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DT125R Forum -> Tuning -> Thermostat problem maybe???? Turns out to be head gasket again
Post Info TOPIC: Thermostat problem maybe???? Turns out to be head gasket again
craigbulmer


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RE: Thermostat problem maybe???? Turns out to be head gasket again
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mine was to, a tiny bit
mine wasnt overheating.. was just SLOWWWWW

but i only head skimmed incase, it was the piston that went wrong..

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satelliteone


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yup been down the head warp route!,, head gaskets, got a pile of the aftermarket ones.

Robin, whats that copper silicon stuff?

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Dickhead


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fray wrote:

Cheerz for the reply malc. The waterpump is working fine, also thermostat is all good have tested in a kettle.

The rad cap is pressurising aswell as when i take the cap off it releases pressure so it must be holding pressure in.





when cold ther should be no pressure unless yor gasket is leaking and presureriseing your colant

 



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http://images.google.co.uk/imgres?imgurl=http://washford.scene7.com/is/image/Washford/599712%3F%24prod%24&imgrefurl=http://www.halfords.ie/webapp/wcs/stores/servlet/product_storeId_11101_catalogId_15551_productId_173139_langId_-1_categoryId_212519&usg=__sR3Szr_dIVi4WrEW3O2NhV5Zt60=&h=200&w=200&sz=7&hl=en&start=11&um=1&itbs=1&tbnid=b0ERbG00He8P9M:&tbnh=104&tbnw=104&prev=/images%3Fq%3Dloctite%2Bcopper%2Bsilicone%26um%3D1%26hl%3Den%26sa%3DX%26rlz%3D1T4SUNC_enGB362GB362%26tbs%3Disch:1


i have stoped useing head gaskets on all my dts now i just lap the head and barrel with a sheet of wet and dry on a a thick glass, then asemble with copper silicone i also think the higher compression inproves low end power

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fray


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robin wrote:

 

fray wrote:

Cheerz for the reply malc. The waterpump is working fine, also thermostat is all good have tested in a kettle.

The rad cap is pressurising aswell as when i take the cap off it releases pressure so it must be holding pressure in.





when cold ther should be no pressure unless yor gasket is leaking and presureriseing your colant

 

 



Yeh i no mate thats how i knew it was defo the head gasket at fault. Just used that to show the rad cap was all good. The compression leaks thru the head gaket into the cooling system pressurising it causing the coolant to overflow.

 

 



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fray


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The head is now at PJME being skimmed dropped it off this morning he said he would ring me in a couple of days when its done.

Genuine yammy gaskets on order since yesterday, fingerz crossed the head and gasket will be ready for friday so i can get it running on sat.

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fray


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Got my genuine yammy had gasket yesterday, the difference between the pattern one and the genuine one is massive id 100% reccommend a genuine part over pattern. The pattern is way floppier and thinner metal. Also the gen yammy gasket is black and the patterns are silver or grey.

PJME have said the head should be ready to collect today so fingerz crossed my bike will be running again 2moz and i wont have any similar problems in the future!!



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conn1987


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good luck mate fingers crossed

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fray


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Cheerz buddy!

I got the head back this afternoon, the bloke said it was badly warped so it sounds like that was the problem.

Got home quite early so i though bugger it ill do it 2nite. It all went well i tightened the head bolts up in the correct sequence etc, only took about 30 mins in total.

She stared fine, took her for a quick 8 mile rip and it was sound. No leaks, temp stayed at 1/4, no water out overflow and it ran really well.

Im gonna get some miles done over the weekend to give it a test. Hopefully that will be it now with these bloody head gaskets going!



-- Edited by fray on Thursday 22nd of April 2010 07:50:22 PM

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craigbulmer


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yeah ive never seen a pattern gasket for a DT, but ive seen other around garages, thin as anything! genuine all the way.

yeah good luck.

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craigbulmer


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oh right, good!


hopefully its all good and is sorted.

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fray


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Cheerz craig yeh im hoping its sorted now. Turned out u was right wen u commented on facebook the head was warped!!! The engineer at PJME said its very common in dt 125's

I wanna know how it got warped tho as it never went into the red on temp while ive had it.

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dudley


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fingers crossed for you mate.

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fray


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dudley wrote:

fingers crossed for you mate.



cheerz matey!!



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fray


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Done 100 miles so far and all is well. Beat my top speed yesterday aswell managed to hit 80. 75 was my fastest before smile.gif

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carl13671


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take it easy on it fray,the honing that the borers finish the cylinder with takes a while to bed in with the rings,or the bore gets polished.

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fray


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I havent had any work done on the cylinder tho. Ive had the head skimmed and fitted a new yammy head gasket.

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carl13671


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Sorry mate,
i was thinking of another post,it doesnt take much to confuse me.

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fray


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No probz. Same wiv me mate!!

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craigbulmer


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yeah, rag away mofo'!

glad to hear its sorted.










P.S................................


told ya so!!!!!!

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carl13671


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me too

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fray


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lol @ craig!!

Cheerz mate hope it stays like this. Really pleased with hows its running now. Those are the dreaded last words tho, everytime i think to myself shes running well another niggle will appear! I think im due a few months hoonage time now tho!! lol

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carl13671


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Youll be sorted now,
Like i said earlier i had 3 gaskets and all failed,i skimmed my head and a genuine gasket sorted me out.Its nice to ride without water pissing out everywhere.
Im like you now waiting for the next thing to go wrong.

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fray


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Too rite mate it ay half!! Pissed me off seeing water pissing out the overflow all the time.

Yeh defo mate about waiting for the next thing to go wrong! Im just hoping itll let me have the summer without somet happening!

Im pretty sure this problem is sorted now tho, ive given her 100 miles hard riding and shes been spot on.

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craigbulmer


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yeah, im very happy with how my bike is running now, it feels like something is gonna go, my wallet is too happy, bike will want to be sorting that soon.......


although!!! at the rate its EATING fuel atm, there wont be much money left!!
cuz im hooning it pretty much everywhere, addicted to pinned powervalve, not good.

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dudley


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but i bet it puts a right cheese smile on your face when it kicks in lol

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craigbulmer


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hell yeah!!!!!!

i love it, pulls like a fecking train!

powerband from 6k, lovin' ittttt

with this pipe its not so bad under 6k .. i like .. sounds like a motocross bike to.. love it (dont love the fuel bill though!)

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