DT125R ARCHIVE

Members Login
Username 
 
Password 
    Remember Me  
DT125R Forum -> Tuning -> overheating need help1
Post Info TOPIC: overheating need help1
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
overheating need help1
Permalink  
 

hi there i got a 97 dt 125 and it is over heatingi would like some help please

i have changed head gasket to genuine one i put new pistong and ring in it bout week ago flushed out all hoses and the radiator put new 2 stroke and engine oil in it

i checked wether water pump work and it seems to all work fine

the temp gauge goes up to the red in a matter of seconds of riding it



__________________

yamaha fzr 400 exup and yamaha dt125r 96
ToySoldier


DTR Legend

Status: Offline
Posts: 3132
Date:
Permalink  
 

might be a broken temp gage or if it is defo over heating id say the thermistat


__________________
Dont Blame The Player Blame The Game
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

yh the coolent is boiling over tho and i put new thermastate init bout week ago aswell lol its doing my head in just want to ride it lol

__________________

yamaha fzr 400 exup and yamaha dt125r 96
ToySoldier


DTR Legend

Status: Offline
Posts: 3132
Date:
Permalink  
 

if the water is bubbling out the tank at the back its the head gasket so if you have changed it you head might be worped mine was bubbling out the back when i got mine i changed head gasket and its fine now =/

__________________
Dont Blame The Player Blame The Game
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

nah i mean when it is hot it boils over in radiator but how hot would it get if it goes to the red cause wen it gets to that point i can stil put my finger in the water with out it burning


__________________

yamaha fzr 400 exup and yamaha dt125r 96
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

also i did get head skimmed aswell


__________________

yamaha fzr 400 exup and yamaha dt125r 96
ToySoldier


DTR Legend

Status: Offline
Posts: 3132
Date:
Permalink  
 

if you can put your finger in it sounds like it bubbalin over not boiling so air is geting into the water from somewer

__________________
Dont Blame The Player Blame The Game
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

but would u say my temp gauge is faulty or dose it not get to hot eny way wen its in the red i thought it was gunna burn me but it didnt lol. wat sort of temp would it expand into the expansion bottle at the back


__________________

yamaha fzr 400 exup and yamaha dt125r 96
ToySoldier


DTR Legend

Status: Offline
Posts: 3132
Date:
Permalink  
 

i think the min it starts boiling/bubiling it will go into the expansion bottle im not sure about the temp gage as mine doest work lol but im pritty sure it will be air makeing it buble i would dubble check the head by takeing it off and checking the gasket has no streeks init and is defo not leaking

__________________
Dont Blame The Player Blame The Game
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

right just started let it warm up and went for ride wen i came back took the radiator cap of it was just expanding into the expansion at the back its not bubling its just expanding sorry but got it wrong bout it bubbling

__________________

yamaha fzr 400 exup and yamaha dt125r 96
ToySoldier


DTR Legend

Status: Offline
Posts: 3132
Date:
Permalink  
 

i havent a clue then mate sorry =[

__________________
Dont Blame The Player Blame The Game
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

ok cheers for advice tho

__________________

yamaha fzr 400 exup and yamaha dt125r 96
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

toy think your right bout the head still leaking presure into coolant system

when new gasket was fitted did you tighten up the head bolts bit by bit ....you know going from bolt to bolt until it was all done up tight?????????

if the coolant isnt even hot its gotta be presure for sure

hope this helps



__________________
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

yh i did lol i probs get new gasket eny way i have bought two head gaskets recentl coz some one told me the head gasket i put first one on still over heated then i put new piston init and put the second gasket on and still saying its over heating lol

__________________

yamaha fzr 400 exup and yamaha dt125r 96
DT-R_bradders


Guru

Status: Offline
Posts: 2165
Date:
Permalink  
 

I would take the water pump cover off and see if u can turn the impeller by hand if u can thts fooked the plastic drive gear on the other end of the impeller shaft , give that a check if that is the case then ur gonna over heat as coolant isn't getting pumped round .

