braap207 wrote:Common problem with 04's the impeller pump seals go out fast, no need to buy an 06 impeller, just drill a small hole in the impeller itself, I have pictures posted on this site somewhere, no time to look but its an easy fix. I went through 3 sets of seals in 05 on my 04. They are easy to change, no special tools required and the seals are cheap. You can ride short periods with it blown but unless your 450 is your primary means of transportation I would park it.
124 wrote:Braaap is stationed in Iraq right now. Not sure if he'll get back to ya right away. I'll jump in....
Drill the hole in the impeller here:
http://crfsonly.com/forum/album_pic.php?pic_id=1963
Replace #9, water seal. #8 is the oil seal and for an additional $2, I'd replace it anyway. Some cases have shown the shaft has grooved and needs replacing. Inspect very closely. Note: the pic above may differ from your bike slightly, but the parts are essentially the same.
logan6437 wrote:
Its been so long since i worked in a honda shop, so i know a bit, and kinda feel stupid for asking but all you have to do is take the water pump cover off to do the impeller but do you have to take the entire case cover off to do the rest correct?
and thanks for the illustrations
124 wrote:logan6437 wrote:
Its been so long since i worked in a honda shop, so i know a bit, and kinda feel stupid for asking but all you have to do is take the water pump cover off to do the impeller but do you have to take the entire case cover off to do the rest correct?
and thanks for the illustrations
There are no stupid questions, only stupid answers! Don't worry about it.
The impeller and water pump seal can be accessed through the water pump cover. You have to remove the right crankcase cover to access the bearing, oil seal, and shaft. It's easier to do the seals by removing the crankcase cover. The shaft should be CLOSELY inspected for wear. It's notorious for pesky leaks....
Nick Susco wrote:Lay the bike over on its side, so the water doesn't leak out when you remove the drain bolt, and check that washer. It should be a sealing copper washer. If not, get one on there and your leak may be fixed. You first stated it looked like that is where the leak was. That is for sure the cheapest, easiest solution. It is also pretty evident if the leak is coming out of the weep hole under the water pump. you can see that while the bike is on its side also.
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