K100RS pressure in expansion tank....

[ileumi]

Moro taas!

New problems, old bike....

I repair water/oil pump in winter and make system filling just as Clymer says. Take bike hot and went that bubles are gone. Fill radiotar neck on top and expansion tank half.

In stand, when bike is idle/rpm everything is fine. BUT..... When I go to drive, expansion cap blows water out. When I try accelerate, tank cap jump away.... In home check... One liter coolant water is away...

Whats going on now....

Bike 1991 RS.

Hyvää kesää!

-Ike-

[ileumi]

And....

Seems no oil in water. No Water in oil. Spark plugs fine.

[Laitch]

Try replacing the radiator cap gaskets or the radiator cap altogether. I think you've lost pressure there.

How is the rest of the system? Does your bike's fan operate correctly? Does the overheat warning light turn on when the geyser is happening? Have you tested the thermostat? You seem to understand the coolant replacement procedure.

[Martin]

+1 on Laitches answer. Sometimes the cap can build up deposits from running non distilled water or non compatible coolant mixes. You might want to soak your cap over night in white vinegar, this should remove any crud that has been built up. Always use distilled water with a suitable coolant. If there is scum in the top neck of the radiator or in the overflow bottle you might want to flush the radiator with a suitable radiator flush.
Bricks are sensitive to internal and external radiator core blockages, check inner and outer for restrictions. Never ever clean the outside of your radiator with high pressure water or air as core damage could be the end result..
Regards Martin.

[ileumi]

Propably yes....

I fill up radiator again (I use only water becouse glygol-geysir is very dirty) and fit gasket so good as possible. Also, when I test radiator cap... Suck cap and hear "plop" and air will blow in.

Radiators cap rubber-seal is not good shape and sometimes dropped away. But.... At first test drive radiator and tank works fine!

Then I make some tune-up and engine cool down. Then few kilometer test drive and geysir will be back.

Now cap is in winegard. In finland we call "etikka"

[Laitch]

Now cap is in winegard. In finland we call "etikka"

In Vermont we call it vinegar. What I want to know is, have you tried soaking old tires or inner tubes in tubs of vinegar to restore them? :giggles

[bizzaro]

I am not a mechanic, and I don 't play one on T V.  How much fluid is your cooling system taking? Drain it and see if your system is using the correct amount to fill up.  I think your radiator is fucked and you are not getting circulation through the radiator, causing the coolant to overheat and piss out?  I am probably wrong, but there ya go.

[Martin]

If the glygol gysir is very dirty you need to clean and flush the radiator and engine block with a aluminium compatible cleaner. If it is really bad you may have to do it a couple of times. When you have clean water flowing through the radiator and engine then flush with distilled water and refill with aluminium compatible inhibitor coolant and distilled water. While running tap water is economical in the short term it will get expensive in the long term. It will cause corrosion in the cooling system and engine. It will also cause corrosion in the water pump and core plugs leading to blockages and overheating possibly destroying the engine. 
Regards Martin.