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HI JERRY
HOW IS THE FLOW DOWN FROM THE TANK OR FUEL FILTER
MAY NEED TO CHANGE FUEL FILTER OR CHANGE FUEL LINES OR TANK VALVE BECAUSE USING FULL CHOKE SUCKS THE FUEL AS HARD AS THE BIKE CAN TO GET FUEL THROUGH THE SMALL LINES LET ME KNOW WHAT YOU FIND OR DON'T FIND
A horrible agony to die that way.
Seems you have a back pressure coming out the wrong way, check your valves opening and closing performance and its timing perhaps it will revive it back again.
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.
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