__________________

             

 
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

that would explain the rad being cool aswelsmile

while you have the water pump cover off to check if you can move it by hand also see if it moves when you kick the bike over



__________________
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

right cant move it by hand but it does move while i kick the bike over does this mean it is working then?

__________________

yamaha fzr 400 exup and yamaha dt125r 96
louisBOSS


DTR Senior Member

Status: Offline
Posts: 236
Date:
Permalink  
 

yes,

did this to my bike today

always had a heat prblem , was most of them **** head gaskets

Now gonna put m 3rd good yammy one on thursday, but it works then gos months later or weeks .

So im going to get it skimmed thursday , and hope it solves the problem , and check the thermosta .....

__________________

       merry crimbo


                                    FSD"!"$£!"$
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

lol mine seems to just be over heating even tho every things working lol
ive spent quit a bit now on parts and i always use yammy gasket lol
i dunno why im still trying fix it now would of thought i would of gave up but i love 2 strokes lol

__________________

yamaha fzr 400 exup and yamaha dt125r 96
tripr


Guru

Status: Offline
Posts: 1053
Date:
Permalink  
 

sure your water pumps doing its job m8 are all the fins on the propellor intact .

__________________
tripr


Guru

Status: Offline
Posts: 1053
Date:
Permalink  
 

forget that m8 just spotted bradders beat me to it lol

__________________
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

ok when you take the head off to replace gasket get a steel ruler or a level and put it across the top of barrel.....then take a feeler gauge and see if it fits under any part of ruler/level ....do this all across the top of barrel in different places...if you can get the feeler gauge under the ruler/level then this meens your barrel is warped from overheating and it needs lapping flat



__________________
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

ok ill try that tonight i was just thinking it could be the temp gauge being faulty cause coolent isnt boiling hot its warmish so dunno lol


__________________

yamaha fzr 400 exup and yamaha dt125r 96
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

one more thing to look for

when bike is cold open rad cap ..then start the bike and look in the rad and you should see the coolant flowing into the rad just under the filler neck

this way you know for sure the coolant is moving around the system if not check all pipes for blockages and flush the system with a hose

make sure to bleed the system when everything is all full up again

good luck and let us knowsmile



__________________
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

ok cheers how do i bleed the system
ill let u know how i get on


__________________

yamaha fzr 400 exup and yamaha dt125r 96
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

ahhh this may be part of your probs

above the head is two pipes that go to carb..they have 8mm bolts holding them to the head

when bike is on stand one is higher than the other (the 1 with the thermstat housing)

get a 8mm socket and extension bar......open rad cap....then undo the highest 8mm bolt ..wait until just coolant is coming out and no air bubbles then tighten it back up

replace rad cap ...done

this can cause probs coz the temp sensor is outta the coolant and reads wrong



-- Edited by GADGET on Wednesday 15th of June 2011 07:50:32 PM

__________________
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

oh right i bet this probs is the problem lol cheers does it need to be start or not


__________________

yamaha fzr 400 exup and yamaha dt125r 96
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

no gravity will do it just remember to open the rad first



__________________
dansolo


DTR Respected Member

Status: Offline
Posts: 25
Date:
Permalink  
 

ok cheers i got no tools atm but will let u no wat happens thanks again lol

__________________

yamaha fzr 400 exup and yamaha dt125r 96
GADGET


Guru

Status: Offline
Posts: 1332
Date:
Permalink  
 

sorry forgot to mention you will only see the coolant entering the rad if you have no thermostat in when you do it ..but you can put it back in afterwards just dont rip the gasket ..its a good way to check the flow of coolant but can end up costing you a thermostat gasket ...but atleast youl know

while you have thermo out chuck it in a cup of boiling water to see if it opens



__________________
1 2  >  Last»  | Page of 2  sorted by
 
Quick Reply

Please log in to post quick replies.
DT125R Forum -> Tuning -> overheating need help1
Tweet this page Post to Digg Post to Del.icio.us


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard