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How to replace oil valve? How to replace oil valve?
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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 14 Sep 2008
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How to replace oil valve?
I'm trying to get to the bottom of my oil burning on cold start up issues. Since checking the oil seems to be a mistery considering one second it's empty the next it's full, I am thinking the oil valve that keeps the oil in the tank is faulty. When the bike sits overnight perhaps the oil is draining out of the tank and into the crankcase so it wet sumps and smokes terribly until the oil levels out and is pumped back into the tank. So my question is how do you change this valve. I've read that it's in the right hand cover? Does my theory sound plausable?
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  #2  
Old 14 Sep 2008
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I wasn't aware of an oil valve. thought it was a convection driven circular system.
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  #3  
Old 14 Sep 2008
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Mystery
There is a valve, it is located in the bottom of the clutch cover. It consists of something that looks like a seal, a ball and a spring. It's function is to avoid that the oil in the channel going up to the head drains back with stopped engine. This way these sensitive parts get oil immediately after start of the engine.

I doubt that replacing this valve will solve your problem. The oil drains via the oil pump back into the sump; the valve only stops the flow up to the head. You could solve the problem by replacing teh oil pump that is worn so much that the oil can drain through but is by far not worn enough not to lubricate sufficiently.

My advice: just live with the smoking at startup.

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  #4  
Old 14 Sep 2008
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so if all the oil on the top half drains back to the lower, you don't think the over abundance of oil in the low end would cause it to burn it off and smoke until it gets recirculated and evens out. I also have read this valve is common to go bad, so what are the symptoms of a bad oil valve.

I see a lot of post about the xt600's smoking terriblely at start up, then some say the do a complete rebuild and it still does it. I have yet to read anyone post how or if they actually solved the problem.

Here is a video I posted in another thread. Notice how it runs for 20-25 seconds before it actually starts to smoke. I would think if it were a valve seal or guide, 1. it would smoke a little all the time, and 2. it would be imediate upon start up. I don't know maybe it is the valve seals :confused1:.

http://www.youtube.com/v/JGtAQLGjsPM
Last edited by skiboyracing; 14 Sep 2008 at 18:32.
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  #5  
Old 15 Sep 2008
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Agree
That when all oil is in the sump instead of the tank this could cause the smoking at startup. I can only explain why the smoking only starts after 25 s. is that it takes some time for the oil to get past the piston rings.
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  #6  
Old 15 Sep 2008
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...and for crank case pressure to build enough to vent to airbox.
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