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Blue smoke after rebuild

  • Thread starter Thread starter Guest
  • Start date Start date
Took her out for a ride this afternoon, put her through the gears. The bike really performs well, and so smoooothhhh. Anyways, started her up and a cloud of blue smoke, basically like you're starting a small pile of leaves on fire. I immediately dropped the choke and it did help but mostly I think the smoke decreased due to the drop in RPM, interestly enough the smoke disappeared a lot quicker, maybe half a minute or so. Ran it through the gears on the 60km ride. Came home and there's no smoke of any kind while it sits and I throttle it, again I'll try starting it cold later tonight or tomorrow morning and see what it does with no choke. Pulled all the plugs and they are all a perfect tan, very nice to see. My idea of seating the rings is ride it hard, lots of different RPM levels, hard accel. and hard decel. There is no chance I put the rings in upside down, lol, believe me I checked.
 
If it did not smoke right after the rebuild the wobble on a valve may have taken out a seal. What plug has oil on it? Is it the same cylinder that had the valve that wobbled?
What about a cracked head? All the rebuilds has used the same head right?
 
None of plugs have oil on them now. I checked the head as close as I could trying to find a crack but didn't see any I doubt that's the best way to find a crack. Yes all the rebuilds but the first one have used the same head. The first head never had any blue smoke on cold start but I can't use that head as it kept breaking cam cover bolts, 4 in total.
 
azr said:
There is no chance I put the rings in upside down, lol, believe me I checked.
Click to expand...

Nope, Not if the smoke goes away completely after running it for a while.
It has got to be the valve guild seals. For reasons already mentioned valve wobble will make them leak. Everything is stock motor parts? Is there a chance you got the wrong size valve guild seals or they are getting damaged on install. But your gonna have to pull the head to check the valve wobble.
 
Second cold morning start up. Started her up without the choke, a lot less smoke but still some blue smoke. I ran it for a very short time without the choke then started her up with the choke, about the same amount of smoke, maybe a bit more but not much. Overall there was a lot less blue smoke this morning than yesterday no doubt about that. I'm going to consider this problem 'fixed' for for now anyways. I'm going to change the oil now and then in another 500km or so and at that point I'll report back with any changes, be they improvements or not.
 
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