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
There should be a gasket under the cap on the primary carb to stop air leaks , The seal on the throttle shaft do go bad so it is quite possible they're leaking .
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 , http://www.partzilla.com/parts/detai...286-00-00.html
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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