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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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Old 3 Feb 2008
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Mid 80s TT600 carb jetting specs

After my XT600 starting problems and then motor problems,I found out why the float level had been set so high.The head has been ported quite signicantly and that combined with the two brothers muffler has made someone play with the fuel level,but not the jetting.
So I got told for a base level,to try some TT600 jetting since they're a bit more free flowing than the XTs.
So,next thing,can someone post up the jet sizes from a mid 80s TT carb please? That way I can get an idea of where to start with mine.
Also,would I need to change both carbs main jets? Or just the primary,or just the secondary?
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Old 6 Feb 2008
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Nobody can help with something technical as this?
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Old 6 Feb 2008
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Yobbo, changing carb regs is -shortly saying- a nightmare also for professionals.
I strongly advice you to find what are original setup values for your bike and start from there. But frankly it's a very complicated matter, done with tests over tests, removing carb every time, and the XT carb is NOT the easiest to remove....

At first tell exactly what model is your bike, (43F 2KF 34L etc etc), so we can understand what is you original carb (not only jets ar different, also carb diameter).

If possible, maybe you can try then to completely substitute your carb with another.
Playing with jets and nozzles is not an eazy game at all, you would only lose your time.
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Old 6 Feb 2008
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Ok,I'll start from the start,again (an older post has post has most of the details.)
This big pig (1VL Tenere) has problems starting.
Floods very easily.
So I decided to pull the carbs out and have a look.
Float level was set very high,17mm.So therefore it was dumping a hell of a lot of fuel in,hence hard starting.
I changed all the settings back to standard,except I only changed the float level to 22mm,rather than 25-28 for stock,just to be on the safe side.
Jets are all standard,none have been drilled out,needles are stock too.
Now when I put it all back to standard it coughed and farted.Fine,I'll richen it up on the needles.No matter how much I dropped the clip down the needle,it wouldn't fix the bad (lean) running.
Put everything back to the way it was and it ran fine again.

Now come to part two of the story...Couple of weeks ago I had a nasty crack in the r/h crankcase.
Motor out job,so able to inspect a few things.
Noticed the head was heavily ported.A Ha,that must be why the carbs have been played with.
Plus the fact its got a free flowing muffler makes me think I should be looking at a TT600 for jet sizing as a base level.
I did find some specs,for a 2003 model. They ran a 150 & 145 main jets.Makes me think I should bump up my primary to a 150 and try the secondary at say a 135,working up to the 145 to see how it runs.

That enough info now?
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Old 11 Feb 2008
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Still no takers?
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Old 11 Feb 2008
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Here it is

german, but figures are figures.

Wartungsdaten TT600-Modelle

BTW, if it is only hard starting it is not the main or secondary jets / needles. Just the choke and idle circuits. Check these first. The idle setting should be richer than advised by Mr. Yam.

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