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Product / Pressure Washers / 85.578.150

Powerease R420-18A Electric Start Engine – 420cc, 12.6 HP, 1" Horizontal Shaft

Powerease R420-18A Electric Start Engine – 420cc, 12.6 HP, 1" Horizontal Shaft

Specifications

ENGINE

Powerease R420-18A

CC

420CC

ENGINE START

Recoil / Electric

Horse Power

15 HP / 17.8 FT/LB

Bore X Stroke

88 mm x 64 mm

Net Power Output

12.6 HP (9.4 KW) @ 3,600 RPM

Net Torque

17.8 LB-FT (24 NM) @ 2,500 RPM

Shaft Rotation

Counterclockwise

Shaft Orientation

Horizontal

Lubrication System

Splash

Carburetor

Horizontal Type Butterfly Valve

AMP Charge

18

Compression Ratio

8.2:1

Ignition System

Transistorized Magneto

Starting System

Recoil / Electric

Oil Capacity

1.1 L (1.16 U.S. QTS)

Shaft Size

1" Keyed

Weight

70 lbs

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PRODUCT

DESCRIPTION

Big Power, Easy Starts, Built to Last

The Powerease R420-18A Electric Start Engine combines the proven reliability of the Powerease 420cc OHV platform with the added convenience of an electric key start system. With 12.6 HP and an 18-amp charging system, this engine is built for heavy-duty use where power and ease of use matter. From professional grade pressure washers and generators to air compressors, pumps and construction equipment, the R420-18A has the torque, longevity and convenience to keep your equipment running strong.

For over 10 years, BE Power Equipment has used Powerease engines to power equipment across industries. Known for durability, field serviceability and consistent output, Powerease engines like the R420-18A have earned the trust of professionals and homeowners.

Features

  • Model: R420-18A

  • Engine Type: Air Cooled, 4 Stroke OHV

  • Displacement: 420cc

  • Net Power Output: 12.6 HP (9.4 kW) @ 3,600 RPM

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

  • Starting System: Recoil / Electric with key system

  • Ignition System: Transistorized Magneto

  • Compression Ratio: 8.2:1

  • Amp Charge: 18 amps

  • Fuel Tank Capacity: 6.7 L (1.77 gal)

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

  • Carburetor: Horizontal type butterfly valve

  • Lubrication System: Splash

  • Oil Capacity: 1.1 L (1.16 US qts)

  • Low Oil Shutdown: Yes, automatic safety feature

  • Shaft Size: 1" keyed, horizontal orientation

  • Key Way Size: 1/4" x 2.2"

  • Shaft Rotation: Counterclockwise

  • Air Cleaner: Dual-element for advanced filtration

  • Dry Weight: 70 lbs

Electric Start

The R420-18A has an electric key start system with wiring harness, starter motor and solenoid pre-installed so you can start the engine with the simple turn of a key. No more strain and effort of multiple recoil pulls, perfect for larger equipment where quick and reliable starts are critical.

The recoil backup gives you the flexibility of two starting options. With a transistorized magneto ignition for consistent spark, the R420-18A makes starting second nature.

Heavy Duty Performance

12.6 HP at 3,600 RPM and 17.8 lb-ft of torque at 2,500 RPM means the R420-18A is built for heavy duty use. The air-cooled, OHV design is more efficient and reduces heat buildup compared to side-valve designs, extending engine life and fuel economy.

The 1” keyed horizontal shaft makes it a direct replacement for equipment that requires a standard 1” mount, so it’s compatible with pressure washers, pumps, compressors and generators. Its rugged build and high displacement means consistent output even in tough environments.

Safety and Maintenance

The R420-18A has an automatic low-oil shutdown system to prevent damage in the event of low oil levels. This built-in safety feature protects your investment and extends service life.

Maintenance is easy and accessible with field serviceable components. The spark plug, air filter and carburetor are all designed for easy reach so minimal downtime when service is required. The dual-element air cleaner provides superior dust and debris filtration, especially important in harsh environments like construction sites or agricultural fields.

Fuel and Oil

For best results use regular unleaded 86 octane or higher. Ethanol-free fuel is recommended for maximum life, but ethanol blends up to 15% are acceptable.

The engine requires 1.1 L (1.16 US qts) of oil. The splash system ensures proper lubrication and regular oil checks are recommended to maintain peak performance.

Applications

The Powerease R420-18A is a versatile engine for a wide range of equipment:* Pressure Washers – Industrial grade cleaning machines that need torque and easy starts.

  • Generators – Provides consistent power for job sites or home backup.

  • Water Pumps – Irrigation, flood control, construction site dewatering.

  • Air Compressors – Workshop and field compressed air needs.

  • Lawn & Garden Equipment – Larger equipment like tillers or heavy duty mowers.

  • Construction Equipment – Compactors, small machinery and other tools that need high torque.

