The engine can run away if you turn the main fuel screw on the pump in too far, which is why you do it with the intake open so you can snuff the engine out in case it starts to rev up. If you turn it in by small incriments, it will start to "hang" a bit when you rev it so you know its getting close, and back the fuel screw out a little bit. Then the pump is turned up as far as it can go. Read up on the procedure in the performance section if you haven't. Its well worth it!
Jason
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