Our verdict
The Honda-engined SP46 is the bargain that nobody talks about. You get Honda longevity on a chassis with massive parts supply — and Mountfield resale economics. A used Honda HRX is £550. A used SP46H is £220. Same engine reliability for less than half the price.
Pros & cons
Pros
- Honda GCV engine on a Mountfield body — best of both
- Significantly more reliable than the standard SP46
- Same parts/dealer support as the regular SP46
- Self-propelled, mulch plug, the works
Cons
- £100 more new than the standard SP46
- Honda engine adds about 3kg
- Used supply thinner than the rope-start variant
Full specs
| Type | Petrol |
|---|---|
| Cut width | 46 cm |
| Engine / Power | Honda GCV 145 OHC 145cc |
| Weight | 30 kg |
| Deck | Steel |
| Self-propelled | Yes |
| Rear roller | No |
| Mulching | Yes |
| Cutting heights | 6 positions |
| Bag capacity | 55 L |
| Suited to lawn | Medium |
| Noise level | 95 dB |
Buying second-hand
£170–280 used. Always confirm the Honda decals are genuine (Mountfield also sold a Briggs version called SP46B — different beast). Check the GCV engine number on the side cover. Honda-engined Mountfields are reliable and underpriced — an absolute value buy.
Where to buy the Mountfield SP46H
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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 46cm blade
Annual sharpening is free; replace when bent or cracked.
|
£24–£32 | £8–£12 |
|
Genuine Honda foam air filter
|
£18 | £8 |
|
NGK spark plug BPR6ES
|
£14 | £5 |
|
Cam belt (genuine Honda)
|
£35 | £18 |
|
Drive cable replacement
Stretches at 5–8 years. 30-minute DIY fit.
|
£18–£28 | £8 |
Fair-offer calculator
Tell us about a specific used listing for the Mountfield SP46H 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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