Masport 450ST SP Instart 18" Self-Propelled Electric Start Petrol Rotary Mower
Starting a petrol mower shouldn't be a workout — and the 450ST SP Instart removes that entirely. The Briggs & Stratton 475 ISI 140cc engine with Instart technology fires up with a simple turn of the key, no pull cord required. For anyone who finds recoil starting difficult, or simply wants to get mowing without any fuss, it's a genuinely useful feature that removes one of the main frustrations with petrol garden machinery.
Once running, the self-propelled drive takes over and the Quadcut four-blade disc system delivers a clean, consistent finish across the full 46cm cutting width. The four-blade design cuts each strip of grass multiple times per pass, which is particularly noticeable on longer or thicker grass where a single blade leaves a less even result. The Handle Lift System raises the handlebars to allow the machine to be tipped back for transport and storage without losing the grass catcher, which is a small but practical convenience.
The 46-litre catcher is well sized for the cutting width, the single lever height adjustment covers 14-45mm, and cam-lock folding handlebars keep storage compact. A straightforward, well-specified machine for anyone who wants petrol performance without the manual starting process.
Key Specifications
| Feature | Detail |
|---|---|
| Engine | 140cc Briggs & Stratton 475 ISI |
| Start System | Instart (electric key start) |
| Cutting Width | 46cm / 18" |
| Deck Material | Steel |
| Blade System | Quadcut 4-blade disc |
| Cutting Height | 14–45mm (single lever) |
| Drive | Self-propelled |
| Grass Catcher | 46 litres |
| Cutting Modes | Collect, mulch |
| Handlebar | Folding cam-lock with Handle Lift System |
| Weight | 35kg |
