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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 18 Jun 2004
jim jim is offline
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carb sync troubles...

The Mzungu has another dilema...

I cant get the card sync right on my 34L, I know the 6mm drill bit trick, but it doesnt work: if I do that then when the carb is full open my secondary butterfly is way past horizontal. At the moment Ive set it so that on full throttle the "valve" is horizontal, this means it begins to move way after 6mm.

Im in Uganda at the moment and this problem has been with me since Cape Town. On the advice of a friend I have put a #80 carb jet from a car into the pipe that joins the 2 carbs. I guess this acts as restrictor of fuel. This works well in that the splutter-cough problem at +4000rpm has gone. Trouble is that I dont have the extra power i need for sand as second carb is starving.
Any info would be appreciated!
Jim
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Old 18 Jun 2004
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My advice is get everything back to standard. If your carb is not damaged or worn out this should work. Don't forget also to adjust the maximum opening of the 1st carb, this affects the butterfly opening of the 2nd too. If you get effects like too poor or too rich when firmly accelerating, adjust the needle of the 2nd. When you hear too much noise from the exhaust, it's too rich, when the bike doesn't accelerate immy, it's too lean.

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Old 20 Jun 2004
jim jim is offline
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Thanks Fred
My Clymer Manual does not explain adjusting Primary carb... It makes sense that this is the problem. Can you or somebody explain teh procedure??
What setting is standard for the Needles?
THANKS!!
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Old 20 Jun 2004
jim jim is offline
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Sorry, i lied, my manual does explain primary adjustment...
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Old 21 Jun 2004
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Jim, Jim, Fred is right, the Yammie's are standard as good as they can be, so no advantage to be had from tricks.
Standard setting for the carbs; look in www.xt600.de, Vergaserspezial, at the bottom there is a link to a list of settings.
Re your splutter problem @ 4000 rpm, I had the same, after a lot of far more expensive things I just cleaned the air filter. Which helped. Remember, the intake is just above your rear wheel, the dustiest place in town. Cleaning of filter at least every two, in dusty conditions every day. Rinse in petrol three times, then lightly oil with engine oil.

Auke
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Old 21 Jun 2004
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Thanks Auckeboss,
Every second day i curse you and your rule as i wash sticky filter oil from my hands!
Ive still got a spot of the real stuff (Yamaha Filter Oil), but when it finishes wouldn't I be better off using thick gear oil than regular engine oil?

Jim
PS Carbs are coming off soon to set back to std, hope it works!
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Old 22 Jun 2004
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Good to hear people far, far away think of me all the time, or at least every two days.
Recommend just to use engine oil. You already have it with you, and it is sufficiently effective.

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