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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.
Photo by Lois Pryce, schoolkids in Algeria

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  #1  
Old 29 Jun 2010
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Ok

The first carb with the slide is there for low end running. the second card is of the CV Vacuum type. This CV carb comes into opperation when there is a high demand from the engine.

This will happen approx around 4-5000 rpm.

Seeing as the plugs are a little dark and its gulping fuel, i think i would still look at both carbs working 'all' the time rather than slide carb first then the cv.

A thing I sometimes do, the older the bike the more i do it, is run the bike then tap the carb bowls and see if the engine note changes, misfires, or revs. then take it upto 3000rpm and try again. it may give you an indication that things may be stuck/worn.

However either way, your going to have to pull them in the end.

There are pdf files of the xt all over the web so you should be able to get one for the carbs.

Good luck and get back when you have more info, photos or carbs out.

I have a pair in a box i think, will go have a look over them and see if i can give any pointers.

Do you have a fuel pump on your xt?

Tom
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  #2  
Old 29 Jun 2010
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No fuel pump on my bike. the CV carb though, I have to get a pictue, bt the pressed in jet, looks like someone did make an attempt to enlarge it for some unknown reason. I'm probably gonna need a whole new CV carb honestly, but I'm not certain yet.

I've been through the carbs before, and not noticed anything dirty, or out of place/spec, but at the time, I hadnt looked at float height, as I have no tool to measure that.
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Old 1 Jul 2010
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ok, I pulled the carbs off, the jet on the right side sure does look like some less than smart hick decided to "rejet" the thing his way.

Does anyone have another one of these jets I could snag up for cheap? it sure looks like this one is FUBAR.



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