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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Oil leak from header
Post Info TOPIC: Oil leak from header
AusTTR


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Oil leak from header
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Hi all im new to the forum and have a 2009 TTR250 which I have been restoring. I have rebuilt most of the top end and other bits and pieces and have loved reading and learning from all the great info on the forum and have found it to be most helpful so many thanks to all for that.

I have finally gotten to ride the bike after the rebuild and found the I have what I believe to be an oil leak from my exhaust header. Its not pouring out but is moist and smoking mildy. I replaced piston and rings, new valve stem seals, ground the valves back in and re shimed the valves. I used assembly lube I don't know if its that just burning off if I have some sort of leak or the other thing is there suppose to be some sort of gasket between the header pipe and cyclinder head because if so mine never had one and would this be the cause?

Would love some input rather than blindly pull things apart after having just put it all back together any help would be greatly appreciated many thanks

 

Scott 

 



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TTRfan


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Hi Scott and welcome to the forum!

My guess is that your decompressor plug is leaking. See an example of this below:

Oil_seal 007.jpg

 

If that is the culprit then there is an easy fix - see http://www.ttr250.com/Replacing_cylinder_head_oil_plug/TTR_oil_ali_plug.htm

Brian



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AusTTR


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Big thanks Brian your spot on have just had a good look at it and Im certain thats it. Just have to do something about it now!!!

 

Many thanks Scott 



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Bearone


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Hi I'm a New (new for me) 2004 Yamaha TTR-250 owner here in USA but I have an oil leak and needed some advice. Not sure where oil is coming from

 



-- Edited by Bearone on Tuesday 8th of November 2016 01:41:59 AM

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Bearone


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Going to try and get better pictures today I cleaned it as good as I could and I will have to run it to see if I can locate the oil leak better.

Its somewhere around or above the decompressor plug . is there a head gasket there?

 



-- Edited by Bearone on Tuesday 8th of November 2016 01:40:45 AM

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TTRfan


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If the leak is in the area of the exhaust then it can only usually be two things (a) the decompressor plug (most likely - see my photo in an earlier post on this thread) or (b) the cam cover gasket (less likely).

Brian



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