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Powerhorse OHV Horizontal Engine — 420cc, 12.5 HP, 1in. x 32 31/64in.

Item# 750122
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Powerhorse OHV Horizontal Engine — 420cc, 12.5 HP, 1in. x 32 31/64in.

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Only $369.99
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  •  Cast iron cylinder sleeve reduces bore wear to extend engine life and reduces emissions and oil consumption
  • Dual ball bearings reduce friction for prolonged life
  • Forged-steel crankshaft for superior strength in high PTO torque situations
  • Recoil start with compression release helps you start on the first pull
  • Low oil shutdown turns the engine off if it runs low on oil, preventing serious damage or failure
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Product Summary

This Powerhorse® OHV Horizontal Engine is an easy-to-install solution for small engine needs. With 420cc, 12.5 HP and 18 ft.-lbs. of torque, this 1000-hour engine provides enough power to run a wide range of equipment, including log splitters and pressure washers. Its patented design incorporates an industrial-strength cast iron cylinder sleeve, dual ball bearing forged-steel crankshafts and an internal oil splash enhancement system. Low oil shutdown turns the engine off if it runs low on oil, preventing serious damage or failure. The recoil start has a compression release that helps you get running on the first pull. Combine these features with thorough U.S.-based testing, dedicated customer/tech support and incredible value, and you'll own one of the most reliable engines in the industry.

What's Included
  •  (1) Engine

Features + Benefits

  •  Cast iron cylinder sleeve reduces bore wear to extend engine life and reduces emissions and oil consumption
  • Dual ball bearings reduce friction for prolonged life
  • Forged-steel crankshaft for superior strength in high PTO torque situations
  • Recoil start with compression release helps you start on the first pull
  • Low oil shutdown turns the engine off if it runs low on oil, preventing serious damage or failure
  • Internal oil splash enhancement and delivery system delivers extra lubrication
  • Sound pressure balanced muffler
  •  Heavy-duty metal fuel tank with baffles to reduce spalshing
  • Air ports limit debris entry
  • Pleated paper filter and foam pre-cleaner protect engine from harmful debris
Key Specs
Item# 750122
Brand Powerhorse
Manufacturer's Warranty 2 year Limited Warranty
Ship Weight 80.0 lbs
Displacement (cc) 420
HP 12.5
Application Pressure washer, lawn mower, wood splitting machine
Shaft Output 8.6/3,600
Engine Type OHV
Start Type Electric start
Shaft Dimensions Diameter x L (in.) 1 x 3.484
Mounting Base L x W (in.) 7.697 x 3.74
Bolt Circle (in.) 1 3/16
Shaft Keyway (in.) 0.248 x 0.236 x 2.2
Max. RPM 9.0 kW at 3,600
Charging System Amps 0.5
Ignition System CDI
Cylinders (qty.) Single
Fuel Tank Capacity (qt.) 6.8
Oil Capacity (qt.) 1.163
Air Cleaner Type Paper/foam
Muffler Included Yes
Low Oil Alert Yes
Lubrication System Splash
Shaft Rotation (From PTO Shaft Side) Counter-clockwise
Bore x Stroke (in.) 3.5433 x 2.5984
Cooling System Air cooled
Carburetor Horizontal type, butterfly valve
Governor System Mechanical centrifugal
Dimensions L x W x H (in.) 18 31/32 x 16 17/32 x 17 23/32
EPA/CARB Approval (California Air Resource Board) Yes

Warnings + Disclaimers

High Altitude Operation

CAUTION: Operating at an altitude of greater than 2000 feet (610 meters) may affect your engine's performance, fuel consumption, and emissions. To remain emissions compliant and improve engine performance at higher altitudes, a high-altitude kit is required. A high altitude kit includes a carburetor jet resized to help correct air / fuel mixture at altitude. To order a high altitude kit, or if you have additional questions, contact us at 1-866-442-2576. Please note, engines with the high-altitude kit installed operated at lower altitudes could cause severe engine damage and affect emissions compliance. When modified, a tag or decal should be added to the product stating that a high-altitude kit was installed and to remind you to re-service the carburetor (re-jet) when operating in lower altitude environments.

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Replacement Parts
Call To Order: 1-800-657-0516

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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Item# 750120
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Only $169.99
Powerhorse OHV Horizontal Engine — 420cc, 12.5 HP, 1in. x 32 31/64in. The price is $369.99.
Powerhorse OHV Horizontal Engine — 420cc, 12.5 HP, 1in. x 32 31/64in.
(Not Yet Rated - New)
Item# 750122
In Stock Online
Only $369.99
Hide Similarities
Displacement (cc)
212 420  
HP
6 12.5  
Application Pressure washer, lawn mower, wood splitting machine Pressure washer, lawn mower, wood splitting machine  
Shaft Output
3.9/3,600 8.6/3,600  
Engine Type OHV OHV  
Start Type
Recoil Electric start  
Shaft Dimensions Diameter x L (in.) 0.75 x 2.43 1 x 3.484  
Mounting Base L x W (in.)
6.378 x 3.15 7.697 x 3.74  
Bolt Circle (in.)
0.79 1 3/16  
Shaft Keyway (in.)
0.188 x 0.197 x 1.79 0.248 x 0.236 x 2.2  
Max. RPM
4.3kW at 3,600 9.0 kW at 3,600  
Charging System Amps 0.5 0.5  
Ignition System
CDI CDI  
Cylinders (qty.)
Single Single  
Fuel Tank Capacity (qt.)
3.8 6.8  
Oil Capacity (qt.)
0.63 1.163  
Air Cleaner Type
Paper/foam Paper/foam  
Muffler Included
Yes Yes  
Low Oil Alert
Yes Yes  
Lubrication System
Splash Splash  
Shaft Rotation (From PTO Shaft Side) Counter-clockwise Counter-clockwise  
Bore x Stroke (in.)
2.7559 x 2.1653 3.5433 x 2.5984  
Cooling System
Air cooled Air cooled  
Carburetor
Horizontal type, butterfly valve Horizontal type, butterfly valve  
Governor System
Mechanical centrifugal Mechanical centrifugal  
Dimensions L x W x H (in.)
14 49/64 x 12 2/5 x 13 3/8 18 31/32 x 16 17/32 x 17 23/32  
EPA/CARB Approval (California Air Resource Board)
Yes Yes