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BILT HARD 420cc 15HP Gas Engine with Electric Start, Horizontal Shaft 4 Stroke OHV Gas Motor, Gas Powered Multi-Use Engine

  • Based on 122 reviews
Condition: New
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$389.99 Why this price?

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Size: 420cc Electric Start


Features

  • POWERFUL ENGINE - Our 420cc displacement 4-stroke horizontal cylinder gas engine has a max torque of 18.45ft.lbs @2500RPM, max 3800 RPM speed, 15 maximum horsepower, 1.2 gal fuel tank. Built to meet & exceed industrial grade quality standards & provide dependable performance. The engine is shipped dry so make sure you add gasoline and engine oil correctly before starting (not included).
  • SHAFT SPECS - 1 in Diameter, 3.48 in Length, end tapped with 3/8 in.-24 UNF; Keyway 1/4 in; Mounting pattern 7.72" L x 3.39" W-4.06" W. Durable design runs quiy and provides smooth operation.This engine spark plug system can take Torch: F6TC spark plugs, with a clearance of: 0.027-0.0.31 in. The engine runs on a minimum 87+ unleaded gasoline (ETHANOL<10% recommended).
  • SAFETY & WIDELY APPLICATIONS - Built-in Force Air-Cooled and Splash Lubrication System, keeping the motor cool during extended use of time and ensure the operator's safety. A low oil shutoff functionality turns the engine off to prevent serious damage or failure. It's the perfect replacement engine for cement mixers, compressors, mowers, log splitters, vacuums, tillers, water pumps, chipper/shredders and blowers.
  • GREAT REPLACEMENT - Our 420cc 15HP Horizontal Engine is a great replacement for your Honda GX340, 389cc, GX390, 389cc, Briggs & Stratton GX340, 389cc, GX390, 389cc, Kohler CH440, 429cc, ECH440, 429cc, ECH440LE, 429cc, Yamaha MZ360, 357cc, MX360, 358cc, MX400, 402cc etc.
  • KINDLY NOTED- with EPA compliant, each gas engine will be Oil Tested before packaging, so it may touch a little oily, but 100% new condition.

Description

BILT HARD is more than a brand; it's a gateway to a new outdoor experience. Our tools are designed to deliver reliable performance and lasting durability, ensuring your outdoor time is both productive and enjoyable. From utility garden carts to versatile lawn care tools, BILT HARD provides innovative solutions crafted with high-quality materials to tackle even the most demanding tasks in any environment. Visit the Store Visit the Store Visit the Store A Great Helper for Yard Work. Visit the Store No Choke, No Primer Design, Easy to Start. Visit the Store Light and Powerful, Easy to Operate Visit the Store Eliminate the Hassle of Manual Digging. Save Your Back, No More Axe and Hammer. Visit the Store Tackle Winter with Ease. This Engine is specially designed with Electric Start. Just turn the key, you could easily get the engine start ( also with a recoil start, give you a double start secure) The Counter clockwise Rotating PTO Driveshaft is 3/8" and is support by reliable Steel Ball Bearings. the horizontal shaft is an ideal for most standard engine configurations. When the engine is cold-started, part of the air intake ports should be properly closed to increase the gasoline concentration of the mixed gas entering the cylinder.

Brand: BILT HARD


Model Name: GASOLINE ENGINE


Speed: 3800 rpm


Product Dimensions: 14.4"W x 17.5"H


Material: Cast Iron


Brand Name: BILT HARD


Model Name: GASOLINE ENGINE


Model: R420


Manufacturer: BILT HARD


Unit Count: 1 Count


Warranty Description: We guarantee this product to be free from defects in materials and workmanship 30 days from the date of purchase.


