The new outboards share a 127 cc (7.75-cubic-inch) single-cylinder, overhead-valve powerhead. The BF4 has a 4,500 to 5,500 rpm WOT range, while the BF5 and BF6 make more power thanks, in part, to an rpm range between 5,000 and 6,000. The BF5 has a restrictor behind the carb to limit its power. The new powerhead features an automatic decompression mechanism that let me pull the starter cord with just two fingers. Another update is an ECU that will reduce rpm to 2,300 in the event oil pressure is low, protecting the engine while giving the operator some get-home thrust. There’s also a bright-red, low-oil-pressure warning light on the front of the motor. The new motors also cease running instantly when the stop button on the front of the engine is depressed. The previous design required the operator to hold the button down until the engine died. The charging power of the optional dealer-installed alternator has been increased from 3 amps to 6 amps. There are also three accessory props offered for the new motors.