The Honda BF15 and BF20 pack impressive performance into a compact package, weighing just 104 pounds — among the lightest in their class. A large 21.4-cubic-inch displacement and long-stroke design deliver strong torque across the RPM range, while 3-stage carburetion improves fuel economy and smoothness over conventional 2-circuit designs. Features like shallow water drive, available power tilt, and a class-leading charging system (12 amps at 3000 RPM) round out the performance side, keeping electronics powered even at trolling speeds.

Starting and everyday use are simplified too: a decompression release and digital CDI system cut hand-pull starting effort by 40%, while Auto Start Enrichment automatically adjusts the air/fuel mixture for quick warm-ups. An integrated, balance-point carrying handle and lightweight design (the lightest four-stroke in its class) make transport and mounting easy, and Honda’s pendulum mount system smooths out vibration for a comfortable ride. Front-mounted tiller controls, a longer composite handle, and adjustable steering friction give precise, fatigue-reducing control.

On reliability, the BF15 and BF20 come with Honda’s transferable, non-declining True 5 Warranty, an engine alert system that guards against low oil, overheating, and over-revving, and Honda’s multi-layered corrosion protection system to keep the engine looking and performing like new.

EngineBF15BF20
Type4-Stroke SOHC 2 Cylinder/4 Valves4-Stroke SOHC 2 Cylinder/4 Valves
Displacement350 cc (21.4 cubic inches)350 cc (21.5 cubic inches)
Bore & Stroke59 mm x 64 mm (2.3 x 2.5 inches)59 mm x 64 mm (2.3 x 2.5 inches)
Full Throttle RPM Range4,500-5,500 RPM5,000-6,000 RPM
Rated Power15 HP @ 5,000 RPM20 HP @ 5,500 RPM
Cooling SystemWater CooledWater Cooled
Fuel Delivery1 Carburetor1 Carburetor
Ignition SystemPGM-IGPGM-IG
Starting SystemElectric/RecoilElectric/Recoil
ExhaustThrough HubThrough Hub
LubricationWet SumpWet Sump
Trim Range4 Stage 8°-12°-16°-20°4 Stage 8°-12°-16°-20°
Tilt Range72°72°
DriveBF15BF20
Gear Ratio2.08:12.08:1
Gear ShiftF-N-RF-N-R
EquipmentBF15BF20
Alternator with voltage regulator (Electric Start)12-Amp (148 watt)12-Amp (151 watt)
Alternator with voltage regulator (Manual Start)6-Amp (76 watt)6-Amp (76 watt)
Propeller4-Blade Aluminum4-Blade Aluminum
Diameter x Pitch, Standard9¼ x 10 inches9¼ x 10 inches
Diameter x Pitch, Power Thrust10 x 7? inches10 x 7? inches
Power TiltAvailableAvailable
Oil Pressure AlertStandardStandard
Temperature AlertStandardStandard
Rev-LimiterStandardStandard
WarrantyBF15BF20
Recreational5 years5 years
Commercial/Rental2 years2 years
Optional ExtendedUp to 36 months Up to 36 months 
DimensionsBF15BF20
Overall Width350 mm/13.8 inches350 mm/13.8 inches
Transom HeightBF15BF20
S Type381 mm/15 inches381 mm/15 inches
L Type508 mm/20 inches508 mm/20 inches
X Type635 mm/25 inchesNA
Dry WeightBF15BF20
S-Type47 kg/104 lbs.47 kg/104 lbs.
L-Type50 kg/110 lbs.50 kg/110 lbs.
X-Type52 kg/115 lbs.NA