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Oil leak problem. Oil leak problem.
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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.
Photo by Andy Miller, UK, Taking a rest, Jokulsarlon, Iceland

I haven't been everywhere...
but it's on my list!


Photo by Andy Miller, UK,
Taking a rest,
Jokulsarlon, Iceland



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  #31  
Old 2 Sep 2013
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It's an '88 US model. This particular year the needles can't be shimmed do to the holder and setscrew not allowing any up down movement of the needle. I was able to flip the one washer to the top to drop them a little but that's it. I was always thinking of making my own jets(the best solution), but time to do it plus the fact that I have the Raptor carbs to put in already, don't know if it's worth it. I see in parts breakdowns, other years have moveable needles, mine seem to be oddballs, probably why I have issues and most others don't.
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  #32  
Old 4 Jun 2014
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I still have problem with leak, done the sealing about 5 times now with different seals. Last i bought the yamabond with no luck, the leak is located in front right side at the innerscrew. Any good suggestion how to get this fixed? its not much that comes out, but its dripping down on the exhaust pipe..
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  #33  
Old 4 Jun 2014
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Hi xtrock,
I have no answer for you, i am replying just to say you are not alone with a leak in the area you have. Mine leaks since i replaced the valve seals two years ago. I used loctite 5920 amd i thought i was very careful when i was applying it
It was my intention to fix it when i could, but after reading about your trouble I may not bother

Good luck!

Bill
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  #34  
Old 4 Jun 2014
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None of the five motors I have together either in bike or was in a bike have that leak, though most do have some little seeps here and there, but no dripping. The area your talking about is the hottest area, right above the exhaust valves, I wonder if that has anything to do with it. I put my thermocouples there for watching head temp and there is quite a difference in temps between there and else ware on the head. I see 250 to 280F when going slow or stoplight traffic.

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  #35  
Old 4 Jun 2014
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Yes its hot there, but its not in the front where its hottest the problem is. Its more from that screw and towards spark plug, wonder if the cover is not straight enough at the point and seal is not enough. Most job with sealing this is getting the seal stuff off.. Ill give it one more shot and inspect the area where problem is, 10nm is not much on the bolts and if its not correct i recon to much pressure will squeeze the sealint out on the thinnest points.
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  #36  
Old 11 Jun 2014
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Ok here we go again, sealed again this weekend and waited 3 days before use. Same spot around the left screw, surface was straight, no damage and cleaned perfect. I cant see any leak when engine is only idling, must happend something when riding. Maybe i ride in hills and get alot of oil in front, but why only on this spot? Its all dry around the cover else, damn iam fed up with this leak......All bolts are tighten with 10nm.


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  #37  
Old 11 Jun 2014
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Is there any chance the oil could be seeping down the thread of the bolt?. Just a thought.


Bill
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  #38  
Old 11 Jun 2014
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Quote:
Originally Posted by awolxt View Post
Is there any chance the oil could be seeping down the thread of the bolt?. Just a thought.


Bill
I really dont know anymore what to think, all the seals around all the bolts are the same. The oil its not suppose to get to the bolts when sealed around and always the same spot.
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  #39  
Old 11 Jun 2014
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Can't remember off the top of my head if the hole is blind or not?...hasn't got too long a bolt in and its bottoming or running out of thread and shoulder bottoming out....good luck..
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  #40  
Old 11 Jun 2014
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Quote:
Originally Posted by marcm View Post
Can't remember off the top of my head if the hole is blind or not?...hasn't got too long a bolt in and its bottoming or running out of thread and shoulder bottoming out....good luck..
Everything is original, same bolt on both side.
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  #41  
Old 12 Jun 2014
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If it were me, I would thoroughly degrease the area & allow to dry.
Then start engine & adjust idle to approx 3000 rpm.
With the bike parked watch closely until you see the oil start to appear & that is your source.

Bob
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  #42  
Old 12 Jun 2014
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Do you set the torque when cover is set on engine or do you wait with setting the torque till its dry? I feel sick just giving it the thought about doing it again
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  #43  
Old 12 Jun 2014
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Quote:
Originally Posted by Bobmech View Post
If it were me, I would thoroughly degrease the area & allow to dry.
Then start engine & adjust idle to approx 3000 rpm.
With the bike parked watch closely until you see the oil start to appear & that is your source.

Bob
Problem is it doesnt come oil out standing like that, only when i ride. I know the oil is coming out at the front screw, but why is the magic question..I have stopped counting the times i have done this job.
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  #44  
Old 12 Jun 2014
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Set the torgue when cover is set on engine.
Before applying sealant you must remove all traces of oil with something like Brake cleaner or Carb cleaner.
Have you tried to find the leak standing at idle or 3000 rpm?
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  #45  
Old 12 Jun 2014
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Quote:
Originally Posted by Bobmech View Post
Set the torgue when cover is set on engine.
Before applying sealant you must remove all traces of oil with something like Brake cleaner or Carb cleaner.
Have you tried to find the leak standing at idle or 3000 rpm?
Yes i set torque when cover was on engine, and like i said i know where the leak is but problem is why its always comes at the same spot. Surfaces have been cleaned very good all times.
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