BILT HARD 420cc 15HP Gas Engine with Electric Start, Horizontal Shaft 4 Stroke OHV Gas Motor, Gas Powered Multi-Use Engine
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Availability:
In Stock.
Arrives
Wednesday, Sep 17
Size: 420cc Electric Start
Style: 4-Stroke Engine
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
Horsepower: 15 hp
Product Dimensions: 17.5"W x 18.5"H
Brand: BILT HARD
Model Name: GASOLINE ENGINE
Speed: 3800 RPM
Horsepower: 15 hp
Product Dimensions: 17.5"W x 18.5"H
Material: Cast Iron
Shaft Diameter: 1 Inches
Manufacturer: BILT HARD
Item Weight: 82.9 pounds
Item model number: R420
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Sep 17
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
Style: 4-Stroke Engine
So far so good. Engine started on 2nd pull a ran great. And was delivered 1 day earlier than expected.
Reviewed in the United States on June 14, 2025 by B. Shelton
Now on my second lawn season. Cranks first time every time. Very powerful 4.5 hp engine, Runs quiet no smoke, and much less expensive than replacing the whole mower.
Reviewed in the United States on June 1, 2025 by Steve Norton
Size: 212cc
Style: 4-Stroke Engine
Had this engine for two weeks. Used to replace an engine on a homeowner chipper. Seems to run ok. The only thing notable it seems to be exceptionally loud when starting and stopping, as if there’s something loose internally. 👍 after exceptional support from Bilt Hard the issue of noise has been eliminated. I have changed my review to 5 Stars. The company continued to provide support until I was satisfied with the performance of the engine
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Reviewed in the United States on May 9, 2025 by Robert W.
So, I just bought a second one of these engines. I waited until I had an entire season of mowing on the first one before I wrote a review. I can now say it starts and runs just as good as it did 7 months ago. I have an old MTD Professional push mower with a stainless steel deck and after 25 years the original Honda engine was done. I couldn't imagine tossing the shiny old MTD. That stainless deck is worth more than an entire new mower, so I gambled on one of these Bilt-Hard engines. I read enough other reviews to have a new ⅞" blade adapter, throttle cable, and tap set ready. Properly prepared, the motor swap took less than an hour and it started on the first pull. The fuel economy and power are impressive. I have ⅓ acre and can usually mow it twice on a tank of gas with the engine barely at half throttle. This is the first time I've been able to mow the denser parts of my lawn with any mower without it stalling or bogging down. The second engine I installed on an old self-propelled mower. That took marginally longer, but the second one also started on the first pull and at full throttle and I have to run to keep up with it. This 4.4hp engine feels much stronger than the nameplate suggests. My self-propelled mower had a 7hp engine and there isn't the slightest indication that the mower is underpowered with the 4.4hp. I have two bits of advice for anyone buying one of these. First, and this is good advice for any new small engine. Change the oil after each of the first 2 or three runs, I did find some small debris in the oil after the first change. Second is that this engine needs the blade brake and ignition shutdown lever fully engaged. If your cable is old and stretched, you might find it stalling out or hard to start. The cables on both of my mowers needed adjustment.
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Reviewed in the United States on November 25, 2024 by Jim
Size: 420cc Electric Start
Style: 4-Stroke Engine
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.
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Reviewed in the United States on April 16, 2025 by Jerry Potter
Size: 212cc
Style: 4-Stroke Engine
Solid Motor – Starts Easy, Runs Great Installed this motor on a leaf vac. It started right up on the second pull and has been running smooth ever since. Performance is exactly what I expected—plenty of power, no issues. One thing to note: the original motor had a 1-inch shaft, but this new one has a 3/4-inch shaft. It worked out fine, but I’d recommend they include or at least suggest an adapter in the "frequently bought together" section to make the swap easier for others. Ran it for a good while using about half a tank while sucking up leaves—worked great.
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Reviewed in the United States on April 21, 2025 by Jon hammer
Size: 212cc
Style: 4-Stroke Engine
Runs good out of the box, used sae 30 conventional, couple of slow pulls to get it coated and she's good to go Much nicer looking than other 212s and seems to be compatible with the modifications available for other brands. Price was good, delivery was quick and much less of a headache than waiting for restocks
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Reviewed in the United States on May 7, 2025 by Cyrus