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The Ariens classic lm21s (21") 6-hp self-propelled lawn mower w/ kawasaki engine has been discontinued and is not available for purchase at this time.


Ariens Classic LM21S (21") 6-HP Self-Propelled Lawn Mower w/ Kawasaki Engine

(Based on expert analysis, manufacturer ratings and customer reviews)
4.0 out of 54.0 out of 54.0 out of 54.0 out of 54.0 out of 5
3 Reviews
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Mid Grade Lawn Mowers
Self-Propelled Lawn Mowers
Surface Area
Medium Home
Hilly Terrain

Cutting Inches
Kawasaki Engine
6 HP/179cc Kawasaki FJ180V Engine
Durable and reliable for years of service

Self Propelled
Infi-Speed variable speed drive
Rear wheels engage to drive mower at up to 4mph

21 Inch Steel Deck With Baked On, Powder Coated Finish
14 gauge stamped steel deck for added durability & airflow
Resists the effects of moisture, fertilizers, & chemicals

Tool-Free Height Adjustment
Dial in one of six cutting heights for a manicured look

Ergonomic Design Is Easy To Operate
Comfortable twin bail handle design
4 position handle bar accomodates any user
Handle folds down for compact storage

Large 2.5 Bushel Bagger
High lift blade maximizes bagging efficiency
Wire bagger frame is easy to empty and attach

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  Model Number:911183
 Made in USAYes
 Engine BrandKawasaki FJ180V
 Starting SystemRecoil Start
 HP/CC6 HP/179 cc
 Fuel Tank Size.53 Gallon
 Cylinders1 Cylinder
 Consumer Warranty3 Years
 Drive WheelsRear Wheels
 Maximum Speed4.0 Mph
 Maximum Reverse Speed0.0 Mph
 Front Tire Size7.5 Inch
 Rear Tire Size10.5 Inch
 Tire TypePlastic Wheels
 Cutting Options3-in-1 (Side-Discharge/Bag/Mulch)
 Spindle MaterialSteel
 Blades1 Blade
 Positions6 Positions
 Cutting Height1-3.25 Inches
 Rear BaggerIncluded
 Mulcher KitIncluded
 Hour MeterNo
 Weight104 Lbs. (47.17 kilograms)
 Dimensions61.5L x 23W x 38H
(156.21 x 58.42 x 96.52 cm)
 Consumer Warranty3 Years
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  1 Question
Q: My Question is I'm looking for the 21 comm lawn mower. I looking at the Toro model#22195-Ariens model#911183 Honda model #hrx or the top of line 21 exmark. Please let me which lawn mower cut the best and bag the best. Please let know asap. Thank You.
by Kenneth Hickman from Michigan on March 26, 2011

A: Any one of these would give you a nice quality cut and good for bagging. Not too familiar with the Toro and Exmark models, but the Honda and Ariens models would be very high quality.

A nice feature you find on the Ariens would be the Kawasaki engine, but this mower is not rated commercially, but in reality can stand up to most other commercial units. The Honda is a nice option as well as Honda uses their Honda GX engine on this model and this is one of the most popular and highest rated commercial engines on the market.


Mowers Direct
by Jose, Product Expert

Ariens 911183 Reviews & Ratings
Overall Rating
4.0 out of 54.0 out of 54.0 out of 54.0 out of 54.0 out of 5
I'd Buy It Again (1)
Reliable (1)
Fast (1)
Easy To Use (1)
Heavy (1)
3 Reviews  Sort by 
San Antonio, TX
Total Reviews
4 Reviews
Total Helpful Votes
40 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Kaw Power!
I have owned this mower for the last 6 going on 7 years. I have beat on it and put it through hell. I am so impressed with the Kawasaki engine FJ180's sheer power, easy starting and ability to handle thick and tall grass/weeds.

The only downside has been the leaking plastic gas tank (common failure) which I replaced. Ariens designed the steel deck of this mower for high lift which makes repeated passes unnecessary. I will keep my Ariens until the wheels fall off... and then buy some... more
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Chuck Tyler
Vancouver, WA
Purchased from Power Equipment Direct
Purchased 4/26/13
5 out of 55 out of 55 out of 55 out of 55 out of 5
Starts First Pull Everytime!
East start, reliable.
Pros: Easy To Use, Fast, Reliable, I'd Buy It Again
Cons: Heavy
Chuck Recommends This Ariens Mower
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Mike Hammersmark
Surrey, IL
2 out of 52 out of 52 out of 52 out of 52 out of 5
Use The Right Tool For The Job
Ariens used to be one of the best mowers, however the company seems to be moving into trying to supply the cheaper home owner models.

For years the height adjustments have been wearing out and breaking, the bags don't even last a season, the transmissions slip in the rain and wear out quickly, the handles break of at the deck and the wheels wear quickly.

It is very expensive the fix the transmission and the bag alone cost $100. For commercial use a Honda is the best bet for this size... more
Jose, the Lawn Mower Expert
Product Expert
Our web site clearly states that this unit is considered a Homeowner grade mower. They come with a 2 year Factory warranty, but only for Homeowner use, not Commercial applications. You are using the wrong tool for the job.

A push mower that will meet the day-in, day-out demands of a professional would need to be heavier duty, and more expensive, than a Homeowner model.

The Ariens Pro 21 (911271) has heavier duty components, and a slightly higher price tag than the Homeowner unit; but your investment will last longer without the expensive repairs.
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