BILT HARD 420cc 15HP Gas Engine with Electric Start, Horizontal Shaft 4 Stroke OHV Gas Motor, Gas Powered Multi-Use Engine
Condition: New
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Availability:
In Stock.
Arrives
Monday, May 18
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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.
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
Item Type Name: Gas Engine with Electric Start
Included Components: 15HP Gas Engine Horizontal Shaft with Electric Start
Unit Count: 1.0 Count
Warranty Description: We guarantee this product to be free from defects in materials and workmanship 30 days from the date of purchase.
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
If you place your order now, the estimated arrival date for this product is:
Monday, May 18
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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
Size: 212cc Manual Start
Perfect replacement engine for my tiller. Starts and runs great.
Reviewed in the United States on March 18, 2026 by Gale Kesler
Size: 212cc Manual Start
I bought this to use on my old Brave logsplitter, as the 30+ year old Briggs finally gave up the ghost. I was dubious, but the price between this and a new brand-name motor was nearly $500! It installed easily, even though one of the pump bracket holes stripped out. Aside from that, it was a seamless installation. It starts right up, usually on the first pull. It runs the splitter great, with power to spare. Oil changes are easy. I have nothing bad to say about this motor, and would buy it again.
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Reviewed in the United States on November 28, 2025 by lori puryear
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....
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Reviewed in the United States on August 5, 2023 by Terry M.
Size: 212cc Manual Start
Put a log spilter works good so far
Reviewed in the United States on March 20, 2026 by Robby
I have to say that this little engine works great. I got this to replace my weak 2.70 HP engine on my push mower and I wasn't disappointed. It runs smooth and it quiet compared to my old engine. Also burns half the gas my Briggs used. I was pretty amazed by that. The brake cable fit right up and I had to install a throttle cable since my old one was set from the factory. And you have to thread the mounting holes in the engine. I threaded mine 3/8" NFT. But I am very satisfied so far. Only thing was the shaft was about 1" longer than my original which was fine in my case but might not work for others. Definitely would recommend. 1 year Update: still runs great but burns oil pretty bad. So buyer beware. Keep your eye on the dip stick.
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Reviewed in the United States on October 7, 2024 by Gadams
Size: 212cc Manual Start
Great engine, good power without being modded, only had to adjust the idle, fill with oil and after first start inow starts first pull with little effort. My hubs just rehabed a Murray Explorer go kart for street use with this engine and have not done any mods We have it driving a 30 series torque converter with racing belt and green spring in the driven pully to a jack shaft to a 420 roller on a 60 tooth sprocket. is 4 x 4 wheel hubs on a 1” live axle with golf cart wheels and tires Our new toys flies!
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Reviewed in the United States on December 12, 2025 by Heather Webb
Size: 212cc Manual Start
It's a great engine. I had a different brand engine on this tiller that had extremely low service hours on it but I failed to take adequate precautions and allowed the carburator to totally rust up. Ordered this last March and didn't actually get around to installing it until last fall. Just left it setting inside the shed with no gas. Broke it out above 3 weeks ago and actually had to use old gas in it because of time constraints. It fired and ran just fine with the old gas. Got back down there this past Sunday with new non ethanol gas with a fuel treatment added. Fired right up on the first pull. It's got a ton of power so I'm keeping it pretty low throttle and no strain whatsoever. Tremendously pleased with this engine
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Reviewed in the United States on March 26, 2025 by BoxBoy
Size: 212cc Manual Start
Was skeptical at first, however decided to take the chance. Arrived relatively soon and was packaged pretty well for shipping. Came just as photo appears. Started within one or two pulls, did have a noise in lower end that was concerning and sounded like if the motor was over revved would come apart, could be reason for the one review I seen. I let idle for a good while and as it broke in the sound dissipated to completely gone. Afterwards I applied more throttle to it and installed the torque converter. All seemed to go well, starts real easy and idles very well and ran it a full speed for a short while. I also did not think the vibration was really that bad for a small engine. I think where "some" of the mixed reviews is they are not giving enough break-in time. Just like any new motor comes with no oil and not broken in. So you have to take your time and add the new oil, just over a half a quart and I added some mystery in there just cause, may void a warranty but I will take the risk. Let it idle and keep at low RPM until it has time to break-in. Would have given 5 stars but hesitant since it has only had a an hour of run time and the throttle is really stiff on it. Did get a little better with some use but still I will need to go in there and loosen it up before it can be used. Does take the UNF bolts from the converter if that helps anyone.
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Reviewed in the United States on July 29, 2025 by TJ