Briggs & Stratton 15.5HP Lawnmower Engine (Intek EX1550 Series)
Brand: Briggs & Stratton
SKU: 31R777-0030
Size: Vertical Shaft
$1,365.00
Availability: Available
| Overhead Valve (OHV) Design | OHV configuration runs cooler and cleaner than conventional engines, delivering improved fuel economy and a longer service life. |
|---|---|
| Electric Start with Recoil Backup | Key-start electric starter for fast, effortless starting, with a backup recoil starter to ensure you're never left stranded. |
| Cast Iron Cylinder Bore | Cast iron bore provides superior wear resistance and oil control compared to aluminium alternatives for a longer engine lifespan. |
| Super Quiet Muffler | Included Super Quiet muffler significantly reduces operating noise for a more comfortable mowing experience — ready to fit straight out of the box. |
| Heavy-Duty Sleeve Bearings | Robust sleeve bearings reduce internal wear under sustained load, contributing to smoother operation and extended durability. |
| Automotive-Style Dipstick | Easy-read automotive-style dipstick makes checking and maintaining correct oil levels quick and straightforward between services. |
| Engine | 31R777 |
|---|---|
| Series | Briggs & Stratton Intek Series |
| Displacement | 500cc |
| Power output | 15.5hp |
| Engine type | 4-cycle OHV |
| Cylinders | 1 |
| Cooling system | Air cooled |
| Shaft orientation | Vertical |
| Dimensions (L × W × H) | 479 × 393 × 327 mm |
| Dry Weight | 30kg |
| Shaft type | Straight keyway |
| Shaft diameter | 1 inch (25.4 mm) |
| Shaft length | 3-5/32 inches (80.2 mm) |
| Keyway width | 1/4 inch (6.35 mm) |
| Oil capacity | 1.35 litres |
|---|---|
| Oil filter | