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The usual smoking question

  • Thread starter Thread starter Nuggets
  • Start date Start date
N

Nuggets

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Not to bore yall with another one of these questions but Im at a dilemma. Bike was burning oil pretty bad awhile back. So replaced the piston rings and valve seals. Smoking has decreased greatly but it still seems to do it after about 15 mins of riding and when Im at a redlight for a few seconds. It isnt alot and when I get back up to speed it stops again. No idea what else to do. Ive been rebuilding car engines all my life so Im wondering if there is something Im missing in this engine. 82 GS850g. Pods, jets 2 sizes up (if it matters).
 
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How long ago did you do the rebuild? you state it starts smoking after about 15 minutes of riding , and when you get back to speed it stops.How much oil was it burning before the rebuild and for how long did you run it like that? It sounds to me like your exhaust has oil built up in it and when it gets hot after running about 15 minutes , or gets hotter sitting at a light , then cools as you are riding down the road. Take it out for a good 4-5 hour ride and burn the pipes out good and see if that helps. I have a bike here that has that problem.
 
Sorry didn't catch that he had done the stem seals.

He could have damaged them upon installation.

To the OP...
Did you measure the valve stems and the stem to guide clearance? Piston diameter, cylinder diameter and taper?
 
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Trust you honed the cylinders before installing new rings?
 
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I forgot to mention that its only cylinder #1. Its always only been just that cylinder that smokes. (however I did replace everything for every cylinder). And it is burning oil cause I can see it on the plug. I did do a very light honing before hand. And the rebuild was quite recently.
 
What did you find wrong the first time? broken ring? bad valve seal? worn rings? , cracked piston? there was something causing it the first time, and if you did not find the problem than that is probably the same problem. When you reringed you staggered all the ends of the rings right? if you lined them up that will cause blow by. Have you done a compression check ?, make sure you do it hot.
 
Is it the stock bore or a bigger bore piston did you check the cylinder for being out of round. Any chance you installed a ring upside down? What grit hone did you use to hone it?
 
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Stock bore, dont remember the size of the hone, but it was very light because the cross thatching was still very very clear. I originally thought it was the valve seals because there was oil on top of the intake valve. I replaced them and still the same thing. Im thinking Ill just take it for a few hours ride and see if the rings will form right. Because since replacing the rings and seals Ive never been on it for more than 30 mins. And yes the rings were installed the right way up. I took great measure to make sure I found the marks on them. (yes and made sure they dont line up with each other)
 
"Very light hone" job doesn't get it done. Not sure if this applies, but new rings need an even and uniform hone job with a 240-320 grit dingo-ball hone. Flat bar hones are good for new cylinders, not used. During break in, you need to use the throttle liberally to push the rings into the cylinder wall and seat them. Without surface roughness the rings won't seat.
 
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Ok well lets by hypothetical for a second. Lets say that each piston got the exact same hone job, same ring job, and same valve seal job. So why is it that cylinder #1 is still the only one that smokes at all?
 
When I did the cylinders on my G last Spring (valves, valve seals, rings and hone) I followed the advise on this site

http://www.mototuneusa.com/break_in_secrets.htm

and just rode the pi$$ out of it as per the article. Got 8K on the engine since and all compressions are in the 160 range and she only uses about 8 to 12 oz. of oil between changes no matter how I ride it. Runs like a new one. :D
 
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Hmmmm maybe that was my problem. I deff took it real easy for the first few days.
 
That mototuneuse recommendation is a little over blown in my view. Millions and millions of engines are put into service each year and only a few have problems with rings not sealing, and very few are broken in like those guys recommend.
 
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