Further explanation of emulsion tube. That is the brass fitting the main jet is screwed into. Just unscrew if from the carb housing. You will notice a row of holes on each side of it. Clean carefully with a needle or pin taking care to NOT making the hole larger. I just push a pin thru and look at the pin for any crud, wipe it off and try again. Lastly I put the pin thru and spin the tube on the pin like an axle. Make sure the bore of the tube is clean, pipe cleaner or something soft will do it.
Clean other jets but take care to NOT make any jet hole larger by forcing something through it. There are rubber o-rings in various places, check their integrity and replace if in doubt. Yes boots can get hard and leak, there are o-rings under the flange where it bolts to the head. A little Yamabond #4 or similar non hardening sealer works wonders there. Same if you have a seeping gas valve on your tank. Put a bit of Yamabond #4 on the o-ring and the surface of the tank and no leak.... Yamabond should air dry for a couple minutes before mating the surfaces. Put a bit on both sides of the surfaces.
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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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