Hyundai 16"/40cm 79cc Petrol Lawnmower | HYM400P

Hyundai 16"/40cm 79cc Petrol Lawnmower | HYM400P

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Regular Price: £193.99

Special Price £145.49 ex. VAT £174.59 inc. VAT:

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  • Simple to use no fuss mower, Ideal for small to medium-sized lawns

  • Central height adjustment changes the cutting height of all 4 wheels with one lever

  • 6 cutting heights from 25mm to 75mm

  • Rust free, extra-strong polypropylene mower deck

  • Lightweight at only 19Kgs

  • Hyundai 79cc Euro 5 Engine, more efficient and less polluting

  • Full UK spares to maintain your machine for years to come

  • Covered by a 3 Year Platinum Warranty

  • Includes 600ml SA30 oil


Small To Medium Sized Lawns

The HYM400P is low maintenance petrol powered rotary lawnmower from Hyundai. A “no fuss” lawnmower ideally suited for small to medium-sized lawns up to approx. 20m x 20m, the HYM400P has a cutting width of 400mm and is powered by a 79cc 4-stroke OHV petrol engine, delivering impressive cutting power, but also low levels of noise and fuel consumption to minimise disruption and keep running costs to a minimum.

Easy Start

HYM400P easy start machine, with the option to place the recoil cord at the top of the handle which eliminates the need to bend down when starting it.

6 Cutting Heights

Single point height adjuster for all 4 wheels. With six cutting heights controlled from a central height adjustment lever ranges from 25mm for a smooth lawn to 75mm for cutting longer grass, the HYM400P puts you in control over the finish of your cut.

Ultimate Durability

With the lightweight and very durable polypropylene deck, your mower will remain free from rust and corrosion.

User Friendly

It’s quick and easy to assemble out of the box, allowing you to be mowing in no time at all, and with low servicing requirements, it will provide years of reliable service.

40L Grass Collector

With a spacious quick release 40L polyester grass catcher bag, you will spend less time emptying the cuttings and more time mowing. Attaching and removing the collection bag couldn’t be simpler, and this allows you to dispose of the cuttings quickly and conveniently.

Maximum Comfort

For increased comfort, this petrol lawnmower features a soft grip handle, which reduces fatigue when used for long periods.

Ultimate safety

The OPC (Operator Presence Control) lever will ensure that the engine will not run if you let go of the handle.

Compact Design

The handles also fold down over the main power unit, which makes this compact lawn mower easy to store in a garden shed, garage or even a vehicle.

Ultra Lightweight

Weighing just 19kg, this is one of the lightest petrol lawnmowers on the market, which is essential for hand push models to minimise fatigue and maximise manoeuvrability. It also means it can be lifted into the car boot with relative ease.

In The Box:

  • HYM400P Petrol Lawnmower
  • 40L Grass Collector
  • Assembly Tools
  • User Manual
  • Oil


Covered by Hyundai 3 year warranty.

Please Note - Latest models may differ slightly from those shown in the video due to continuous improvement.

Gross Weight (kg) 22.00
Warranty 3 Year
Model HYM400P
Engine Model Hyundai IC80V
Fuel Consumption (l/h) 0.60
Engine Type 4-Stroke OHV Single Cylinder
Power Method Petrol
Engine Size 79cc
Rated Power (kW/kVA) 1.6kW
CE Compliant Yes
Drive Push
Starting System Recoil
Height Adjustments Central Adjustment - 6 Positions
Cutting Height 25 - 75mm
Cutting Width 400mm
Catcher Volume (L) 40L
Deck Material Polypropylene
Gross Weight 22kg
Dry Weight 19KG
Fully Assembled Dimensions H x W x L 1340 x 510 x 1000mm
Starting System Recoil
Fuel Unleaded Petrol
Drive Push
Wheel Size (diameter) Front 150mm, Rear 150mm
Chassis Polypropylene Rust Free Deck
Safety Features Operator Presence Control
Cutting Height 25mm to 75mm
Cutting Width 400mm
Cutting Options Cut And Collect
Recommended For Lawns Up To Small Lawns - Under 2000sq. ft
Grass Catcher 40L, Polyester bag
Net Weight 19kg
In the box HYM400P Lawn Mower, Grass Collector, Engine Oil, User Manual, Tool