Included Components: 15HP Gas Engine Horizontal Shaft with Electric Start


Item Type Name: Gas Engine with Electric Start


Speed: 3800 rpm


Item Dimensions W x H: 14.4"W x 17.5"H


Shaft Diameter: 1 inches


Material Type: Cast Iron


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Top Amazon Reviews


  • Power to Spare....
Size: 420cc Electric Start
I pulled an old Sears Suburban SS16 could been a 18HP originally, with an Onan twin out of the weeds, been sitting around for 15 or 20 years. I needed to do some dirt work on the drive. Wasn't worth spending a $1000 on to get a twin engine, I wanted an electric start too. Looked at reviews, and didn't want o spend extra $100 to get one from the china tool store locally. So chose the 420cc Bilt Hard, drilled the holes bolted it out and started on the third pull. I still hadn't hooked the electric start up yet. Starts easily. I've got about three hours onit so far, maybe a bit more, on the third tank of gas. Wouldn't know this classic from 1976 didn't have the 18HP engine on it, I've run at only about half throttle and it has more power than traction, and its dozer blade just pushes, hit a solid rock etc and the engine doesn't bog down, it just goes to spinning the tires and diggs. Time will tell how it holds up, so far, no complaints mechanically. The one gripe is there is nothing in the paperwork about wiring up a battery I seen, no specs on what the charging circuit or if it even has one, That is the reason for the four stars on install..... I would recommend the 420cc Bilt Hard to anyone looking to repower a classic garden tractor. It revived an old workhorse... Will it power a mowing deck? I can't say as I never intend to put a deck on this one, its just for gardening and dirt work.... ... show more
Reviewed in the United States on August 5, 2023 by Terry M.

  • Great price!
Size: 420cc Electric Start
So far so good. Start right up. Half price of Honda GX 390. 15 hp .
Reviewed in the United States on January 16, 2026 by Long H.

  • Great prices but horrible support. Don't expect any help after you purchase.
Size: 420cc Electric Start
Great company and great support. Had an issue and they took care of it! Thank you! The engine is great quality and well built.
Reviewed in the United States on July 22, 2025 by JG

  • Engine modifications
Size: 420cc Electric Start
UPDATE; After Receiving guidance and technical assistance From Bilt Hard customer service, the engine is now running very good. I added a fuel cutoff solenoid and filter and replaced the key switch to operate it. The solenoid now cuts off the gas when I shut the engine down. I also had to clean trash from the carburetor main jet but that was from my 51 year old fuel tank, that I replaced the Bilt Hard tank with so the engine would fit in my old tractor. As of this review everything is working as it should. Thanks to the Bilt Hard team for help This Engine is a piece of crap and dangerous. Could possibly explode if not careful. I forgot to turn off the gas supply and the engine filled with gas. Both the cylinder and crankcase. You should not be able to walk away for a few minutes and gas continue to flow into the engine. I would not recommend this engine to anyone. I thought about adding a fuel solenoid, but the ignition system key does not have a 12 volt output when in the on position, only start and stop. Wish I could get my money back but I had to modify the engine to fit it to my 1974 Craftsman garden tractor. ... show more
Reviewed in the United States on April 16, 2025 by Jerry Potter

  • Excellent value!
Size: 420cc Electric Start
Works great. It’s attached to a wood splitter that’s used several hours a week.
Reviewed in the United States on December 31, 2025 by Frank Schell

  • Junk right out of the box and horrible customer service
Size: 420cc Electric Start
This engine wouldn't run right out of the box. Just turns over and over and over until the starter gets too hot. Can't start by hand either. Contacted seller for a refund or replacement and just keep getting the run around. Amazon has not been helpful at all either and just keeps telling me to give the seller more time to respond to more emails. BUYER BEWARE!!!!! DON'T WASTE YOUR MONEY HERE!!!! They will take your money and send you junk. ... show more
Reviewed in the United States on July 1, 2022 by Bob

  • Extremely happy
Size: 420cc Electric Start
Absolutely amazing will buy again top notch sellers for sure
Reviewed in the United States on July 9, 2026 by Gary Birchwell

  • Good replacement motor
Size: 420cc Electric Start
Started 2nd pull, runs quiet, used it 2 days so far, excellent
Reviewed in the United States on September 19, 2025 by Amazon Customer

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