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Mountfield SP51H 3-in-1 Self-Propelled Petrol Lawnmower (with Honda Engine)

Original price was: £459.00.Current price is: £399.95.

  • A classic petrol rotary mower from one of the UK’s favourite garden machinery brands!
  • Offers bagging, mulching and rear-discharge as standard
  • New generation OHV engine from Japanese engineering giants, Honda
  • Self-propelled drive for the easy coverage of tussocky grass
  • Strong and durable steel mower deck
  • Large-capacity canvas catcher with a dust-limiting hard top
  • Cutting-height quick and easy to set using a single lever
  • Large, high-traction drive wheels aid long-grass manoeuvrability
  • Handy ‘bag full’ indicator
Mountfield SP51H
Mountfield SP51H 3-in-1 Self-Propelled Petrol Lawnmower (with Honda Engine) £459.00 Original price was: £459.00.£399.95Current price is: £399.95.
Mountfield SP51H
Mountfield SP51H 3-in-1 Self-Propelled Petrol Lawnmower (with Honda Engine)
£459.00 Original price was: £459.00.£399.95Current price is: £399.95.
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Built to Mountfield’s consistently high standards, and offering numerous quality features and high-performance cutting, the powerful Mountfield SP51H Petrol Lawnmower is one of the best-value machines in its class!

That power is supplied by a Honda GCVx145 engine; a pro-grade air-cooled four-stroke unit with an OHV formation for emission compliance, vibration and noise reduction, and improved fuel economy.

Honda’s intelligent Auto Choke Comfort System (ACS) ensures ultra-reliable ignition under all conditions; their high-specification Combustion Technology works to optimise power output, with the engine producing a substantial 4.2hp from a displacement of just 145cc.

The Mountfield SP51H 3-in-1 Petrol Lawnmower has been equipped with self-propulsion, so will prove a real boon if your lawn’s on a slope, or has sections of rough, bumpy grass.

Centralised height of cut adjustment makes what can be a troublesome process with lesser machines an easy one; larger-diameter drive wheels provide superior manoeuvrability, especially when working on long grass.

Supplied with mulch plug, a large 60-litre-capacity collector and a discharge chute, the Mountfield SP51H is capable of either bagging, recycling or rear-discharging your grass cuttings (the catcher has a dust and pollen retaining hard plastic top, and is made from canvas to save storage space).

The chassis on the Mountfield SP51H 3-in-1 Self-Propelled Petrol Lawnmower benefits from a powder-coated paint finish that’s both corrosion and scratch resistant.

Designed to perform quickly and efficiently across substantial areas, this model has an expansive 51cm working-width.

For four-stroke engine oil, click here.

Additional information



Engine Make


Engine Model

Honda GCVx145 OHV Engine

Engine Capacity


Engine Power

4.2hp / 3.1kW @ 3600rpm

Engine Starting System


Engine Fuel-Tank Capacity

0.91 Litres


Self-Propelled – 3.6km/h

Cutting Width


Cutting Heights

27-90mm (5 Positions)

Height Adjustment

Individual Levers

Grass Collector

60 Litres





Cutting Deck

Steel with Powder-Coated Paint Finish





Safety Features

Operator Presence Control

Lawn Size

Up to 2500m2

Product Weight



3 Years


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Shipping Info

Shipping Info

If you’re buying a boxed product, we aim to get your order delivered next working day – UK mainland where possible.

If you’re buying a tractor or ride-on mower – a special order item – it could be slightly longer, as we need to PDI the machine.

We do try and van-deliver these machines if we can, as this gives us a chance to demonstrate the product, and to ensure you’re happy and confident with your purchase.

If we can’t van-deliver your machine, as you’re out of our local delivery area, the tractor will be sent on a pallet via a courage company. They will then contact you directly to book a specific day and time that suits you.