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In California the new blowers have sealed mixture adjustments and you need the have your carb. mixture adjusted be a qualified shop. If your carb. HAS mixture adj., turn the high speed mixture so it runs best at high speed, then turn another 1/8 turn counter clockwise to be a little rich. Then at idle adj. the other screw till it idles best.
Sounds like an over fueling issue, Try resetting the carb to its standard settings, screw both tuning screws right in ant then turn anticlockwise to the following settings H 3/4 of a turn. L 1 full turn. This should set it back to standard. If this doesn't help then it could be a carb diaphram or sticking needle.
sounds like fuel delivery, check ur fuel pump first....grab a cup pull the hose that connects to the carb and the tank should be (red) turn the bike on dont start just turn the key on, it should pump fuel(a pretty good flow) if its pumping carbs are possibly dirty, if its not replace it, is ur battery fully charged, and all post secure?
It sounds like it is running too rich (too much fuel). First, make sure the air filter is clean and that there are no intake leaks between the carburetor and the engine. Also, try a new spark plug (they can go bad without warning). Then, with the engine at normal operating temperature and idling, adjust the idle mixture screw to attain the highest idle speed. After this, set the idle to the correct speed using the idle speed adjustment screw.
Test ride. If it still spits and sputters at half to full throttle, then you will need to get a smaller main jet - or go to a less restrictive air filter, such as one by K&N.
Finally, I am not sure what prompted you to put a carburetor kit in, but if the bike had been sitting for any lenght of time (more than 6 months) make sure the carb isn't plugged up.
If it is old enough to have points then I would check them and make shure they are clean and gapped at .020. if that is noth the problem then it sounds like a fuel issue. Either a weak pump or a dirty carb.