The DuroMax XP20HP is our largest and most powerful single cylinder engine we offer; this 500cc 4-stroke OHV powerhouse is suitable for multiple heavy-duty applications including go karts, pressure washers, trailer mounted-mobile carwashes, log splitters, roto tillers- cultivators, and water/trash transfer pumps. This engine is equipped with convenient features like a large 1.35-gallon gas tank for longer runtimes, an E-Z pull recoil starter to start the engine with ease, and EPA and CARB approved for safe mandated use.


  • 500cc 4-Stroke OHV engine
  • Large 1.35-gallon fuel tank
  • Runs on standard 87 Octane gasoline
  • E-Z pull recoil starter
  • Air Cleaner: Dual, semi-dry, oil bath
  • EPA and CARB approved for safe mandated use
  • Applications: Go Karts, Pressure Washers, Trailer Mounted - Mobile Carwashes, Log Splitters, RotoTillers - Cultivators, Water/Trash Transfer Pump

  • DuroMax XP20HP Engine
  • Spark Plug Wrench
  • Oil Funnel
  • Owner's Manual
  • 3-Year Limited Factory Warranty
  • 30 Day Satisfaction Guaranteed
Manufacturer DuroMax Power Equipment
Part # XP20HP
Engine Type 4-Stroke
Valve Type OHV
Engine Cooling Type Forced Air
Displacement 500 cc
Bore 94 mm
Stroke 72 mm
Max Output 4000 rpm
Max Torque 22.87 Ft/lbs (31 N·m) @ 2500 rpm
Shaft Orientation Horizontal
Shaft Size 1” diameter, 3.535” long, 1/4” keyway
Shaft End 3/8” size 24 UNF – 2B drilled and tapped
Shaft Rotation Counter-Clockwise
Measurement from Center of Shaft to Base 5.26”
Fuel Tank Capacity 1.35 gallons
Fuel Types Gasoline
Fuel Delivery System Carburetor
Average runtime on gasoline 2 hours
Starting type Recoil Start
Recoil Start Yes
Cast Iron Sleeve Yes
Bearing Type Stainless Steel Ball Bearing
Oil Cooling Type Splash
Oil Capacity 40.5 fluid oz.
Recommended Oil 10W-30
Recommended Oil Types Blended, Conventional, or Synthetic
Product Dimensions 19” L x 17” W x 19” H
Weight 77 lbs
UPC 811640016869
EPA Certified Yes
CARB Certified Yes
50 State Emissions Yes

 

Order shipment preparation takes 3 days. Once shipped orders usually take 2 weeks to be delivered. These are estimations; delivery can be delayed for reasons beyond our control. You can always contact us to know the exact delivery time once you placed an order with us. Have a look at our shipping policy here.