A stock 30 carb will draw in more air/fuel mixture than a stock 26. Putting a stock 30 carb on a stock 10 horsepower motor will hurt the performace more than help it.
A 14 horsepower Kohler with a small exhaust valve may get by with a 26 carb. A 14 horsepower Kohler with a big exhaust valve will not in the long run. The motor could be on the lean side. Motor that are on the lean side will run hotter and burn a piston, valve, head or a combonation of all 3.
One can make a 26 carb flow more air/fuel flow better than a stock 30 carb. It will take serious mods to the carb and motor to do that.
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