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Hi, why did you change the sender in the first instance? If you mean the water is pushing past the radiator cap when the engine is hot, and suspect the head gasket is the cause of the water pressurising the system, run the bike with 1 plug removed if the cooling system is getting pressurised from a leaking gasket, then with the plug removed no pressure will be forced into the system from that cylinder and the water should not push past the radiator cap, try this on all cylinders one at a time to eliminate them, if the pressure does stop at any time then the head gasket COULD be at fault,you can buy a kit which measures water in th exhast system
there is really only two ways for oil to enter the oil (1) is the oil and water seals fitted on the water pump impellor or (2) the other is head gasket leak
the most common on MX bikes is the oil and water seal at the impellor (water pump)
if your not to mechanical minded then both of these issues you would be best to take to dealer to rectify as they bit tricky to do with out experience.
if you are mechanical minded then either problem is fairly cheap to fix about $25 for the oil water seals or about $70 for the head gasket
let me know if you want me to elaborate on either issue
good luck regards Jamie
Definitely the head gasket mate water cant really get above piston any other way - the piston would be sucking water into it on the down stroke then on the up stroke water would be passing pass the piston rings into sump oil
the only test you can do with out the bike started is a compressed air leak down test I happy to elaborate on this test if you need but if you do all your own rebuilds then I sure you know all about it..
when you take head off to replace gasket I would highly recommend you get the face of the head machined as pretty much any head that age in my experience at least would have some warpage to the face which will become harder and harder to get good head gasket seal even with new gaskets
also if budget allows this would be great time to consider new piston and rings kit even new cylinder as its all apart any how if you can afford it would be very worth while
when you get running again I would also change that oil completely and oil filter every ride for at least 2 or 3 times to make sure all that water is all gone - or it will bite you later with far worse problems than head gasket issues
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')