DT125R ARCHIVE

roadyz · DTR Member

Overheating problem / excess oil

GADGET · Guru

hello fella

the oil seal can be removed from outside so no probs there.. carfully screw two small screws into it and pull it out with pliers ..this way you wont scratch the seal housing by digging it out out with a screwdriver ..then use the old seal to push the new one in

the water comming from the frame is the expansion bottle overflowing it has a small tube that goes into the frame so it can flow to the bottom instead of all over your wheel

its normal like that and needs no fix

is the temp gauge saying its overheating or just water coming out??????

Energized · DTR Legend

How i understand it u've topped up to much coolant and its seeping down the frame via black tube out of the drain hole?

roadyz · DTR Member

thanks for the sound advice.

what i dont understand, is when the bike overheated, there was still lots of coolant in the expansion vessel but the rad was empty. also even when it was roasting hot the expansion vessel liquid was cold. could it need bleeding?

thanks

roadyz · DTR Member

GADGET wrote:
is the temp gauge saying its overheating or just water coming out??????

the bike was overheating it heavy red lined a coulpe of times, and it was found to be lack of coolant in the rad, it says (haynes) you are supposed to fill system via expansion tank, but his was full already

GADGET · Guru

is it smoking alot ???

sounds like head gasket trouble

if pressure is pushed into the coolant system it pushes all the coolant out through the overflow and into vessle buy the time it gets noticed the coolant is cool

check for coolant leaks all over the bike

and check your sparkplug colour so we can make sure of why it overheated in the first place

let us know

roadyz · DTR Member

Hey gadget, there doesn't seem to be any other coolant leaks as far as I can see. As far as smoke , on startup and until warm there is smoke, but it didn't look anything unusual as it does clear. Last time I changed the plug it had quite a bit of carbon ( black) the head gasket thing has got me thinking, when I took the rad cap off there was a build up of what I can only describe as congealed oil, gaskey could be gone?

DT-R_bradders · Guru

could be your head gasket m8y mine has done it twice now , and wen the gaskets gone it pumps coolant out from the expasion bottle,

louisBOSS · DTR Senior Member

myns doing this ,

ive got a new gasket , head skimmed, doesnt bubble, but it over heats , but there isint alot of coolant gone , there is something .

GADGET · Guru

hey roadyz

check your oil filler cap for signs of water or sluge so we can rule out internal water pump gasket/seal

the head gasket could make it overheat with no signs of water leak but just how much of this gunge was in the rad???

roadyz · DTR Member

roadyz wrote:
the bike was overheating it heavy red lined a coulpe of times,

Sorry, yea it was at the top of the red band for 10 or so mins

roadyz · DTR Member

Gadget i would say roughly about half a bottle top (coke bottle etc)

I dont see any residue on the oil cap.

I think over the next week i will run the bike, monitor levels and temps etc.

GADGET · Guru

ok no sludge in oil is a good sign smile

and only a little oily in rad is still pointing to head gasket

deffinately keep checkin the levels and update us if you get the chance

howd you get on with the oil seal bud??

roadyz · DTR Member

got as far as looking up the code. think its this :

http://www.wemoto.com/bikes/Yamaha/DT_125_R/98-00/picture/Drive___Output_Shaft_Oil_Seal/

GADGET · Guru

just put one of those in dtdan's engine and will confirm code tomoz

roadyz · DTR Member

so took the bike out today after temp was warm but not in the red. heard a pop (like sombody poping champagne) stopped and found that the coolant res cap had blowen clean off. the cooland seems to bubble as i rev higher. There is a oily residue in the coolant res. the coolant level was 'normal' untill i opened the rad - and it all dissapeared. what i donr understand is shouldnt the level in the res reflect the true level of the rad ? seems that the head gaskey is indeed away though :( Next thead is dt125 rebuild project!! :)