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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 Alessio Corradini, on the Salar de Uyuni, Bolivia, of two locals

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


Photo by Alessio Corradini,
on the Salar de Uyuni, Bolivia,
of two locals



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  #76  
Old 10 May 2016
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Quote:
Originally Posted by jjrider View Post
As I had said last week already, please drain ALL oil, every drop of oil from your motor, tank, everything. Put in 1.8l ONLY, and Please forget worrying about that valve, please???

Run it several times over several days to notice smoke.

I Repeat,
Completely ignore that valve right now and everything you've heard of it, and drain ALL oil and add back in 1.8L, NO more. Run it ! please?
OK,tommorow i'll do that! thanks!
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  #77  
Old 10 May 2016
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So much to do) btw,yesterday,today was warm outside..and no smoke! Next step to do: i order some new valve seals.

anyway.thanks guys for your answers,really,thanks! I hope i can solve this..
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  #78  
Old 10 May 2016
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Quote:
Originally Posted by jjrider View Post
As I had said last week already, please drain ALL oil, every drop of oil from your motor, tank, everything. Put in 1.8l ONLY, and Please forget worrying about that valve, please???

Run it several times over several days to notice smoke.

I Repeat,
Completely ignore that valve right now and everything you've heard of it, and drain ALL oil and add back in 1.8L, NO more. Run it ! please?
OK,tommorow i'll do that! thanks!


NO NO NO dont run the bike with 1,8 liter oil!!!!!!!!
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  #79  
Old 10 May 2016
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YA ,Danimalu,

it would be 2.8L , I miss quoted the wrong bike amount .
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  #80  
Old 10 May 2016
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OK! ) Like i say,the weather is warming up,and until now i have no smoke..so something is there. If still smoke in future,next step..new valve seals.
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  #81  
Old 10 May 2016
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Originally Posted by danimalu View Post
OK! ) Like i say,the weather is warming up,and until now i have no smoke..so something is there. If still smoke in future,next step..new valve seals.
Like i said in my first post, have you checked the spark plug? If you dont burn much oil, use the bike like it is and live with a little smoke..
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  #82  
Old 10 May 2016
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I've been running my KLX for a while now with the bad seal , someday I'll fix it . You can change them without taking the head off . I have an attachment that hooks up to air compressor to pressurize the cylinder and hold the valves up , then with a finger style spring compressor take the retainers off and pop new seals in. Helps with no frame backbone right over the head.
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  #83  
Old 10 May 2016
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Like i said in my first post, have you checked the spark plug? If you dont burn much oil, use the bike like it is and live with a little smoke..
spark plug is ok with no oil deposit.
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  #84  
Old 10 May 2016
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If you just run it , make sure to watch the oil level carefully . Mine isn't a daily rider so it isn't as much of concern , but a daily driver can run low faster if not watched , depending how much it leaks. May never get any worse , may get horrible as the miles get put on.
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  #85  
Old 12 May 2016
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I wouldnt do all the job with new seals for the little smoke you have when cold, when plug is ok just ride the bike and enjoy. Check oil level from time to time, i have a little smoke from my thunderace when cold, but its no problem with oil consumption. I would say most cars and bikes gives a little smoke when startup with choke..Try to smell the smoke, if there is no oil smell its ok, you are talking about cold weather so maybe only condensation in the exhaust. I had a car with crack in the top end, water in the cylinder and alot of white smoke all the time.
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  #86  
Old 13 May 2016
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Checked the way smoke comes from my acer, its no smoke just when you start bike, but after a short time it comes and then after a short time its gone. So in my head thats condensation due to the hot air coming from engine, i dont know but seems logic to me. At night now we only have like 5Celsius, bike was hot last night.

Btw did you have someone ride behind you and check if there is any smoke when let engine brake down speed?Should be visible if you have bad seals.
Last edited by xtrock; 13 May 2016 at 20:55.
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  #87  
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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  #88  
Old 14 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 01:20.
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  #89  
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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  #90  
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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