loosing coolant

[bigc]

I replaced the water pump on my yz250.I start it up and i get coolant coming out the radiator over flow,quite a bit maybe half a quart over ten minutes.I tried a new radiator cap any ideas?Head gasket maybe?

 

[Peachy]

I'm in the same boat with my KX250. I've been told that it might be the head gasket or the cap like you said. I tried a KDX cap (which is identicle to the KX's) on the weekend and still have the same problem.
It must be the head gasket then....

Good luck!

 

[RM_guy]

Yep. Sounds like a leaky head gasket

 

[Mainjet]

Since you said you replaced the water pump, I would go back and check that I didn't do something wrong........

 

[okieguy]

If you have a leaking head gasket it can presure up the radiator. Chances are if the water pump went out and the engine got hot, you warped the head a little causing the leak.

Take the head off and get 320 wet & dry sandpaper and a flat service such as a piece of glass, make figure 8's until you see all fresh metal.

If you continue to run the the engine with a leaking head gasket and it is sucking water into the head it will wash down the oil causing lots of damage after a while. I learned this the hard way when the main bearings went out.

Guy

 

[okieguy]

Oops, I should check my spelling closer before posting. Sorry guys.

 

[rickyd]

If water was getting into the cyl, would there be a loss of power?? Did you recently have the head or cylinder off?? Maybe a gasket got installed wrong if so..
Rick

 

[prvt.pyle]

had the same problem with my yz 250 replaced the head o-rings and problem resolved.

 

[bigc]

fixed inner head gasket(o-ring).