dpreece Posted August 10, 2011 Share Posted August 10, 2011 hi can any one help me ive got a dt 125 i had gunk in my rad so i changed the head gasket and everything was fine. now after a week or so i have to keep topping up the water up and i got gunk in the rad again. and i havent got a clue why this is happening Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 10, 2011 Moderator Share Posted August 10, 2011 hi can any one help me ive got a dt 125 i had gunk in my rad so i changed the head gasket and everything was fine. now after a week or so i have to keep topping up the water up and i got gunk in the rad again. and i havent got a clue why this is happening what head gasket did you use...a black rubber coated one or a cheap copy all metal one? Link to comment Share on other sites More sharing options...
dpreece Posted August 10, 2011 Author Share Posted August 10, 2011 what head gasket did you use...a black rubber coated one or a cheap copy all metal one? it was a metal one. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 10, 2011 Moderator Share Posted August 10, 2011 it was a metal one. They are utter rubbish, and it would be good practice to apply a thin smear of silicone (about 1/4" wide) around the bore circumference on both sides before fitting. I would do this even with the much better genuine yamaha ones also. If the head gasket is 'passing' you will see a few drips of water appearing on the floor around the left footrest area because the expansion tank overpressure relief is connected to the frame spar on the left. with a very bad leak you will see bubbling in the expansion tank...almost as if it is boiling! Link to comment Share on other sites More sharing options...
dpreece Posted August 11, 2011 Author Share Posted August 11, 2011 I got it off eBay the 1 gasket was like cardboard and the other 1 was metal. Any ideas wer to get a rubber 1 from because I'm just might strip it Down again Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 11, 2011 Moderator Share Posted August 11, 2011 This looks like one, ask the seller http://www.ebay.co.uk/itm/Gasket-Top-Set-Yamaha-DT125R-TDR125-1988-2004-/280474351304?pt=UK_Motorcycle_Parts&hash=item414d92f6c8 Dont forget a 7mm thin smear around just the bore circumference both sides http://www.ebay.co.uk/itm/40G-CLEAR-SILICONE-INSTANT-GASKET-RTV-SEALANT-/140565596435?pt=UK_Body_Shop_Supplies_Paint&hash=item20ba5cc913 Link to comment Share on other sites More sharing options...
dpreece Posted August 12, 2011 Author Share Posted August 12, 2011 I've tryd looking for a rubber gasket but I can't seem to find one. I also spoke to my local garage and they reckon it might be my water pump seal gone because of the oily water in my rad does that make any sense to you?? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 12, 2011 Moderator Share Posted August 12, 2011 I've tryd looking for a rubber gasket but I can't seem to find one. I also spoke to my local garage and they reckon it might be my water pump seal gone because of the oily water in my rad does that make any sense to you?? I just posted a link to one...ask, the very fact thats it's black suggests ita a rubber COATED one to me as for water pump seal gone, this will give a milky appearance to the gearbox oil so dip it and see Link to comment Share on other sites More sharing options...
dpreece Posted August 12, 2011 Author Share Posted August 12, 2011 Yep my oil cap is a milky colour so it's a new head gasket and a water pump seal I need cheers Link to comment Share on other sites More sharing options...
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