Old 07-02-2015, 06:58 PM
  #4  
jester_s1
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Air bubbles before the needle valve is a tank or fuel lines problem. Replumb the tank and be gentle when you reinstall the tank. Also replace the fuel line between the needle valve and the carb. Bubbles after the needle valve indicate bad o rings in the needle valve usually. As you've seen, no amount of tuning will make an engine reliable when it doesn't have a reliable fuel supply.
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