BILT HARD Gas Engine Vertical Shaft, 173cc 4.4 HP 4-Stroke Gas Motor, Replacement Engine for Lawn Mower, EPA & CARB Compliant
Condition: New
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Availability:
In Stock.
Arrives
Sep 23 – Sep 25
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Size: 173cc
Style: 4-Stroke Engine
Features
- Unleash Dynamic Energy - Embrace the strength of a 173cc displacement 4-stroke vertical cylinder gas engine, boasting remarkable torque of 6.64 ft.lbs @2500 RPM. Capable of reaching a maximum speed of 3600 RPM, it's equipped with a staggering 4.4 maximum horsepower, all fueled by a 0.26-gallon tank.
- Precision Shaft Specifications - Dive into the specifics of our engine with a 7/8-inch diameter shaft measuring 3.16 inches in length. The end is meticulously tapped with 3/8-inch - 24 UNF threads, further enhanced by a 3/16-inch keyway. The mounting pattern spans 8 inches, while the engine features a 3/8"-24 UNF tapped hole and a 0.079 x 0.34-inch through-hole.
- Safety at the Forefront - Safety is paramount, evident in the built-in Force Air-Cooled, Splash Lubrication System, and Low oil shutoff function. Our engine spark plug system accommodates RA6HC/DCPR7E/DK7PTC spark plugs, offering a clearance of 0.027-0.031 inches. This engine is the perfect replacement for your lawnmower, ensuring a blend of power and security.
- Vital Note - Kindly note that our engine is shipped dry to ensure freshness. Before starting, be sure to add gasoline and engine oil correctly (please note, oil is not included).
- Certified Excellence - EPA and CARB Compliant. Our gas engine meets the highest standards of quality and compliance, proudly bearing both EPA and CARB certifications. Rest assured, each engine undergoes Oil Testing before packaging, so it may have a slight oily touch, signifying its 100% new condition.
Brand: BILT HARD
Speed: 3600 RPM
Horsepower: 4.4 hp
Product Dimensions: 11"W x 15.6"H
Material: Cast Iron
Brand: BILT HARD
Speed: 3600 RPM
Horsepower: 4.4 hp
Product Dimensions: 11"W x 15.6"H
Material: Cast Iron
Item Weight: 12.5 Kilograms
Shaft Diameter: 3.27 Inches
Manufacturer: BILT HARD
Item Weight: 27.5 pounds
Item model number: RV170
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 23 – Sep 25
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
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 BoxBoy
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
The media could not be loaded. I love this engine it works great, has 1 uses with the valves not being tightened at the factory but they sent me a whole new engine free of charge n the replacement runs great with zero issues....the only thing I'd recommend is getting a better pull start after about 30 pulls it start to eat away at the cord and actual pull start plastic but other than that 10/10
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Reviewed in the United States on August 30, 2025 by zachary stahl zachary stahl
Size: 420cc Electric Start
Style: 4-Stroke Engine
Pros: Good Price; Runs well Cons: Battery not included; Oil not included; bolts&nuts to secure engine on the chassis not included; bolt set to secure pulley on the shaft not included. THE WORSE AND MOST RIDICULOUS: cable to connect battery and engine not included The customer needs to figure out how to install.When one add the cost of all extras and labor required, it gets close to the price of well known and reputable brands.
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Reviewed in the United States on February 22, 2025 by U. Fernandes
Size: 212cc
Style: 4-Stroke Engine
This thing run great. Was scared to get on due to mixed reviews but I'm glad i got it. It's well broken in easy to start and seems to be solid. Has plenty of power for my tiller
Reviewed in the United States on July 12, 2025 by James Johnson
Size: 173cc
Style: 4-Stroke Engine
This is a good value engine, but I did have to tinker. First off, this is the exact same engine as Harbor freights predator line. The manual is word for word and everything on the engine is the same but the cover. This came from the same factory, but this is 50 dollars cheaper. I bought the 173cc lawn mower engine. With that said this engine died on me every 20 minutes. The fix is easy and I think it explains most of the dead engines from the 1 star review. They did make the troubleshooting time worth it for me. The problem is the emergency stop circuit. I would describe this as a design flaw. The emergency stop circuit is very simple. There is a terminal on the ignition coil. This terminal goes to a wire that screws onto part of the engine. The other end of the wire that connects to the engine has a terminal as well. A lever makes contact with that terminal to ground the circuit and shut the engine off. The lever goes to the cable on your mower. The problem is there is no adjustment for that terminal to lever connection. For me when the mower got hot the terminal would deform and make contact to the lever. This caused sputtering and then eventually it would shut down until the engine cooled and terminal no longer made contact with the lever. The fix is easy, about 10 minutes and free. Take the 3 screws off the cover. Remove the cover. Take the 3 nuts off the internal cover and remove those. Follow the wire from the ignition coil to where it connects to the engine and bend that terminal down slightly. When the engine is running verify you have about half the lever travel with engine on and half with engine off. This will mean a safety factor on both sides. You can also use a multi meter. Connect one lead to the wire and the other to the engine body. Adjust until you get continuity for half the lever travel and no continuity for the other half of the travel. A troubleshooting step is to remove the wire from the ignition coil when your unit won't start. If you do this you will have no means to turn the engine off. You will have to run out of gas, pull the spart plug wire, or ground the terminal on the ignition coil. Be careful of the mower blade. Hopefully this helps.
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Reviewed in the United States on April 27, 2024 by Amazon Customer
Size: 212cc
Style: 4-Stroke Engine
I ordered this for my Coleman CT200U-EX because HF was out of Predator Engines within 100 miles of me and this had a two day delivery and i kind of like the color. Plus it got good reviews. But after shipping was delayed twice on this engine, I was able to locate a Predator 224 at my local HF. I installed it and was very pleased with it's performance, but I had already painted my bike blue in anticipation of the Built Hard Engine and the Predator didn't look the great. Then this guy finally showed up and I swapped it in. Started first pull, is a little quieter than the Predator, and seems to perform just as well as the 224. Plus it looks great. Very happy with this purchase so far and would not hesitate to buy another if needed for another project.
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Reviewed in the United States on February 4, 2025 by Shawn B. Shawn B.