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STARTED SMOKING !! STARTED SMOKING !!
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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.
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  #1  
Old 27 Jan 2006
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STARTED SMOKING !!
Hi, rebuilt my 3aj a couple of months ago(crank bearings,timing chain,rings,valve seals) bikes been running fine until the other day. it starts fine but requires some playing with the throttle to keep her running until she,s warm. on startup yesterday,after 30 seconds it just started pumping out blue smoke!! when its warmed up the smoke is not as bad,more of a slight haze. anyone got any ideas whats wrong? thanks T
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Old 28 Jan 2006
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sounds like oil is getting past the piston rings and burning with the gas.If the rings are worn, not seated properly, or mismatched with the cylinder bore then this could be the problem.Also,if the engine was rebuilt with a break in lube of some type, then this might be the cause?
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Old 29 Jan 2006
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found the problem,removed the rocker cover & had a look at the valve springs.one exhaust valve seal had come off the valve guide! (lesson to be learned here,make sure the seal is pushed all the way onto the guide!) T
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Old 17 Jun 2006
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Gday Guys.
I apologise for digging up an old thread, but i've only just found this forum and my bike is misbehaving in a similar fashion to what is described above.
About 10 to 20 seconds or so after startup, my bike blows an amazingly bad amount of blue smoke from burning oil. The bike is a 2002 model XT600, which I bought brand new myself just over 3 years ago. At the moment, it only has about 14000kms on the clock.
A couple of weeks ago, I took the bike back to yamaha for a check-up and they confirmed my suspisions, that it seems to be a valve stem seal problem. They did a compression check also, which came back good (140psi), so that pretty much rules out the rings and bore as the cause of the problem (I hope!).
Once the initial smoke blowing is over, the bike runs as clean as a whistle and when i check the dipstick, it doesn't appear to be using much oil at all.
After reading Big T's last post, do you think it is possible that one of my valve stem seals has just popped up off of the valve guide???? If so, does the head need to be removed to remedy this?
Thanks in advance, Dan.
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Old 18 Jun 2006
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unscrew the valve adjust covers , two round ones in the front and a larger one for the intake valves facing the rear. peek inside with a flashlight and one of those itty bitty dentists mirrors.. you should be able to see the seals
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Old 19 Jun 2006
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Thanks Laromo.
That will give me something to do this weekend.
If I do find that one of the stem seals has come adrift from the valve guide, can it just be pushed back down easily into its place, or would I need to be removing the rocker gear and valve springs to get to it?
Thanks again, Dan.
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Old 19 Jun 2006
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Hi Dan, think the reason my seal came off was because i used pattern ones, genuine yam ones are a far better fit. however i,m afraid it,ll be a head off job if you intend replacing them! just an update on my 3aj,s smoking habit, i got the barrel professionally honed, rebuilt her(again) and it,s still smoking as bad as ever!!! i have now given up! anyone wanna buy it ? hope you find a cure & if so i,d like to know how. cheers T
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