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Originally Posted by jjrider
If it's truly an 1/8" up/down that too much . You should check that all the parts are there above the needle to hold it down . It should have a little movement(maybe .015-.02"IIRC) but no 1/8" from what I remember with mine, has been a while since I had any of mine apart and am used to FCR's lately .
Here's the parts that you need . Yamaha Motorcycle Parts 1987 XT600T CARBURETOR Diagram
If your secondary carb is clean inside and the bore smooth with no corrosion pitting you likely have a weak spring for the slide . You can use springs from modern Mikuni CV carb but it is tough to know which spring rate to use , trial and error . I'd try this one , 1VJ-14286-00-00 SPRING $9.69
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That's the diagram I used to order the other parts (through Boats.net). There are a few that I wanted to order that are now obsolete, including the Jet Needle Assembly. Which I also can't find any photos of as to see what I'm actually missing. Heres a picture of what my carb has, I believe I'm missing a second poly washer and maybe a small spring? I can't find photo's of one anywhere. I also wanted to replace the choke assembly as it doesn't seem theres an gasket or o-ring so maybe the shaft is worn out and leaking air. I've tried calling my dealer to try an order both 49N-1490J-10-00 and 5Y1-1410A-00-00 and they can't find anything. The parts cannot be crossed referenced. Ugh..
The secondary slide moves freely up and down and does return to the top. The spring on the shaft snaps back nicely. The only thing I noticed was the butterfly valve, when at WOT is not horizontal. It goes past that position, so maybe I can align this once the carb is back together. Any idea how to do this? I know there's an adjustment screw but I believe that is for setting when the secondary turns on.
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