I think water go in to the engine oil of my bike, what can cause that? crf450, 2004

There is water mixing with the oil causing the milky color. Running the engine can severely damage it which will result in very high repair cost or event scrapping the engine. It is most likely the top gasket that has blown and replacement thereof is not very difficult and also reasonable in price. Get it done asap.

It will work but you will eventually seriously damage the engine. Water in the oil will cause it to emulsify preventing it working properly as a lubricant. The water turned to steam will damage steel by causing rust (Oxidisation).

If you have a water cooled motorcycle and you have water in the oil is it an indication of a serious problem.

For instance, if the cylinder head is leaking water into the cylinder because of a faulty head gasket or warped head. The cylinder will fill with water. As water is non compressible it will cause the piston to bend or break the con rod causing significant engine damage.

If it fails at high speed on a bike it could be fatal to have the engine seize.

Are you sure you're checking the engine oil. On your RK, the oil dipstick is a large knob about two inches in diameter located on the corner of the transmission. Now, the transmission dipstick is a small dipstick on a plug that you take out with a hex key or Allen wrench. I cannot understand how your engine oil could possibly turn that color in a short ten mile ride. I've seen this on transmissions that have not been serviced regularily. Moisture from condensation gets into the transmission and mixes with the oil. When the bike sits, the oil and water seperate and the water will cause rust to form on metal parts. When the bike is run again, the rusty water again mixes with the transmisson oil and makes it look like "choclate milk". I have never seen engine oil do this even though I've seen engines that have been overheated to the point of destruction. It sounds like water in the oil. If it is water, I have no idea how it's getting into the engine unless someone is putting it in there intentionally. I had one guy that kept getting water in his fuel tank. He blamed the gas station where he bought his fuel. Turned out it was his 5 year old son filling Daddy's gas tank up with the water hose. Check that oil again. Ask some of the parts houses around the area if they know someplace that will analyze the oil and tell you what the contaminate is. This is a new one on me. Let me know what you find at [email protected] , please.

Good Luck
Steve

This is what we call "oil sumping" around here. On the soft tail line or any other line of Harley where the oil tank is higher than the oil pump, the oil will seep past the check ball in the oil pump and leak into the crankcase of the engine. When the engine is started up, it will "puke" the oil out. Now, up until the introduction of the Evo engine, the engine would puke on the ground under the bike out the breather tube. Now with the Evo engine and the EPA's regulation that crankcase ventilation fumes have to be fed back through the intake, it pukes into the breather. An even bigger mess. So, what we do whenever we think we've got this situation is put a pan under the shovelhead and panhead bikes, On the Evos and Twin Cams, we take the air breater cover and the air filter out before the fire the engine. It's a mess either way you look at it. I don't think the Twin Cams are as bad as the Evo engines due to the different type of oil pump.

Hi, if you are sure there is no leaks, then the water, causing your oil to turn milky grey, comes from condensation forming on the inside of your gearbox.
Now , the cause of this, is usually due to short rides, especially in the cold weather. The engine needs to get to full operating temp.
While the milky oil is not really a great problem, my solution to you would be more frequent oil changes. If you store your bike over winter, make sure you drain your oil first, then you can refill with fresh oil when you bring it out of storage.
So the answer to your question why does it happen, cause your engine is not getting hot enough, for long enough.

The water pump oil seals, yes. The seals keep the gearbox oil separated from the water. The only other way water can normally get into the gearbox is if you have a cracked center casing, a loose oil filler plug, bad head gasket, bad cylinder gasket, and condensation. The normal culprit is the water pump seals.

If the 'white liquid' is like a froth then it is probably water & oil mixed. This happens when there is water in the oil or oil in the water. The usual cause is either the mechanical oil seal behind the water pump leaking or the head gasket leaking. As the right cylinder is covered in this, it is most likely to be the head gasket.
Otherwise it could be that the 'white liquid' is coming from a leaking radiator. If the cooling system is filled with this froth then it wont cool the engine properly.

Hope this helps. If it does then please mark this as 'useful')
Ride Safe
Bike-Doc

I would recommend a leak down test to distinguish if the low compression was due to ring wear or an issue with the valves/seats...cylinders bores dont just wear out from sitting.
It's very possible that the valve seals were worn allowing crankcase oil to seep into the combustion chambers, thus causeing it to smoke. Being a 3 cylinder water cooled engine it should not have an overheating issue to cause the rings to stick...unless it was neglected, and not regularly serviced, debris in the oil filter, low oil pressure.. sludge from worn out oil. A good clean air cleaner is important...bad filtration will cause premature engine wear. Install a K & N high flow filter... and your good for the life of the bike.
Hope this answers your question...good luck with your bike.

Yes this is evident in replacing engine oil to motorcycle engine.

Engine oil designed for automobiles isnt good for motorbikes as they offer additives for added "slipping". THis will cause your clutch to slip. Automobile Engine's oil system is separate from the clutch while motorcycle's clutch and engine fall under one oil system.

Use engine oil designed for motorcycles.
Solution: Buy and Engine flush, pour it to your crankshaft, run the engine for 5 minutes (idle) then drain. Replace with new motorcycle oil.
-levibit-

try tightening up you head bolts to and check the head gasket if you ripped it a little bit then it will let water pass through too..