Customer Reviews 15 item(s)

Excellent value for money and well made
I bought this mower to replace a Honda which had given many years of faithful service. I was first attracted to the price which was significantly cheaper but having taken delivery (very speedy) and assembled it, I am very impressed by the build quality and easy starting. I had one query on assembly which the technical team were able to assist with over the phone. Overall, I am very happy with my purchase.
Review by BR, Leicestershire / (Posted on 18/02/2021)
Excellent product and value
Great lawn mower was perfect for our lawn and looks great too. Would recommend!
Review by FA Tranent Scotland / (Posted on 15/09/2020)
Excellent lightweight petrol mower
Bought this to replace my old Briggs & Stratton powered mower which was rusting apart. Fast delivery, starts easily, cuts well. Only slight negatives are it's a little under-powered (only noticeable when trying to cut long grass) and the grass collection box is quite small so fills up quickly.
I had a problem with hot starting, quickly resolved by customer services.
Review by AD, Luton / (Posted on 14/09/2020)
Sweet as a nut!
I originally bought an electric mower from elsewhere, however before I opened the box my son encouraged me to return it and purchase a petrol mower instead to avoid all the hassle with cables, we searched around and were going to purchase one for around £200 from a different manufacturer that had a steel deck, however we came across this one at the last minute which has a very small engine and a light polypropylene deck. The mower is great starts really easily after a few pumps on the red button, and collects the grass efficiently without blocking up. We’ve only used the mower about three times so far, but so far so good. Would recommend if you’re looking for a small light patrol mower at a reasonable price.
Review by Nance / (Posted on 13/09/2020)
This mower is excellent for the money, great service so far! Delivery was well fast and so far it seems like a very good product and well designed. (although the handle arms where they move against each other when folding/unfolding cause a nasty scratch in the nice glossy paintwork) Good work Hyundai!
Review by JM, Cambs. / (Posted on 02/09/2020)
Brilliant lawnmower
Great build quality at a good price am sure it will last for years to come
Review by j.d Scarborough / (Posted on 06/08/2020)
Lawnmower perfect, delivery service terrible
Fantastic lawnmower, good quality, easy to assamble, not too noisy and good priced, really easy starting engine. Delivery ? Nightmare, it took 18 days to deliver it, and I had to contact customer service for them to order another one for me as the first one was supposedly lost somewhere
Review by BS, Carlisle / (Posted on 01/08/2020)
Order was delivered in 2 working days. Delighted with the quality and overall experience of dealing with you.I had a query regarding some ambiguity in the safety instructions but the customer service team responded very quickly to my satisfaction. Machine has been excellent in use.
Review by Les Shillam Doncaster / (Posted on 28/07/2020)
Great product with super service
The first new lawn mower we have ever purchased (always had cast off's). Shopped around and found this model. Ordered late Monday, arrived today (Wednesday). Easy to assemble, add oil, petrol and Go. Very quite in use. Easy to adjust & very light weight. Starts first time. Looks great and appears well built. I am sure this will do us well.
Review by DJF New Forest / (Posted on 17/06/2020)
Quality Equipment
Very pleased with product, noticeable quality and design that makes this extremely good value for money. It also cuts well !

