dt 125 overheated and steamed can any one help?

wil1hit · L Plate Warrior Joined: 07 Dec 2009 Karma :

i have a dt 1988 been totally restored went out tonight and it overheated and steam bellowed what could be the cause please

oldbiker · Nitrous Nuisance Joined: 15 Nov 2009 Karma :

I`m not familiar with DT`s, but at a guess thermostat stuck and not opening.
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el_oso · World Chat Champion Joined: 17 May 2008 Karma :

Billing · World Chat Champion Joined: 12 Mar 2009 Karma :

I'd agree wit ha dodgy thermostat, in the end the one in my TZR was taken out (I found out from a mate of mine) It shouldn't do it any harm to run without a thermostat, from what I've been told it will just take longer to warm the coolant up initially Smile

Failing that, did you bleed the system? If it's got an air lock I'd expect it to over heat
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wil1hit · L Plate Warrior Joined: 07 Dec 2009 Karma :

thanks for the right direction folks will have a look the week end Very Happy

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

It could be lots of things:

It could be a poorly bled cooling system, a dodgy thermostat, or a blown head gasket. You need to try to find out if you have a coolant leak, and do some investigation before you decide on the cause. We won't be able to give you a definitive answer without more information though.

Is there a water leak?

What did the temperature gauge say?

Are all the hoses and gaskets tight?
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wil1hit · L Plate Warrior Joined: 07 Dec 2009 Karma :

temp said off the clock will try therm in pan of hot water, if thats fine will tryalternative flow from pump ill replace the head gasket anyway because they are only 6 quid can anyone advise best place 2 get thermostat if it is gone please

bladerunner · World Chat Champion Joined: 09 Sep 2006 Karma :

if it's non of the above then check things like is the rad cap sealing and are there any air leaks in the reed block etc causing it to run lean etc...also possible crank seal failure if it like I said any of the above!!
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oldbiker · Nitrous Nuisance Joined: 15 Nov 2009 Karma :

the_godfather and bladerunner,
both list other things worth looking at after you check the stat, although I don`t think that an air leak or dodgy reeds are the problem (they would show up as tick over problems and very pale deposits on the spark plug)

For yam spares I check fleabay or the interwebnet thing, and often end up buying from stinkwheels or yambits (both good dealers)
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