I have a spare K&B sport 40 setting I'll never use it, just looked its NIB with a muffler. It has a carb throttle and a exhaust throttle.-guess that never took off over kill .I can add it to the for sale section if interested. Just to point out a K&B SPORT 40 is a sport engine not a racing engine.They run all day long. Nice looking Dumas hull, must of had a set of wings in them rear slots.