Now looking at other product purchases as never really knew much about Hyundai products until now.
Review by DB, Scotland / (Posted on 29/05/2020)
3 payments
I bought this mower and instead of paying it all at once, I paid it in 3 parts. I found this much easier as I was only paying £40 ish each payment! Have only used 3 times but so far I love it!
Review by Lisa Mayhew / (Posted on 03/08/2018)
small garden
I bought this lawnmower as it says it is ideal for small to medium gardens, and my garden is quite small. This was under my budget as I was expecting lawnmowers so be more expensive. When it arrived it looked very neat and felt good quality. I have recently used this for the first time and it was so quiet. It was very simple to use and cut the grass excellently.
Review by Miyah / (Posted on 25/07/2018)
mower review
Fantastic, works perfectly, love it!
Review by Jackie Walters, England / (Posted on 20/07/2018)
great little mower
Very impressed. Easy to start. Lightweight but powerful. Can't fault it.
Review by Chris L / (Posted on 16/07/2018)
Amazed at the low price for the well known hyundai brand. When it arrived, my partner and I were both pleasantly surprised at the high quality. One of the cheapest mowers we have ever bought but definitely one of the strongest. Delivery was very fast. Will be ordering again from Hyundai with no hesitation.
Review by Sammy Watts / (Posted on 02/07/2018)

You're reviewing: Hyundai 16"/40cm 79cc Petrol Lawnmower | HYM400P

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Hyundai Power Products

Impressive Power

Precise Cut

Easy Adjustment

Built To Last


Aftersales And Spare parts


Product Attachments

View FileHYM400P Lawnmower User Manual    Size: (2.21 MB)
View FileHYM400P Specification Sheet    Size: (368.28 KB)

Frequently Asked Questions

1. How do you change the cutting height?
You simply use the lever which cycles through the cutting heights in a matter of seconds. Click here to watch our video showing this.

2. Can you get replacement blades for this?
Yes. We have spare parts for all of our machines.

3. Can I fold down the handlebars?
The handles can fold down over the mower for compact storage and transport.

4. Is it hard to assemble?
All of our lawnmowers are quick and easy to assemble out of the box. The manual will give you a simple step by step guide on what to do. We also offer videos on YouTube to help you unbox and set up. Click here to view our YouTube channel.

5. Why do I need different heights on my lawnmower?
You should change the height you cut your lawn depending on the season. 

Spring (March / April / May) - Mow once a week on a high to medium height setting.
Summer (June / July / August) - Mow twice a week under good growing conditions on a low setting. You should mow once a week in a medium to high setting in dry conditions.
Autumn (September / October / November) - Mow once a week on a medium height setting.
Winter (December / January / February) - Mow as required on a high setting.

6. Is this mower right for my garden?
If you are not too sure what mower to go for you could take a look at our lawnmower buying guide or speak to one of our experts for some advice.
Call us on 01646 687880 open Monday-Friday 8.30am-5pm.
Online Live Chat

Open on our website Monday-Friday 8.30am-5pm.

7. Does this mower come with a warranty?
Yes. All Hyundai lawnmowers are backed up with a 3 Year warranty. Register online within 30 days to activate your 3 year warranty.

8. Can I remove the grass bag?
Yes. The grass bag is removable.

9. How can I contact you?
Call us on 01646 687880 open Monday-Friday 8.30am-5pm.
Online Live Chat

Open on our website Monday-Friday 8.30am-5pm.

10. I have a lawn that is on a slope and I am elderly and need a mower that won’t be hard work - what do you suggest?
Hand push mowers are lightweight but they have to be manually pushed along. They are great for flat lawns. They require more manual effort than a self-propelled lawnmower. If your lawn is on a slope then you may want to consider a self-propelled lawnmower instead as they propel themselves forward to reduce fatigue. All you have to do is control the path the mower takes. It makes effortless work of mowing.

11. Is the engine low emissions?
All of our petrol lawnmowers are powered by Hyundai OHV 4-Stroke Euro 5 engines. These are low emission and extremely economical petrol engines. Our engines are all easy starting and have low fuel consumption. This means the running costs are low. They are also low maintenance.

12. Do I need to mix oil with petrol?
No - use straight unleaded petrol.

13. What fuel do I use?
Use unleaded petrol or Aspen garden fuel.

14. What size lawn is this recommended for?
We recommend this lawnmower for small to medium sized lawns which are under 2000sq. ft.

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