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Mcculoch mt 300mcculoch petrol strimmer carb two adjustable screw bolts ones for petrol, ones petrol & air mixture hich one does which

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Actually both screws are for petrol mix. The screw closest to the engine is the Lo side. Lo side jet provides petrol at idle and during the ramp up to speed. Hi side jet (closest to air filter) only effects the mix at high speed.
From McCulloch, these were set at 1 1/4 turns out.
Good luck!

Posted on Sep 16, 2010

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