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Here's a quick and (you'd think) obvious tip: Always check the butterflies in the carb's base plate to make sure they open completely. The butterfly shaft on the left is not quite open all the way. This is mostly a linkage problem and can be solved with a slight amount of tweaking. Also, for this application it will be necessary to change the 750-cfm baseplate to an 850-cfm baseplate. This will allow a greater amount of fuel and air to be drawn through the blower.