hey if i move the high and slow nobs leaner or richer with little or no change to the engine while moving, are they stuck and not working or do they not have that much effect on the engine? thanks.
You may just be spinning the knob on the shaft. If the packing nut is too tight, the needle valve will not actually move. The knobs for the era OMC motor were/are notorious for wearing and slipping on the shaft.
