Question about 2006 Yamaha DT 125 X

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Presure in raidiator

Hi just bought yam dt 125 1989, done the head gasket and water pump,flushed system out already had bottom end rebuild. but its still got presure in raidiator and its chucking the water out of the expansion tank? will run for an hour the over heats. [doing my head in]any ideas thanks

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  • hondan64 Feb 21, 2009

    hey i have a yam 1990 DTR and have the exact same problem there is pressure in the radiator and my antifreeze/water is spurting out the overflow bottle so much that it blew the cap off, got the head skimmed and renewed the gaskets but still the same problem also checked the thermostat found out it was bent/broken took it out but still no luck just blew cap off again, oil level in the gear box was really low and that supposedly lead to overheating (so it said in manual) topped it up still no luck. Dont know what to do REALLY p**sing me off.


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I know you said you did the head gasket, but it really sounds like a head gasket issue and pressure getting from the cylinder into the colling system. If you've had recurring overheating that necessitated another gasket replacement you'll likely have a warped head, which could explain the recurring t symptoms despite changing the gasket.

I'd do a compression test with the radiator cap off and see if you're losing compression. You'll likely need to have the head machined to remove the warping. Once machined and replaced with a good Yamaha brand gasket and a high temp sealant to help it, you should be okay. Be sure to torque the head bolts exactly in the order required and to the exact level required by the factory.

Hope this helps.

Posted on Dec 29, 2008

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if the water pump bearing or seal or bearing has colapsed it is posible for water to find its way into the crankcase. however I must ask did you completely flush the cooling system & change the oil when you changed the head gasket if not the sludge that was left behind would continue to mix with any fresh oil or coolant you may have put in if in fact your problem was a blown head gasket in wich case you need to investigate the cause of the blown gasket have you recently topped up the coolant whilst the motor was hot or worse over heated doing so will definately cause a head gasket to blow was there obvious evidence of the gasket being blown ie blow by marks on the gasket or the head & barrel surfaces if not you will need to further investigate the reason for water finding its way into the oil.Let me know how you get on.Regards Geoff

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