Is the thinkstar mower self-propelled?

Yes. It has a self-propelled drive, so the mower pulls itself forward and you steer it. It has one forward speed rather than a variable-speed control.

How tall can I set the cut?

Cutting height adjusts from 25mm to 75mm. That range covers a close trim and taller grass; for new or thick grass, set the deck higher.

Does it mulch or side discharge?

The listed setup is rear bagging into the 60L catcher. No mulching plug or side-discharge chute is included, so clippings go in the bag.

It uses a pull-start on the 173cc DV173 engine. There is no electric start or battery, so it starts the way a conventional gas mower does.

What comes in the box?

The mower, a user manual and an installation tool. The grass catcher is part of the mower; no oil or fuel is included.

How does it compare with a cordless mower?

It has more sustained power and no battery runtime limit, and the 20-inch deck is larger than most cordless walk-behinds. In return it is heavier, louder and needs fuel and oil.

Where can I buy the thinkstar 173cc 20-Inch Self-Propelled Lawn Mower?

2 stores we checked sell it, including Amazon, Sears.

thinkstar 173cc 20-Inch Self-Propelled Lawn Mower

Best price now

$326.38at SearsChecked 11 h ago

Compared across 3 stores. Prices are checked against each store and labelled with when.

Visit Sears

thinkstar 173cc 20-Inch Self-Propelled Lawn Mower

Best price now

$326.38at SearsChecked 11 h ago

Compared across 3 stores. Prices are checked against each store and labelled with when.

Visit Sears

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Price facts

Best price today: $326.38 at Sears (checked Nov 14, 2026).
Checked at 3 stores.

Our take on the thinkstar 173cc 20-Inch Self-Propelled Lawn Mower

The thinkstar 173cc is a gas self-propelled walk-behind mower with a 20-inch steel deck and a 173cc DV173 engine. It drives itself, so you guide rather than push, and the cutting height adjusts from 25mm to 75mm across the deck. A 60L rear catcher holds clippings, and the folding ergonomic handle keeps storage compact. It suits mid-size yards where a cordless mower's runtime is a worry, but it is a basic machine: no electric start, no mulching or side-discharge kit listed, and no brand track record to lean on.

Best forHomeowners with a quarter-acre to half-acre lawnBuyers who want gas power without push effortMowing thicker or uneven grass with height adjustmentShoppers who prefer a simple, mechanical mower

Pros

Self-propelled drive eases mowing on slopes and long runs
20-inch deck covers ground faster than 18-inch rivals
Wide 25-75mm height range handles short turf and tall growth
60L catcher means fewer emptying stops
Folding ergonomic handle aids storage

Cons

Pull-start only; no electric start or battery assist
No mulching plug or side-discharge chute listed
Single forward speed, so pace is fixed
No brand service network or spare-parts history to rely on
Heavier and louder than a cordless mower

thinkstar 173cc 20-Inch Self-Propelled Lawn Mower prices at every store

SearsNew
In stock
$326.38Free shippingChecked 11 h ago
Visit Sears
SearsNew
Availability unknown
$363.55Checked Nov 5
Visit Sears
AmazonNew
Availability unknown
As an Amazon Associate, Deal.ai earns from qualifying purchases.
$140.04+ $260.00 shippingChecked 11 h ago
Visit Amazon

Store links may earn us a commission.

thinkstar 173cc 20-Inch Self-Propelled Lawn Mower price history

$363.55$140.04

Nov 5Nov 14

Lowest price we've seen: $140.04 on Nov 14 at Amazon; highest $363.55 on Nov 5. Tracked across 3 stores since Nov 5.

From Sears

173cc DV173 engine
20-inch (51cm) cutting deck
Self-propelled
60L grass catcher
Cutting height adjustable from 25-75mm
Ergonomic handle and easy start

Materials: Metal, Plastic
Care: Clean the bottom of the mower deck after each use; remove grass clippings, leaves, dirt and other debris. Keep the discharge container clean.
Guarantee: All marketplace sales are backed by the Sears Marketplace Guarantee: get the product you ordered, when you expect it, or get your money back, original shipping
Returns: Returns of all kinds accepted within 30 days of the delivery date; refunds issued in the same form as the original payment method.
Shipping: FREE Shipping is available.
In the box: 1 x Lawn Mower, 1 x User Manual, 1 x Installation Tool

About the thinkstar 173cc 20-Inch Self-Propelled Lawn Mower

This is a self-propelled rotary lawn mower with a 173cc DV173 engine. It runs at 2800 r.p.m. and has a 20-inch (51 cm) cutting deck. The body is made of metal and plastic.

Cutting height adjusts from 25 to 75 mm. A 60 L grass catcher collects clippings. The handle is ergonomic, and the engine has an easy-start feature.

For use, keep the discharge container clean. Do not cut wet grass, and do not tilt the machine when starting it. Use a higher blade height for new or thick grass. Keep hands and feet away from the turning parts. Do not override the start button or the bail switch.

Model: DU12176-51B3
Engine: DV173, 173cc displacement
Speed: 2800 r.p.m.
Drive: Self-propelled
Blade system: Rotary
Cutting width: 20 in (51 cm)
Cutting height: 25-75 mm
Grass catcher: 60 L
Material: Metal, plastic
Dimensions: Approx. 125 cm L x 50 cm W x 100 cm H (49.21 in x 19.69 in x 39.37 in)
Care: Clean the underside of the deck after each use, removing grass clippings, leaves, dirt and debris. Keep the discharge container clean.
In the box: 1 x lawn mower, 1 x user manual, 1 x installation tool

Specifications

Blade System: Rotary
Cutting Width: 20″ deck

Questions and answers

Is the thinkstar mower self-propelled?: Yes. It has a self-propelled drive, so the mower pulls itself forward and you steer it. It has one forward speed rather than a variable-speed control.
How tall can I set the cut?: Cutting height adjusts from 25mm to 75mm. That range covers a close trim and taller grass; for new or thick grass, set the deck higher.
Does it mulch or side discharge?: The listed setup is rear bagging into the 60L catcher. No mulching plug or side-discharge chute is included, so clippings go in the bag.
How does it start?: It uses a pull-start on the 173cc DV173 engine. There is no electric start or battery, so it starts the way a conventional gas mower does.
What comes in the box?: The mower, a user manual and an installation tool. The grass catcher is part of the mower; no oil or fuel is included.
How does it compare with a cordless mower?: It has more sustained power and no battery runtime limit, and the 20-inch deck is larger than most cordless walk-behinds. In return it is heavier, louder and needs fuel and oil.
Where is the thinkstar 173cc 20-Inch Self-Propelled Lawn Mower cheapest?: At Sears, for $326.38, as of our latest check.
Where can I buy the thinkstar 173cc 20-Inch Self-Propelled Lawn Mower?: 2 stores we checked sell it, including Amazon, Sears.