Product Review: Self Propelled Gas Lawn Mower, 21" with 170cc 4-Cycle OHV Engine 3-in-1 RWD Self-Propelled Lawn Mower (AV8621S1)
Introduction
If you’re looking to buy self propelled lawn mower online or find a reliable gas lawn mower for sale, the AMERISUN AV8621S1 is worth a close look. This self propelled lawn mower combines a 170cc 4-cycle OHV engine with a 21-inch cutting deck and a rear-wheel drive (RWD) system. In this review I’ll walk you through the features, performance, pros and cons, and who should consider this model—so you can decide whether this is the best 21 inch self propelled mower to buy for your yard.
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What is this product?
Overview
The Self Propelled Gas Lawn Mower, 21" with 170cc 4-Cycle OHV Engine 3-in-1 RWD Self-Propelled Lawn Mower (AV8621S1) is a gas-powered push mower with an integrated self-propel system. It’s marketed as a durable, easy-to-use lawn mower for homeowners who want a balance of power and convenience. This is a 21 inch 170cc 4-cycle OHV gas self propelled rear wheel drive mower designed for midsize lawns and light slopes.
Who makes it?
AMERISUN offers this model as part of their outdoor power equipment lineup. The model number AV8621S1 helps when you search where to buy AV8621S1 or look for the owners manual self propelled 21 inch mower specifications.
Key Features
Below are the most important features based on the manufacturer’s description:
- Powerful Engine: 170cc 4-cycle OHV engine with auto choke and forced air-cooling for smooth starts and reliable operation.
- Efficient Yard Care: 21-inch heavy-duty blade and reinforced steel deck for clean, fine cuts and reduced clumping.
- Self Propelled System: Rear wheel drive (RWD) provides good traction on flat surfaces and moderate inclines—ideal for a self propelled lawn mower for hilly terrain 170cc RWD.
- Height Adjustment: Single-lever, 6-position height adjustment from 1.5 inches to 3.9 inches.
- Easy Assembly and Storage: Arrives fully assembled in the box—simply unfold the handle, and it’s ready. The handle folds for space-saving storage.
- 3-in-1 Capability: Bagging, mulching, and side discharge allow flexible grass management—this is a true 3-in-1 bag mulching side discharge self propelled gas mower.
Detailed Description
Performance and Engine
The 170cc 4-cycle OHV engine delivers consistent power for regular lawn maintenance. Because it’s a 4-cycle design, you don’t need to premix gas and oil—an important convenience when you want a simple, quick start. The auto choke system helps with cold starts, and the forced air-cooling maintains operating temperature during longer mowing sessions. If you plan to purchase 170cc gas mower for reliable performance, this engine is a solid option.
Cutting and Deck
The 21-inch deck is large enough to reduce mowing time compared to 19-inch models, yet compact enough for tight spaces. The reinforced steel deck and heavy-duty blade produce finer clippings, which helps mulching and bagging options work well. This model truly earns the tag easy start 4-cycle 170cc 21 inch mower with mulcher.
Drive and Handling
Rear wheel drive makes it easier to handle undulating yards and light slopes without losing traction—this is why some buyers search for a rear wheel drive mower or RWD lawn mower. The self-propelled system reduces fatigue and speeds up the job for medium-sized yards.
Pros and Cons
Pros
- Powerful 170cc 4-cycle engine—no fuel/oil premix required.
- 21-inch deck offers efficient mowing coverage.
- RWD self-propelled drive gives good traction on slopes.
- 3-in-1 versatility (bag, mulch, side discharge).
- Simple height adjustment and easy assembly out of the box.
Cons
- Not ideal for very steep terrain or commercial use—best for residential yards.
- Gas maintenance required (fuel storage, seasonal care).
- Heavier than lightweight electric mowers—consider if you need maximum portability.
Who Should Buy This Product
This mower is best for homeowners who want to buy a gas mower with 4-cycle engine that balances power and convenience. Ideal buyers include:
- Owners of medium-sized lawns (0.25–1 acre) who want a reliable 21 inch lawn mower.
- People who prefer gas power for longer run times and steady torque.
- Anyone searching for the best 21 inch self propelled mower to buy on a budget—this model is frequently positioned as a value option among cheap self propelled mower choices.
- Homeowners with slightly hilly yards who want a self propelled lawn mower for hilly terrain 170cc RWD.
Comparison with Similar Products
Compared to smaller 19-inch push mowers, this 21-inch RWD model reduces mowing time and handles thicker grass better. Versus larger commercial mowers, the AV8621S1 is more affordable and easier to store, though it lacks the heavy-duty durability of commercial units.
If you’re comparing to electric or battery models, consider:
- Gas advantages: longer run-time, no recharge downtime, higher torque for thick grass.
- Electric advantages: lower noise, no emissions, lighter weight.
For homeowners searching to shop rear wheel drive mower or find self propelled mower deals, the AV8621S1 represents a middle ground: powerful and versatile without the high price tag of premium brands.
Frequently Asked Questions
Is the AV8621S1 easy to start?
Yes. The auto choke and 4-cycle OHV design make cold starts simpler than older primer-style engines. Follow the included owners manual for best results.
Can this mower handle slopes?
It handles light to moderate slopes well thanks to the rear wheel drive. For very steep terrain, consider a walk-behind with traction-rated tires or a self-contained riding mower.
Where can I buy the AV8621S1?
You can buy now on Amazon or search local dealers, but Amazon often lists current self propelled mower deals and shipping options.
Final Verdict
Overall, the Self Propelled Gas Lawn Mower, 21" with 170cc 4-Cycle OHV Engine 3-in-1 RWD Self-Propelled Lawn Mower (AV8621S1) is a compelling option if you want a dependable, gas-powered self propelled lawn mower with a 21-inch deck and strong traction from a rear wheel drive system. It’s particularly attractive for those who want to purchase 170cc gas mower capability without stepping up to heavy commercial equipment. If you want to buy self propelled lawn mower online or are searching
for a cost-effective 21 inch 170cc 4-cycle OHV gas self propelled rear wheel drive mower, this model is worth considering.