Powerease R420 Engine – 420cc, 12.6 HP, 1" Horizontal Shaft

Part Number: 85.570.150
Category: Small Engines
Type: Powerease R420 Engine – 420cc, 12.6 HP, 1" Horizontal Shaft

The Powerease R420 Engine is a heavy-duty, air-cooled 420cc OHV gas engine designed for demanding commercial and industrial applications. Delivering 12.6 HP at 3,600 RPM and 17.8 lb-ft of torque, the R420 provides reliable, continuous power for equipment that operates under sustained load.

Featuring a 1" keyed horizontal shaft, recoil start, and automatic low-oil shutdown, this engine is an ideal replacement or power source for pressure washers, water pumps, air compressors, and construction equipment. Its efficient OHV design runs cooler and cleaner, improving fuel economy and extending service life.

Key Features

• 420cc air-cooled, 4-stroke OHV engine

• Net power output: 12.6 HP (9.4 kW) @ 3,600 RPM

• Net torque: 17.8 lb-ft (24 Nm) @ 2,500 RPM

• 1" keyed horizontal shaft (counterclockwise rotation)

• Recoil start with transistorized magneto ignition

• Dual-element air cleaner for dusty environments

• Automatic low-oil shutdown for engine protection

• Splash lubrication system

• Built for continuous-duty operation

Engine Specifications

• Model: Powerease R420

• Displacement: 420cc

• Bore x Stroke: 88 mm x 64 mm

• Compression Ratio: 8.2:1

• Net Power Output: 12.6 HP @ 3,600 RPM

• Net Torque: 17.8 lb-ft @ 2,500 RPM

• Starting System: Recoil

• Ignition System: Transistorized Magneto

• Carburetor: Horizontal type butterfly valve

• Lubrication System: Splash

• Low Oil Shutdown: Yes

• Fuel Type: Regular unleaded 86 octane or higher (ethanol blends up to 15% acceptable)

• Fuel Tank Capacity: 6.7 L (1.77 gal)

• Oil Capacity: 1.1 L (1.16 US qts)

Shaft Specifications

• Shaft Orientation: Horizontal

• Shaft Rotation: Counterclockwise

• Shaft Size: 1" keyed

• Keyway Size: 1/4" x 2.2"

Dimensions & Weight

• Dry Weight: 68 lbs

• Shipping Weight: 77 lbs

• Unit Dimensions (L x W x H): 17" x 18" x 18"

• Shipping Dimensions (L x W x H): 20" x 17" x 20"

The Powerease R420 is engineered for machines that require dependable torque and long run times. Its air-cooled OHV design improves thermal efficiency while reducing fuel consumption and wear, making it well-suited for professional equipment used daily in the field.

The 1" keyed shaft allows compatibility with a wide range of existing equipment, making this engine an excellent option for both new builds and engine replacements.

Field-Serviceable Design

The R420 is designed with accessibility in mind. Service components such as the air filter, carburetor, and spark plug are easy to reach, reducing downtime during routine maintenance. The dual-element air filtration system enhances protection in dusty job-site conditions.

Typical Applications

• Pressure washers

• Water pumps and dewatering systems

• Air compressors

• Lawn and garden equipment

• Construction and job-site machinery

• Industrial equipment requiring continuous power