What I do know is that my factory carb was constantly full of mostly fine sediment from the rusty fuel tank(before I replaced fuel tank, fuel lines, fuel pump, and fuel filters).. that's why I sent it out in the first place.. to get it back and bolt it on with an utterly clean fuel system behind it.. and my guess now is that the rebuilder did not properly clean/blow out everything, .. causing remaining trapped rust sediment to move to and fro, blocking fuel from flowing and causing lean out fuckery. Scott at HARMS also brought this up and claims sometimes it takes a couple of attempts to douche out completely.
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