The 4 HP Honda Engine with gear reducer provides the power you need while offering an effective and reliable performance. The built-in 6:1 gear reducer and recoil start are designed to make it even more efficient. Common applications include pumping, operating pressure washers, and tillers or cultivators. The 4 HP Honda Engine offers a versatile array of ways it can be used.

4.0 hp gas engine with built in 6:1 gear reduction. Honda's GX series engines are legendary for superior reliability and performance. And there's no doubt about it: the GX120 lives up to the legend. Lower noise levels, lower vibration, and lower emissions without sacrificing power output or performance. 

FUEL EFFICIENT, HIGH OUTPUT OPERATION: 
-Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency 
-OHV design for increased efficiency and optimal power transfer 
-High compression ratio for better fuel efficiency SMOOTH PERFORMANCE: 
-Precision engineered components result in lower vibration 
-Ball bearing supported crankshaft for greater stability 
EXCEPTIONALLY QUIET: 
-Even quieter than previous model! 
-Large capacity, multi-chamber exhaust system 
-Reduced mechanical noise due to light weight, noise-reducing materials 
-Forged steel crankshaft and rigid crankcase 
-Helical cut gears 
-Sophisticated air intake system 
PROVEN RELIABILITY: 
-Oil Alert 
-New carburetor chamber coating and carburetor filter help to protect against fuel impurities 
-Cast iron cylinder sleeve 
-High quality materials, fit, and finish 
-Dual element air cleaner 
-Fuel Valve
EASY TO USE AND MAINTAIN: 
-Simple throttle control 
-Large fuel tanks and automotive type fuel cap 
-Dual oil drains and fill 
-Easily accessible spark plug 
EASY STARTING: 
-Heavy duty recoil starter 
-Ergonomic, easy to grip recoil rope design 
-Automatic mechanical de-compression system EMISSIONS COMPLIANT: 
-Lower emissions, same power output! 
-CARB and EPA certified 
-No catalyst necessary

• Engine type: Air-cooled 4-stroke OHV
• Starting sytem: Recoil starter
• Shaft: 3/4" solid keyed
• Built in 6:1 gear reduction
• Bore x stroke: 60 x 42 mm
• Displacement: 118 cm3
• Net power output: 3.5 HP (2.6 kW) @ 3600 rpm
• Net torque: 5.4 lb-ft (7.3 Nm) @ 2500 rpm
• PTO shaft rotation: Counterclockwise from PTO shaft side
• Compression ratio: 8.5 : 1
• Lamp/Charge coil options: 25W, 50W
• Carburetor: Butterfly
• Ignition system: Transistorized magneto
• Lubrication system: Splash
• Governor system: Mechanical
• Air cleaner: Dual element
• Oil capacity: 0.59 US qt. (0.56 L)
• Fuel tank capacity: 2.1 US qts (2.0 liters)
• Fuel: Unleaded 86 octane or higher
• Dry weight: 29 lbs (13.0 kg)
• Dimensions: 11.7 in long x 13.6 in wide x 13.0 in high (297 x 346 x 329 mm)
• Warranty: 3 year commercial warranty (limited to manufacturer defects)