Petrol
STIHL-RM-4-RTP
Stihl

RM 4 RTP

"Rear-discharge Stihl with mulch kit — pro lawn care"

4.6 (54) · Value score: 7.9 / 10
RRP New
£1,899
Manufacturer
Buy Now
£1,799
Lowest UK retailer
Used Avg
£1,100
Facebook / eBay UK avg

Our verdict

The bottom line

A landscaper's tool, not a domestic mower. The Kawasaki FJ180V is the engine in serious commercial kit — bomb-proof but loud. Discharge-only suits big rough lawns where collection is impractical. Buy this only if you're mowing acres or doing it for money.

Pros & cons

Pros

  • Kawasaki commercial engine — pro-grade
  • Rear discharge handles tall grass
  • Self-propelled with hydrostatic-feel drive
  • Built for daily landscaping use

Cons

  • No grass collection (kit extra)
  • Eye-watering price for non-commercial buyers
  • Heavy and wide
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Full specs

TypePetrol
Cut width53 cm
Engine / PowerKawasaki FJ180V
Weight45 kg
DeckSteel
Self-propelledYes
Rear rollerNo
MulchingYes
Cutting heights6 positions
Bag capacity
Suited to lawnLarge
Noise level95 dB

Buying second-hand

Used-market tip

£800–1300 used. Kawasaki engine hours under 800 is good (these run for 2000+). Self-propel cable wear is the common fault. Look for a discharge chute that pivots cleanly — bent chutes are common from contractor abuse.

Where to look: Facebook Marketplace and Gumtree are usually 20–30% cheaper than eBay UK for petrol mowers because most sellers want local pickup. eBay tends to win on cordless and electric (lighter, easier to ship). Always insist on a starting demonstration before paying.

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