Yz 125 water pump seal

A leak on the O-ring seals on or sealing the spinning shaft. It is a known issue because a Water Pump Service Kit is readily available.

Motorcycle Water Pumps for Yamaha YZ250 for sale ' eBay

https://www.ebay.ca > ... > Motorcycle Water Pumps
In addition to the parts mentioned in the Yamaha water pump rebuild kit, the Yamaha water pump itself consists of a cover, an impeller, and an impeller shaft.

2001 Yamaha YZ250 (YZ250N1) Water Pump

https://www.yamahapartshouse.com > oemparts > yam
Shop online for OEM Water Pump parts that fit your 2001 Yamaha YZ250 (YZ250N1), search all our OEM Parts or call at (231)737-4542.

Water Pump Rebuild Kit Fits 2001 Yamaha YZ250 ...

https://www.amazon.com > Water-Pump-Rebuild-Yama...
Water Pump Rebuild Kit For 2001 Yamaha YZ250 Offroad Motorcycle Kit includes water pump cover gasket or o-ring, water pump shaft bearing(s) and seal(s) to ...
Special Features: ‎RAD Powersports Supplies ...
Item Weight: ‎2.4 ounces
Brand: ‎RAD Powersports
Product Dimensions: ‎5 x 5 x 1 inches

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  Water Pump Kit For Yamaha YZ250 2001 - Amazon.com

  https://www.amazon.com > Water-Pump-Yamaha-YZ2...
  Water Pump Rebuild Kit; Compatible With Yamaha YZ250 2001; Pump Gasket, Clutch Cover Gasket, Water Pump Shaft Oil Seals; Kit contents will vary slightly ...
  

Yamaha YZ250 Water Pumps & Components

https://www.motorcycleid.com > ... > Yamaha
Results 1 - 12 of 12 - Our Yamaha YZ250 Water Pumps & Components lineup includes premium Motocross/Dirt Bike ... Outlaw Racing® - Water Pump Repair Kit.

WINDEROSA Yamaha YZ250 2001 Off-Road Water Pump ...

https://www.peakmoto.com > products > winderosa-ya...
Fits the following model/s:Yamaha YZ250 2001 Includes all the gaskets and/or o-rings, oil seals to repair the water pump. Kits does not include water pump ...

Hi mate this will be the oil & water seals the leak from weep hole is basically a warning light to tell you it needs replacing asap, you need to remove impellor, carefull not to lose the spacer washer behind it...then remove the water seal clean the surface it came from and replace with new seal. Now to do this 100% I would always replace the impeller shaft as the shaft wearing is usually what caused the seal to fail and I would also replace the oil seal which is the other side of case that you just changed the water seal (oil seal sits behind the small bearing) I would also consider replacing this bearing but maybe not critical? all up the impellor shaft the 2 seals and bearing last time I bought cost about $160... no special tools required just quite a bit of time required as you should really remove the outer engine case to access the impellor to undo it and to get to the oil seal and bearing, how ever I know guys do just open the water pump cover then rattle gun off the impellor only replace the water seal then install the impellor and cover back on then ride away! this will work and will fix the leak but is definitely the incorrect way to repair this and will be temporary fix but thought you may like to know this alternative as is very handy way to do it if your on a race meeting and just need to get through the last race or two.

hope this help cheers... Moto X Parts online.com

u need special tools and technique for bottom end work--get a clymer repair manual soon or go to library sec629---------see u on the track

remove clutch cover,hold water pump shaft on flats on shaft and undo impellor by nut cast on impellor. remove old bearings and seals.check shaft for grooving where seal runs and replace if any.assemble in reverse order with new seals and bearings etc

will need a seal, and sometimes a new impellor shaft. dont ignore it and let the bike overheat

If we are to assume it's coolant and not water being introduced through the crankcase vent hose, there are only two possible places for this transfer to occur - the water pump seals or the clutch case cover gasket. Those are the only two direct interfaces between the coolant and the transmission fluid that exist on that bike.

You replaced the seals - did you replace the bearing too?

It has seals there for the water pump. They need to be replaced.

Hi,

This is a mechanical oil seal. In order to replace it, you will have to remove the right hand side engine cover. The seal is located in this cover.

If you are not an experienced mechanic then you should take your bike to a dealer.
NB use the genuine part for this bike.

Good luck

Jon

Yes, the water seal is leaking. This is the indicator hole for the water and oil seal.
Enjoy the ride !

Jon