I would pull the carb and check the condition of the reeds. While the carb is off give it a SUPER good cleaning, make note of all the jets and settings and check the float height level very closely and probably install a new float needle while your in there. If the float level is wrong the bike can run like crap. Same with the reeds.
Another poster suggested to check the water pump impeller. Do this as it sounds like the bike might be overheating. An impeller thats blown away wont get the fluid moving and cause the overheating and spewing anti freeze.
What kind of oil are you using. Some just smoke like crazy (Golden Spectro for example)
Check the condition of the packing material in you silencer and repack anyway. Badly saturated packing and clogged holes in the perforated tube can also cause problems.
Take a magnifying glass or something to check the needle for markings. Any real Keihin needle will be marked. If there are rerally no marks it must be an LTR needle I guess (RB-Designs?)
You may have a wet side crank seal that's bad and you'll just be chasing your tail until that's resolved. Check the other stuff first though, all pretty easy to do.
Skidad
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