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Yamaha XT 600 (start-up smoke) *video* Yamaha XT 600 (start-up smoke) *video*
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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 Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
Clouds on Tres Cerros and
Mount Fitzroy, Argentinian Patagonia



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  #1  
Old 13 May 2016
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It takes a couple of seconds for the bike to be hot enough to burn the oil. I remember than from back when I overfilled mine. My friend has an old TT600 and it does then same.

Enginebraking from cold, and /or from high rpm's should show smoke. Normal enginebrakeing (like from 3500rpm wont always show smoke on a hot bike.) But i've seen than happen with both bad piston/rings, and bad valveseals.

Its oil for sure.

You could do a leakdown test.

Ride it for the summer, keep an eye on the oil, and rebuild the bike when the weather turns bad.
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  #2  
Old 13 May 2016
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Buy a endoscope camera for your PC and check if you can see oil inside after a day or two, turn engine slowly by hand when checking inside so all valves have been opening.
Last edited by xtrock; 14 May 2016 at 00:20.
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  #3  
Old 14 May 2016
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A person can just look down the intake and exhaust ports , the valve(s) will be wet/oily , ,puddled if valve is closed. That's how I confirm them .
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  #4  
Old 14 May 2016
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I have no smoke from the XT in same temp, i see many people have issue with white smoke from the 4cylinder engines when cold. Hard to tell if its condensation problem in a big exhaust system or some oil, i always thought oil burning is giving a more blueish smoke. And specially if you rev it really high and let go you can see blue in the smoke, you see alot of old cars with that issue.
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  #5  
Old 14 May 2016
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I have and have owned 10 or so different brands/models of bikes, plus multiples of most, and ride in every weather imaginable and haven't seen any condensation smoke from any of them. The Only weather/temp thing I've seen is cold and high humidity in the right light , seeing a light puff coming out in pulses but dissipate within 2 feet and never a cloud or something that can be easily seen. There's only so much water that can condense an internal surfaces and it takes a lot more than that to create a cloud behind a bike.
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Old 14 May 2016
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Ok, but why is there no blue in smoke and no smoke when you slow down on gears, no smell of burned oil in the smoke either.

Out tested now, its about 50sec with white smoke, when holding hand in front it get moisture on it. I have a hole in the endpipe buttom and water is dripping out, the pipe was inside all winter so its dry and no rain on it.
Last edited by xtrock; 14 May 2016 at 18:34.
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  #7  
Old 15 May 2016
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Quote:
Originally Posted by Jens Eskildsen View Post
It takes a couple of seconds for the bike to be hot enough to burn the oil. I remember than from back when I overfilled mine. My friend has an old TT600 and it does then same.

Enginebraking from cold, and /or from high rpm's should show smoke. Normal enginebrakeing (like from 3500rpm wont always show smoke on a hot bike.) But i've seen than happen with both bad piston/rings, and bad valveseals.

Its oil for sure.

You could do a leakdown test.

Ride it for the summer, keep an eye on the oil, and rebuild the bike when the weather turns bad.

The engine was rebuild. New piston and rings,new valve seals. I have almoust 1300miles from rebuild.
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Old 15 May 2016
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Tomorrow i will open cylinder head and change the valve seals.
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Old 15 May 2016
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Originally Posted by danimalu View Post
Tomorrow i will open cylinder head and change the valve seals.
Ok good luck
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  #10  
Old 15 May 2016
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I am nervous about it. I do not know what to do.. I hope to solve this problem of smoke.
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  #11  
Old 15 May 2016
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Quote:
Originally Posted by danimalu View Post
I am nervous about it. I do not know what to do.. I hope to solve this problem of smoke.
Are you removing head or using compressed air so they can be replaced with head on engine? XT is easy job, the acer is 20valves so iam not doing it before i see the blue smoke behind.. I dont know if there is room for this tool with engine in bike?

http://www.ebay.com/itm/Universal-En...155519&vxp=mtr

Here is a video using rope metod

https://www.youtube.com/watch?v=B8WTTfkyW8g



And remember what JJ told you earlier:Actually common to have one damaged if not lubed or ends of stems not polished to get rid of any burr when sliding on new ones . They need to be slid on and seated very carefully.

With air:

https://www.youtube.com/watch?v=5ZNVKgD9ubA
Last edited by xtrock; 15 May 2016 at 10:19.
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  #12  
Old 15 May 2016
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No.I'm not doing myself this job. I have a mechanic that deals only with this kind of work
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