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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 26 Jun 2010
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Oil leak XT 600

Now when I finaly got my XT running again I discover a oil leak, first it looks like the casket on the left engine cover was damaged. I took of the cover and replaced the casket, filled her up with oil and started her up. After a short while it was leaking oil again, after a closer look I did se som oil underneath the starter and when I rev it I did also see some smoke. It seems like the pressure from the Crankcase is coming out in the aerea under the el-starter, it`s a kind of splattering oil out.
Anyone that have a idea what can be wrong ?
The only thing that have been done with the bike is taking of and mount the left side cover.
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  #2  
Old 27 Jun 2010
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hi there pull the crankcase breather hose of the airbox end and start it up and see if the pressure comes out of it . the smoke /oil mist should come out this end not under the starter or engine outlet . if all is well now you must have a blockage where it conects to the airbox , dont run the bike with a blocked engine breather or you will run in to all sorts of problems . zigzag
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  #3  
Old 27 Jun 2010
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I`ll check it first ting tomorrow. Thanks :-)
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  #4  
Old 27 Jun 2010
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Hej,

you also find 2 rubber gaskets (o-rings) behind the left cover - make sure not having missed or damaged one.

Good luck!
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  #5  
Old 28 Jun 2010
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I did`t see any o-rings except the one on the starter, can you tell me where they should be ?
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  #6  
Old 28 Jun 2010
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Hope the pic will do
Attached Files
File Type: pdf XT600.pdf (161.1 KB, 331 views)
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  #7  
Old 29 Jun 2010
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zigzag : the breatherhose is ok but it`s still leaking so I bought me a dentistmirror so I can see underneath the starter.

bubbla : Are you sure there is o-rings in this position because I cant find any rings in the partscatalog for the bike and there was no rings there when I took of the cover, there is only a casket and the rubber fore the wiring on the stator.
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  #8  
Old 29 Jun 2010
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hi there i think the starter motor should have a o,ring where it fits in to the crankcase this could be faulty but its unlikely may be worth checking though , with mirror you should see things better . zigzag
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  #9  
Old 30 Jun 2010
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....there are for sure 2 o-rings on all XT550/600 -electric or kick does not matter. Part-no: 93210-13361.

Use this link: http://www.xt600.de/xt_werkstatt/_te...-600-3tb-2.pdf

on page 9 ( crancase-cover 1) you'll find the picture you need, o-rings are #8
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  #10  
Old 30 Jun 2010
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Aha, now I see it. There were no o-rings on the old cover as I can see. Today I used a mirror to try to locate the leak but it was hard to see anything, it looks like it`s under the starter in the area where the breatherhose is. I will try to take out the starter and see if it`s easier to see where the leak is.
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  #11  
Old 23 Jul 2011
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Picking up this old tread, I finely had some time to have a look at my XT again.
Now I took of the statorcover and the starter to see if there was any cracks but did`t see anything. Put everything back together and start her up and there is still leaking oil but now I did see moore acurat where the leak was, under the starter there is a rubber pice that the starter is resting on. Under that rubber the oil was coming from, in this area ther is 2 bolts that hold the engine together. Is there a casket that can be blown or do someone have a good explanation why it`s leaking there. And if anyone have good idea how to fix it so I can enjoy my XT until I have the time for a rebuild or swap of the engine.
The picture is showing the area where the leak is.
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Oil leak XT 600-p1020238.jpg  

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  #12  
Old 23 Jul 2011
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Hi, First try tighting those 2 bolts on the main oil line you can see. If that does not work there is a rubber O ring(Gasket) on that fitting where it is attached to the engine that may need replacing.
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  #13  
Old 23 Jul 2011
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The oil is most likely not coming from there!

Remove the e-start motor, remove little e-start cover on the cranckase.
I bet you are missing one bolt right there behind the e-start motor "sprocket".

Also, Check the rubber tube that connects right between the e-start motor and cylinder on top of the crankcase.

If it is cracked or not securely fitted it will also leak!


Vando
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  #14  
Old 24 Jul 2011
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The bolts are tight and it don`t look like the oil is coming from the starter seal but I`ll check up if there is a missing bolt behind the starter sprocket.

When the engine is running I can see it`s bubbling oil under the rubber piece between the engine and starter and I find that strange.

The breather hose is changed and I can`t see any leak there.

Thanks and I`ll have a look at it when I`back home in a few weeks again.
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  #15  
Old 4 Aug 2011
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Finaly my XT is back on the road.

bacardi23 you where right, it was a missing bolt right there behind the e-start motor "sprocket".

Thanks a lot.
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