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Carburetor adjustment on McCulloch Mini-Mac 30

Which way does one turn the idle adjustment and high speed adjustment needles to increase or decease speed/power? The manual does not say.

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Turning Hi & Lo mixture screws in leans the mixture,out rich-ens it.turn the T screw in to increase idle speed the chain should slowly come to a stop at idle [chain brake off] adjust Low needle first until it accelerates smoothly then Hi needle for best 'revs'.then Lo again if necessary if you don't know where they were set before,start w/ screws 3/4 to 1 turn out from a lightly seated position

Posted on Sep 23, 2009

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You got it almost right. The screws go in to lean and out to richen. Idle will be in to increase and out to lower.
Always adjust the high speed needle first. Slowly lean till you hit top rpm then back off 1/8th turn.
Low speed needle, slowly lean till the engine stops burbling on exceleration. If you go too far the engine will stop quickly when the throttle is advanced. Back it off a little and try it again.
Back to the high speed needle, adjust again.
NOW adjust the idle screw.
Time to adjust the needles again.
This procedure may need to be repeated as the engine breaks in. Most small industrial engines need a minimum of 5 gals through the engine to break in.

Posted on Feb 12, 2010

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Hi Christi:
This is a "standard approach" that i've used for various small engines for a long time. It may not be factory specs, but it's worked for me.
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This is your carb:
http://c.searspartsdirect.com/lis_png/PLDM/00051166-00002.png

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