A forum for owners of Yamaha TTR250 trail and enduro bikes!

Members Login
Post Info TOPIC: Light blue smoke!!!!!


Veteran Member

Status: Offline
Posts: 70
Date:
Light blue smoke!!!!!
Permalink  
 


Hi everyone, A couple months ago I started my bike only to see blue smoke start coming out of the exhaust. It went away shortly after pushing in the choke. I let it go and just figured I'd do a rebuild this winter. But after the starting the bike several times throughout the past couple months i have noticed that the smoke comes and goes. one day it will pour white and blue smoke and the next none at all, and sometimes just a little bit. I thought it was the rings but now Im not to sure. Does anyone have any idea what it could be? outside temp maybe? thanks 



__________________


Guru

Status: Offline
Posts: 824
Date:
Permalink  
 

I’d be leaning towards valve stem seals 

 a bit of oil weeps past the seals and burns off the valve stems it’s not a lot of oil 

 



__________________


Super Guru

Status: Offline
Posts: 7160
Date:
Permalink  
 

If your TTR isn't using oil then it's likely VSOs as Les suggests. Although annoying, best leave them until you need to get the head off for another reason and replace them at that stage wink

If your TTR is using oil then it's a different matter. If significant then start to think about a strip down and fitting new rings or a rebore.

Brian



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ! 
 

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 



Veteran Member

Status: Offline
Posts: 70
Date:
Permalink  
 

Does anyone have an explanation for why the smoke comes and goes? That's what is really concerning me.

__________________


Guru

Status: Offline
Posts: 650
Date:
Permalink  
 

it is probably passing stem oil seals if you leave the bike stood for 4 5 6days it will look worse eather than leave it for a few hours try that

__________________


Veteran Member

Status: Offline
Posts: 70
Date:
Permalink  
 

I actually just went outside and pressure washed the bike. When I want out to get the bike it had condensation all over it. So I decided to wash it since it was already wet. When I started it there was almost nothing just a tiny little bit and it was all white smoke(from washing I think) so I think your right.

__________________


Veteran Member

Status: Offline
Posts: 70
Date:
Permalink  
 

Update: now that the temperature is back up in the 70s there is no more smoke upon cold starting.

__________________


Super Guru

Status: Offline
Posts: 1018
Date:
Permalink  
 

if you are only starting every few months... white 'smoke" could just be moisture in the pipe..
i think you need to use it to really get a idea if it is burning oil or not and if the blue smoke is
there all the time...

 

my TTR spends alot of time sitting unused... it will blow smoke till it is warmed up

then the pipe is clean...



...



-- Edited by petenz on Thursday 17th of May 2018 09:39:39 AM

__________________

 

.....................................................................................................

 http://www.kiwibiker.co.nz

Bikes... 06 TTR250 / 09 XT660R / 1977 Montesa Cota 348 MRR / 1979 Montesa H6 125 Enduro...

E-mail  xtpete@gmail.com

Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard