DT125R ARCHIVE

madrevs · DTR Senior Member

expansion bottle not warming or mixing with rad

Calum122 · Guru

So long as you have a pipe going from the radiator to the expansion bottle and that your bike isn't overheating I personally wouldn't worry about. I don't think mine has ever gone into the expansion area. Only when the head gasket blew and chucked water out of it. Blowing off the cap

madrevs · DTR Senior Member

Ok thanks a member I spoke to on ebay recommended this forum looks like a good site.bike is turning into a bit of a project so will probably need a few parts here and there and some advice

Calum122 · Guru

Plenty of that about here. Jut ask

madrevs · DTR Senior Member

After fitting new temp sensor last night I have noticed the bike doesnt warm up when moving only when stationary could these 2 problems be linked thanks

MDK · DTR Legend

it will sometimes get hottor standing = no wind or air hitting and cooling the rad whats it like after a good ride say around 1 hr ?

madrevs · DTR Senior Member

After say half hour ride it was still sitting just above cold but if I stop at traffic lights needle will start to rise and then go down whenbi start moving again is it going to cause damage it running so cold

MDK · DTR Legend

do.s the rad or water actualy feel hot or warm tot he touch after rideing ? also I asume the zaust and engine are getting hot ?

maybe its again a sensor problem or the actual need or clocks giveing wrong readings .

-- Edited by MDK on Thursday 28th of November 2013 02:37:12 PM

dread123 · Moderator

Sounds like faulty sender or gauge there mate

madrevs · DTR Senior Member

Engine gets warm will try feeling rad when I get home do u think it could be caused by thermostat could I test the sensor by filling a jug with hot water and putting it in that
Thanks

madrevs · DTR Senior Member

Old sensor used to read boiking hot as soon as u turned ignition on anyone know what the water temp should be and will test it with a thermometer

carl13671 · DTR Senior Member

My vapor used to read around 155 degrees when at normal temp and went to 188 when spanked,if its reading "boinking"when its cold theres a problem with your gauge or wire.Follow the wire from the sensor and see if its touching an earth anywhere if not as said your gauge is boinked.

madrevs · DTR Senior Member

Old temp sensor used to do that new one juat reads luke warm unless stopped then it goes up to normal

carl13671 · DTR Senior Member

Try earthing out the wire to see if the gauge goes up??

madrevs · DTR Senior Member

Will try that and post back old temp sensor didnt work cos connector snapped off soldered it back on and red hot all the time new onevis a bullet connector where old one was a spade connector but managed to push the spade connector on wire over the bullet connector on temp senderconnector was quite dirty and corroded.also rad felt warm after ride but not too hot that you cant touch it but carb warmer pipes didnt feel very warm

MDK · DTR Legend

maybe you have a blockage somewhere and its not circulating water correctly ...

madrevs · DTR Senior Member

Have flushed it through all seemed flow nicely touched sensor wire on frame and gauge went straight to red have chopped off old corroded connector and replaced with buppet connector which is a nice tight fit will try it againin morning andbpost back results

madrevs · DTR Senior Member

After 13 mile ride this morning tge same fault was there is there a way of testing whats at fault touched wire to earth last night and gauge went straight to red is this normal and does this mean its the temp sensor

dread123 · Moderator

yep faulty sender unit mate by sounds of it

carl13671 · DTR Senior Member

Yeah mate bad sender or wire.

madrevs · DTR Senior Member

Will try putting it in a jug of boiling water tonight just to be doubly sure as least I got some idea of the temp if it starts to overheat.

carl13671 · DTR Senior Member

It won't work like that,have you got a thermostat fitted?
Its this you need to check is opening at temperature.

madrevs · DTR Senior Member

So might not be the temp sender what about using a a piece of cardboard to cover half the rad and see if it gets up to temperature

carl13671 · DTR Senior Member

I'm not sure about the sensors but the RE might be different as it only puts on a light when too hot instead of giving a variable reading,might be worth asking yammy.Atleast its not overheating.

madrevs · DTR Senior Member

Afyer riding home tonight 13 miles last 5 on dual carriageway way at 70temp gauge was still the same left bike standing for 15 mins took rad cap off and using a digital thermometer it read 43 degrees does this mean its not heating up properly.
Thanks
Also would this be the thermostat or something more serious

carl13671 · DTR Senior Member

If it was overheating after 13 mile if you took the rad cap off it would blow ya face off mate.
Personally I think your sensor is knackered,or your thrmostat is missing.

madrevs · DTR Senior Member

Nah its not overheating complete opposite gauge is reading cold all the time unless at a standstill then starts warming up.
Left it for 15 mins off after a good hard ride
Took off rad cap
Used thermometer to check water temp
Thermometer showed coolant at 43 degrees
Should it be hotter than this after a 13 mile trip.hopefully will get time to check thermostat tonight

dread123 · Moderator

missing thermostat and possibly sensor :p i agree

carl13671 · DTR Senior Member

Check for a thermostat 1st to rule this out,and if fitted make sure it works.

madrevs · DTR Senior Member

Ok will do that a bit later tonight and post back thanks for all your help.if thermostat isnt working can I block off half the rad with a piece of cardboard until I can get hold of a thermostat as wont do it any good running cool at this time of year surely