You may have a fuel screw adjustment needed. Fuel screw is on primary carb, right at front of carb underneath. Take a short screwdriver, turn in clockwise counting turns and part turns. DO NOT TIGHTEN, just until it seats, then turn back about 1.5 turns. This is a starting place. With a fuel screw, when you turn it out, you are richening the mixture.
With engine warm and idling properly, adjust fuel screw in or out for highest rpm. This will be the leanest setting for your altitude. Remember your initial fuel screw setting so you can return it there if needed. I have seen an increase of several hundred RPM's. Reset idle speed to normal after setting fuel screw.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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