small hole on the bottom of my water pump casing. What do I need to do to fix this?

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Oil & coolant change, 1998 yamaha 1300 royal star

Before doing either of these jobs, you'll have to run the engine for 8 to 10 minutes to warm up the engine, oil and water.

To change the oil - prop the motorcycle so that it's as close to level as possible, but will not tip over in either direction. Remove the oil fill cover on the back crankcase cover on the right (brake pedal) side. Look directly beneath the cylinders, you'll see a large hex-head bolt (drain plug) in the center of the crankcase. Make sure that you have a container with a capacity of in excess of one gallon under the bolt. Loosen and remove the drain plug (very quickly, the temperature of the oil will be sufficient to cause blisters if permitted to remain on the skin), but do not, if possible, allow it to fall into the pan. Permit the oil to drain fully; while it's draining, clean the plug carefully - you'll find a magnet protruding from the center of the plug, with metal filings collected on the surface - remove as many as possible before reinstalling.

Turn the plug back into the crankcase until oil ceases dripping, move the pan to the front of the engine. Behind the radiator, low on the front of the crankcase, you'll find the filter - it looks very much like the filters you're used to seeing in your car. If you're at the front of the bike, turn the filter counterclockwise to loosen and remove; remember that the filter holds about a half-pint of oil as hot as that you drained out of the crankcase, so keep your hands out of the way as much as possible. When the oil stops dripping, and the filter has been removed and disposed of, put a thin film of oil on the rubber ring on the bottom of the new filter, turn it clockwise to mount it on the crankcase, and tighten as firmly as you can with your hands.

Go back to the drain plug, remove and let whatever oil has collected drain out, then reinstall, tightening to 32 ft.-lbs (43nm).

Pour about 3 1/2 quarts of oil into the crankcase, replace the oil fill cover, start the engine and check for leaks at both the drain plug and the filter, tighten as necessary. To check the oil level, look for a glass window on the right side of the crankcase marked for high (max) and low (min) levels. Get on hands and knees and look under the front crankcase cover directly beside the right operator's footrest; you'll probably need a flashlight to read it. Once the oil level is between the minimum and maximum markings, tighten the oil fill cover, and return the bike to its' normal parking position on the kickstand.

To change the coolant - remove the driver's seat, fuel tank, all four cylinder side covers, and the right side cover (color-matched cover under driver's seat). Prop the motorcycle so that it's as close to level as possible, but will not tip over in either direction. Place a 24"-30" drain pan slightly forward of the center of the engine - if you do not have a large drain pan, a small one placed under the drains individually, IN THE ORDER LISTED, will work. Siphon all coolant from overflow reservoir under the side cover OR remove the center cover, remove bolts holding the reservoir to frame, invert the reservoir to empty, and reattach the reservoir to the frame.

Now, remove the radiator cap and the drain plug at the bottom of the radiator, allow the radiator to empty. Remove the plugs at the lower portion of each cylinder in no particular order, drain fully, then remove the drain plug from the bottom of the water pump (the large protrusion beside the front right driver's footrest). Once all drains have ceased dripping, reinstall the radiator plug (torque to 18 ft.-lb., 25nm), all four cylinder plugs (seat firmly in the drain holes), and the water pump plug (torque to 32 ft.-lb., 43nm). Fill the reservoir in the rear, then fill the radiator as much as possible, cap, and run the engine for 3-5 minutes to warm. Remove the radiator cap, check the radiator and refill, repeating until there is no air beneath the radiator cap when it is removed.

Reinstall the body panels, tank and seat, and return the bike to its' normal parking position on the kickstand. If additional coolant is needed it will be added to the reservoir - check frequently for about the next 100-150 miles.

Note on oil - I've always warned people away from oils that were labeled "energy conserving", but lately I've noticed that those same oils no longer carry that label. I've been seeing a new seal on them; on the outside of the seal are the words "American Petroleum Institute" on the top, "Certified" on the bottom, and in the center of the seal are the words "For Gasoline Engines", and - surprise, surprise! - they ALL contain molybdenum disulfide, the stuff that makes clutches slip. Check the bottles of the oil that you're considering for use in your motorcycle. If you see the API seal, keep going. Unfortunately, a member named "rasolheim" is learning the hard way how expensive an error like that can be; I hope that I can warn others before they make the same mistake.

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