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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 24 Feb 2011
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I sometimes commute to and from work, its only 4km each way, the bike does fine. The plug is not you're solution.

Stock jets are 130/120 on a less flowing carb, you could still be WAY of. With my ninja ex250 carb I have 110 mainjets, and they are sliiightly rich (tested with lambda probe-thingy), even with an oversixe header, laser exhaust and opened up airbox.

Stock is 130/120, i had 140/130, it was way rich at WOT (15-20% too rich from optimal burn), and I couldn't even feel it, and my plugs seemed spot on, they were never black. I had to have it dynotested to see the real picture.

I even had to lean out my stock carb with smaller mainjets, and lower the needle in the secondary carb for better riding.

Rejetting like this is really fumbling around in blindness, and I will never rejet without beeing able to test it.


The pic you have there might as well be from a bike burning a bit of oil, theres 1000 scenarios that could cause a plug to look like that.

Lean out the mainjets some more, and have the bike tested. Think about how much time you have spent on building and adjusting the bike. Toss in the last few bucks so you can ride and be done with it.

Best wishes
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  #2  
Old 24 Feb 2011
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Jens, tell me your elevation from sea, temperatures winter and summer and humidity levels.

I've told you before that I don't want the sparkplug to be a specific solution..

As I've said before, all I want to do is get the jets sorted but until then a fix is also good!
And nope, no dyno's here so I'm out of luck on that too...
Last edited by bacardi23; 24 Feb 2011 at 23:43.
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  #3  
Old 25 Feb 2011
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Temperatures are for very finetuning.

At sea level, winter is typical in the freezing range, i would guess it averages around -10 to -5 celcius. Summer is around 20-25celcius, but we have thosse 30 degrees days aswell.

The humidity now is 69%. (freezing, so fairly dry.)

I tried to make a test with my lambda-thngy. I saw no difference at all, riding in the night with only just above 0C, and riding in the day in sunshine at around 18C.

This is the weatherforecast for my region in Denmark, just for the fun of it:


[url=http://www.dmi.dk/dmi/index/danmark/regionaludsigten/ssjylland.htm]DMI - vejrudsigten for Syd- og S
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  #4  
Old 27 Feb 2011
R.I.P. 25 November 2021
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Quote:
Originally Posted by Jens Eskildsen View Post
With my ninja ex250 carb I have 110 mainjets, and they are sliiightly rich (tested with lambda probe-thingy), even with an oversixe header, laser exhaust and opened up airbox.
What year of the Nija`s fit the XT`s Jens?

Mezo.
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Old 1 Mar 2011
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I actually think they all fit, there might be some jetting differences.

Mine was listed as to fit many model-years. Something like 1987-2003 or something like that.
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Old 1 Mar 2011
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Hey Jens, take a picture of those carbs...
let me see the choke mechanism....

maybe I can fit the choke mechanism from a ex250 on my rappy carb as they are both mikuni bsr's...
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