Amerisun AV8621S1 Self-Propelled Gas Lawn Mower Review
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Last updated October 31, 2026
The Amerisun AV8621S1 is a sensible buy for a homeowner with a flat to gently sloped lawn of up to about half an acre who wants gas power and rear-wheel self-propel at the entry end of the market. Buy it if you want a 21-inch cut, a 170cc engine and 3-in-1 mulching, bagging and side discharge without paying premium-brand money. Skip it if your yard is steep or well over half an acre, or if you expect variable speed and easy local parts support.
This assessment rests on the published specifications, the owner's manual and the pattern of what buyers on Amazon report, not on a machine in hand. The 170cc OHV engine, rear-wheel drive, steel deck and folding handle are what make it a reasonable proposition for the money.
What the Amerisun AV8621S1 does well
The 170cc 4-cycle OHV engine drives a 21-inch cut. The auto-choke recoil starter means pull the cord and the engine catches without a priming ritual.
Rear-wheel drive puts the power on the rear wheels, so the mower keeps traction on uneven ground and up a slight incline. The 3-in-1 setup lets one machine mulch, bag into the rear catcher or throw clippings out the side, which covers different routines and seasons without a second tool.
A single lever moves the deck through six positions from 1.5 to 3.9 inches. The quick-folding handle collapses for compact storage.
Buyers on Amazon also rate value for money positively, and the feature set is generous for an entry-level self-propelled gas mower.
Where the Amerisun AV8621S1 falls short
The drive system is the weak point. Amazon's summary of its customer reviews notes that speed gets mixed feedback, with several buyers finding the single-speed auto drive a little too fast to modulate. The self-propelled function can weaken or fail over time, usually because of the drive belt or the control cable.
There is no variable-speed control and no differential. Quality feedback is mixed too: most buyers are satisfied, but a minority report hard starting, an uneven cut, vibration or parts working loose.
The warranty is 2 years limited for home use and 90 days commercial, and it excludes wear parts such as drive belts, blades and grass bags, plus carburetor damage from stale fuel. Warranty service generally means shipping the unit back at your cost with proof of purchase.
The mower is rated for up to about half an acre. Single-speed rear-wheel drive without a differential is not the tool for a hillside.
The product in this review
Amerisun AV8621S1 21in self-propelled gas lawn mower
See on AmazonThe AV8621S1 Numbers That Decide Whether It Fits Your Lawn
| Specification | Figure |
|---|---|
| Engine | 170cc 4-cycle OHV, air-cooled, auto-choke, recoil start |
| Cutting width | 21 in. |
| Drive | Rear-wheel drive, self-propelled |
| Cutting functions | 3-in-1 (mulch, rear bag, side discharge) |
| Cutting height | 6 positions, 1.5 to 3.9 in., single-lever adjustment |
| Deck | 15-gauge steel |
| Wheels | 7 in. front, 8 in. rear |
| Weight | 66 lb |
| Assembled dimensions | 59.8 in. deep, 26.7 in. wide, 38.4 in. high |
| Storage | Quick-folding handle, up to 70% space savings |
| Blade | Heavy-duty |
| In the box | Engine, auto-choke, recoil starter, heavy-duty blade, front and rear lever controls, 7 in. front and 8 in. rear wheels |
| Warranty | 2-year limited for home use; wear parts excluded |
The 21-inch cut and 170cc engine suit a typical suburban lawn. The 1.5-inch low setting gives a close cut, and the 3.9-inch top setting handles summer growth. The folding handle matters if your storage space is tight, and the 66 lb weight means you can move it around the yard.
The AV8621S1 for your yard, and the lawns it was never built for
A flat to gently sloped lawn of up to about half an acre is the sweet spot. The homeowner who wants gas power and self-propel without paying premium-brand money gets a capable machine.
Steep or hilly yards are a poor fit, and so are lawns well over half an acre. Anyone who wants variable-speed drive or a tight turning radius should look at other designs. So should anyone who expects local dealer service and easy walk-in parts, because warranty service generally means shipping the unit back.
The Amerisun AV8621S1 is a solid budget choice for the homeowner with a modest, fairly flat lawn who wants gas power, self-propel and 3-in-1 cutting. Approach it with realistic expectations about the single-speed drive and the warranty's wear-part exclusions.
Buy it if your yard is flat to gently sloped and up to about half an acre. Skip it if you have steep ground or a large lawn, or if you want variable speed and easy local service.
Frequently asked questions
The questions that decide a purchase of this mower come down to its drive system, its included oil and what its warranty leaves out.
What size wheels does the Amerisun AV8621S1 ride on?
The Amerisun AV8621S1 rolls on 7-inch front wheels and 8-inch rear wheels. The bigger rear pair carries the drive.
How finely does the Amerisun AV8621S1 chop clippings for mulching?
The Amerisun AV8621S1 uses a heavy-duty blade shaped to reduce grass to very fine pieces.
What quality complaints do owners raise about the Amerisun AV8621S1?
Most Amazon reviewers are satisfied overall, and the complaints that do appear tend to cluster around the engine and the cut rather than the deck or the handle. Hard starting, an uneven cut, vibration and parts working loose are the recurring themes, and they show up in a minority of reviews rather than across the board.
Is the Amerisun AV8621S1 sold in more than one version?
The Amerisun AV8621S1 comes as a single self-propelled, rear-wheel-drive configuration packed one to a box. No push-behind or electric variant carrying this model number appears in its listing.