Turn both of them in all the way then back them out one turn. This should let you start it. Then turn the high air screw clockwise until it begins to stall, then turn it counter-clockwise until it begins to stall. Then turn it somewhere in between the two where it sounds smooth. Same with the low.
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Turn both of them in all the way then back them out one turn. This should let you start it. Then turn the high air screw clockwise until it begins to stall, then turn it counter-clockwise until it begins to stall. Then turn it somewhere in between the two where it sounds smooth. Same with the low.