Product Details

  • Model: Powerease R420-18A Electric Start

  • 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

  • Fuel Tank Capacity: 6.7 L (1.77 gal)

  • Oil Capacity: 1.1 L (1.16 US qts)

  • Air Cleaner: Dual-element

  • Dry Weight: 70 lbs

  • Package Weight: 77 lbs

  • Unit Dimensions (LxWxH): 17" x 18" x 18"

  • Shipping Dimensions (LxWxH): 21" x 17" x 20"

The product may vary from the images on the website.

Professional Grade

Powerease engines have been a trusted choice for BE Power Equipment for over 10 years. The R420-18A Electric Start Engine continues this tradition, with easy starts, dependable power and field serviceable design. With electric key start, high torque and user friendly maintenance features this engine is built to keep professional and homeowner equipment running strong.

When you need power and convenience the Powerease R420-18A is ready.

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Frequently Asked Questions about Pressure Washers

How to store a pressure washer?

To ensure the durability of your heavy duty pressure washer:

  • Empty the gas tank to prevent fuel from degrading or clogging the engine.
  • Empty the pump and hoses of any remaining water.
  • Perform necessary maintenance before storage.
  • Store in a dry area.
  • Cover.

What is a pressure washer?

A power washer is a cleaning machine that uses a gasoline engine to power a high pressure water pump and nozzle. It’s used to clean driveways, decks, vehicles, outdoor furniture and more by spraying water at high PSI to remove dirt, grime, mold and other debris.Many models also come with a detergent tank for added cleaning power.

How does a power washer work?

A power washer works by drawing water from a connected hose and pumping it through a high pressure nozzle. The gas engine powers the pump which pressurizes the water and then expels it through the nozzle at high speed to clean the surface. The water pressure is measured in PSI (pounds per square inch) and the flow rate is measured in GPM (gallons per minute).Many models also feature adjustable water pressure settings to cater to different cleaning needs. BE makes pressure washing easy with models available for light jobs and heavy duty commercial cleaning projects.

Gas vs Electric power washers?

The main difference is that a gas pressure washer, known for its cleaning power, is powered by a gasoline engine, making it more powerful and portable, while an electric pressure washer is powered by electricity and is generally quieter and lighter.

Gas pressure washers are for heavy duty and large areas due to their durability, whereas electric pressure washers are for smaller jobs.

Your BE electric pressure washer is perfect for smaller jobs and built for portability, and we offer a wide range of electric models. Included with our electric models is a long extension cord for use anywhere around your house.

What to consider?

When choosing a gas pressure washer consider:

  • Pressure (PSI): More PSI means more cleaning power but also more potential for damaging delicate surfaces.
  • Flow Rate (GPM): More GPM means faster cleaning as more water is dispensed.
  • Engine Power: Bigger engines mean more durability and power.
  • Portability: Weight, handle design and wheel size for easier to move.
  • Nozzles: Multiple spray nozzles to adjust the spray pattern for different tasks.
  • Adjustable Nozzle: Allows for fine-tuning the spray intensity and pattern for various cleaning needs.

How much pressure do I need for?

The required pressure (PSI) and cleaning power depend on the surface you’re cleaning:

  • Light duty (car washing, outdoor furniture): 1,300-1,800 PSI.
  • Medium duty (patios, fences, decks): 2,000-3,000 PSI.
  • Heavy duty (driveways, brick walls, large equipment): 3,000+ PSI.

Many pressure washers come with adjustable pressure settings to handle different cleaning tasks effectively.

Can a pressure washing damage surfaces?

Yes, a power washer can damage surfaces if used incorrectly. High pressure water can strip paint, dent soft surfaces or even cause structural damage if the pressure is too high or the nozzle is held too close to the surface. Always use the right PSI for the material you’re cleaning and keep a safe distance from delicate surfaces.

To prevent damage, consider using a model with adjustable pressure settings.

How to maintain your pressure washer?

To ensure the durability and smooth operation of a pressure washer:

  • Change the oil as per manufacturer’s instructions.
  • Clean or replace the air filter to ensure good airflow.
  • Inspect and clean the nozzle regularly to prevent clogs.
  • Drain the gas tank if you’re storing the washer for a long time.
  • Check the hoses for leaks or damage and replace them if needed.
  • Follow regular maintenance requirements to keep the washer in optimal condition.

Can I use a pressure washer in cold weather and low water temperature?

You can use a pressure washer in cold weather but it’s more difficult. The water flow rate in the hoses and pump can freeze and damage the equipment. If you plan to use your pressure washer in cold temperatures make sure to winterize it and store it in a warm area when not in use. You can also use anti-freeze solutions for pressure washers.

Some models are designed to use hot water, which can be particularly effective for cleaning in cold weather.

Do I need any accessories?

Common accessories for power washers: