Horizons Unlimited - The HUBB
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Horizons Unlimited - The HUBB (https://www.horizonsunlimited.com/hubb/)
-   Yamaha Tech (https://www.horizonsunlimited.com/hubb/yamaha-tech/)
-   -   Yamaha XT 600 (start-up smoke) *video* (https://www.horizonsunlimited.com/hubb/yamaha-tech/yamaha-xt-600-start-up-87340)

jjrider 14 May 2016 15:24
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.

xtrock 14 May 2016 17:38
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.

danimalu 15 May 2016 08:38
Quote:
Originally Posted by xtrock (Post 538562)
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.
No! After the engine is warm ,and when i ride it. I have no smoke.

danimalu 15 May 2016 08:41
Quote:
Originally Posted by Jens Eskildsen (Post 538600)
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.

danimalu 15 May 2016 08:45
Tomorrow i will open cylinder head and change the valve seals.

xtrock 15 May 2016 08:54
Quote:
Originally Posted by danimalu (Post 538705)
Tomorrow i will open cylinder head and change the valve seals.
Ok good luck:thumbup1:

danimalu 15 May 2016 09:13
I am nervous about it. I do not know what to do..:( I hope to solve this problem of smoke.

xtrock 15 May 2016 09:44
Quote:
Originally Posted by danimalu (Post 538710)
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

danimalu 15 May 2016 20:34
No.I'm not doing myself this job. I have a mechanic that deals only with this kind of work

danimalu 18 May 2016 20:11
Hello again. It's bad,i mean bad bad. I opened the cylinder head and surprise one screw was torn and another screw worn and those two from rear was ok. I think this was the problem..in order new screws and tomorrow i restore the cylinder head threads. :rain:

xtrock 18 May 2016 21:38
Ok, take some pictures, we need picture of the head inside to tell if there is some difference to 3TB. Dont know what bolts you talk about, change the seals when its open.

danimalu 19 May 2016 06:34
Number 14 from here.These are the bolts

xtrock 19 May 2016 10:16
Explains the low compression, did you or the mechanic pull the bolts with correct torque?

danimalu 19 May 2016 20:10
Mechanic..

danimalu 19 May 2016 20:13
And that's why i think was the smoke .


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