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1979 IT175 Assuming the carb is cleaned properly, adjustments can be made at the pilot air screw for idle mixture adjustments simply by turning the screw to adjust air/fuel ratio. (stock 1 1/4 turns out from bottomed). For mid-range air/fuel ratio adjustments, you can change the clip position at the main needle (stock clip at #4 - fourth groove from the short side). For 3/4 to wide open air/fuel ratio adjustments, change the main jet for something larger or smaller (stock #360). These settings come from the 1979 IT175 owner's manual.

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14y ago

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