Overheat/Temperature Problems

soad · Two Stroke Sniffer Joined: 08 Mar 2005 Karma :

I currently own a 2004 Yamaha DT125RE. I am having some problems with what i think is overheating. If i run the bike for any amount of time the temperature light comes on. If i keep running it like this the bike becomes sluggish and sometimes cuts out and makes a scraping noise. The barrell is red hot at this point.

Does anyone know what is wrong?

I heard it could be the Mixture/Timing or a blocked Radiator/Dodgy water pump. But it is a pretty new bike, just 2004.

TOM M · World Chat Champion Joined: 18 Mar 2005 Karma :

Check to see wether there is any air in the cooling system
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SteWhit · Nova Slayer Joined: 10 Jun 2005 Karma :

You may also want to test if you thermostat is work correctly. Take it out the top of the head and tie a piece of string to it, boil the kettle and fill a mug up and dangle the thermostat in it - after a short time you should see it open. If it doesn't open then it needs to be replaced.
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Finglonga · World Chat Champion Joined: 27 Jul 2004 Karma :

cliff · Doctor Sicknote Joined: 11 Feb 2004 Karma :

More than likely that the thermostat is jammed closed. Do as Ste said with the boiling water. Try cleaning the radiator aswell and checking the whole cooling system for leaks or anything gay like cracks and bulges. Thumbs Up

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soad · Two Stroke Sniffer Joined: 08 Mar 2005 Karma :

Ok sorted the problem, there was no Coolant Liquid in the radiator. So i filled it up and gave it a start and the temperature light went off Smile

Now i have another problem, the bike seems to have very low power. And at top end it splutters and really struggles to hit 60!

It never used to do this... This has only happened after this overheat issue, any ideas?

Rob W · World Chat Champion Joined: 09 Nov 2004 Karma :

SteWhit · Nova Slayer Joined: 10 Jun 2005 Karma :

Depending on how long it was at running very high temperatures you may had warped the head or damaged the gasket or plug. Best thing to do would be to strip the top end down and check it all out and replace the stuff mentioned above. Also may be an idea to do the rings while you have the head off.
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Finglonga · World Chat Champion Joined: 27 Jul 2004 Karma :

Jamie. · World Chat Champion Joined: 27 Dec 2005 Karma :

soad · Two Stroke Sniffer Joined: 08 Mar 2005 Karma :

Ok thanks for your help. I am going to hand it in to a motorbike shop and tell them to rebuild the top end.

Jamie. · World Chat Champion Joined: 27 Dec 2005 Karma :

when you leave it in, be sure to tell them to give you a call when he has it in pieces, just so you can see what needs replacing. Theres a lot of coyboys out there you know, better safe than sorry. At Least tell him to keep the parts for you to see