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dtr 125 water splashing out

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lee125
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PostPosted: 20:18 - 27 May 2006    Post subject: dtr 125 water splashing out Reply with quote

the bike is 1994 yamaha dtr 125.ok about a week or so ago i skimmed the barrel and head and fitted a new head gasket since doing this i have been on the bike 2 times for about 4 -5 hours each time and now as soon as you hit powerband the coolent just splashes out of the back of the bike near the expansion tank or it is coming out of the expansion tank one of them anyway if you dont let the bike hit powerband it is fine and nothing comes out does anyone know what could cause this as it is really annoying me know cause while owning the bike the cooling system has never worked properly it has always done this or overheated any help will be much appreciated thanks
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years


Last edited by lee125 on 20:23 - 27 May 2006; edited 1 time in total
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shager
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Joined: 04 Jan 2006
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PostPosted: 20:21 - 27 May 2006    Post subject: Reply with quote

you ave got air in the water drain it and use coolent, or there is to much water in
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lee125
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PostPosted: 20:29 - 27 May 2006    Post subject: Reply with quote

also the power valve has been fully opened so your going along then it kicks in all of a sudden and then you are off.
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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lee125
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PostPosted: 21:44 - 27 May 2006    Post subject: Reply with quote

any ideas? please i really need to fix it Thumbs Up
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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Finglonga
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PostPosted: 22:51 - 27 May 2006    Post subject: Reply with quote

lee125 wrote:
also the power valve has been fully opened so your going along then it kicks in all of a sudden and then you are off.


Yep that would do it. Wink
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lee125
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PostPosted: 23:08 - 27 May 2006    Post subject: Reply with quote

i thought it might build up more pressure in the cooling system as it only does it when in powereband
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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sickpup
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PostPosted: 23:36 - 27 May 2006    Post subject: Reply with quote

Sorry mate but still sounds like the same problem. You did use new gaskets didn't you?
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lee125
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PostPosted: 23:57 - 27 May 2006    Post subject: Reply with quote

Quote:
Sorry mate but still sounds like the same problem. You did use new gaskets didn't you
yeah i used new gaskets it was fixed for a while then it started doing it again and i dont know what keeps causing the gasket to leak
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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Robby
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Joined: 16 May 2002
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PostPosted: 10:25 - 28 May 2006    Post subject: Reply with quote

Sounds like the head gasket has blown again.
Did you skim it yourself or get it done by a shop? If you did it yourself and it was your first attempt, you could have done a shit job of it.
You say you used a new gasket, so this should be ok.
Did you tighten the heads bolt down in the right pattern using a torque wrench?

Also is there anywhere else in the system that a DT125 can pressurise the cooling system?
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lee125
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PostPosted: 13:12 - 28 May 2006    Post subject: Reply with quote

Quote:
Did you skim it yourself or get it done by a shop? If you did it yourself and it was your first attempt, you could have done a shit job of it.

yeah i did it my self for the first time and did it the way everyone on here told me to do it when i put it together afterwards it ws fixed but it has gone again know.
Quote:
Did you tighten the heads bolt down in the right pattern using a torque wrench?
i tightened them down in the right pattern but i dont have a torque wrench
Quote:
Also is there anywhere else in the system that a DT125 can pressurise the cooling system?

im not sure but if there is that might be whats causing this? i dont know though really
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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lee125
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PostPosted: 13:13 - 28 May 2006    Post subject: Reply with quote

also i have taken the head of yesterday and the gasket doesnt have a hole or anything in it so it hasnt blown.
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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Robby
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PostPosted: 13:26 - 28 May 2006    Post subject: Reply with quote

It doesn't have to have a hole - but I would at least expect a scorch mark or some discolouring where the gases have leaked into the water jacket.

You shouldn't even consider do a job like this without a torque wrench. They aren't very expensive, you should get one.

Any other modifications to the bike like a big bore kit?

In your shoes I would be rebuilding the engine again, using new gaskets and being sure the head and barrell are perfectly flat. Then when you fill the cooling system make sure you fill it, let the bike warm up on tick over with the radiator cap off so that the thermostat opens, top up the rad as necessary, then switch off, let it cool down, check the level again, and put the rad cap on.

Also worth getting a new cap, just in case thats part of the problem.

If its still pressurising the cooling system after all that, I'm short on ideas. Maybe the barrel gone porous, but thats unlikely.
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lee125
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PostPosted: 13:33 - 28 May 2006    Post subject: Reply with quote

Quote:
but I would at least expect a scorch mark or some discolouring where the gases have leaked into the water jacket.
there was a scorch mark on part of the head and it hasnt had any mods apart from the powervalve has been fully opened
Quote:
warm up on tick over with the radiator cap off so that the thermostat opens
the bike doesnt have a thermostat in it has been removed as it wasnt working properlyi know it should have one but could this be part of the problem as water is constantly getting to the engine?
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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Robby
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PostPosted: 14:08 - 28 May 2006    Post subject: Reply with quote

Well the scorch on the head is probably where the gasket blew, so you need to do a decent job of skimming it this time and torque the head down probably.

The thermostat regulates the temp of the engine. No therostat will make it run cold. You should get one when you get a torque wrench.
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lee125
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PostPosted: 14:39 - 28 May 2006    Post subject: Reply with quote

ok will do thanks for the help Thumbs Up
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cbt passed Smile 01/07/2006 bike:92 dt 125 and 96 honda cr 250
theory:PASSED! A2 test:PASSED 08/11/2006 restricted to 33bhp for 2 years
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