That is why my Gravely commercial C-10A machine I use to snow blow got the juice. Put 100 AV gas in it from the local airport. Good thing about the "K" series KOHLER engines is you can really adjust the carbs all over the place. Had to turn the air mix screw in about 1 / 2turn. The main jet needed almost a full turn in. Now in really cold weather she pops right off. Also put a synthetic blend oil in so the engine can roll over really free. The faster the better.