Our verdict
The smart Mountfield for buyers who want longevity over self-propel. The steel deck is the killer feature — a plastic-decked SP46 will warp after a few years; this S42PD will still be cutting in 20. Buy if you have a flat lawn and a dry shed.
Pros & cons
Pros
- Steel deck unusual at this price — outlasts plastic
- Stiga engine — proper Mountfield reliability
- Mulch plug as standard
- Push-only means simpler service
Cons
- Push-only on a 28kg machine is hard work on slopes
- 42cm narrower than the SP46
- Steel deck rusts if stored damp
Full specs
| Type | Petrol |
|---|---|
| Cut width | 42 cm |
| Engine / Power | Stiga ST120 OHV 123cc |
| Weight | 28 kg |
| Deck | Steel |
| Self-propelled | No |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 55 L |
| Suited to lawn | Medium |
| Noise level | 95 dB |
Buying second-hand
£70–130 used. Steel deck rust is the make-or-break — flip and look for hole-through corrosion (not just surface rust). Engine checks same as any Stiga: dipstick golden, fires cold. Anything stored under cover is a buy; anything left outside, walk away.
Where to buy the Mountfield S42PD
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Repair-cost reference
UK 2026 ballpark prices for the parts you're most likely to need on this mower. OEM is dealer-genuine; aftermarket is what you'll find on eBay or generic small-engine suppliers. Use these to sense-check any quote and to negotiate on used buys.
| Part / job | OEM | Aftermarket |
|---|---|---|
|
Replacement 42cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Foam air filter
|
£10 | £3 |
|
Spark plug
|
£8 | £3 |
|
Carburettor service kit
|
£25 | £10 |
Fair-offer calculator
Tell us about a specific used listing for the Mountfield S42PD you're looking at. We'll compute a fair offer range from our used-market data and the condition signals you provide.
Calculations are guidance, not gospel. Used-market prices vary by region (Scotland is typically 10–15% cheaper than the South-East), season (October cheapest, March most expensive), and seller motivation.
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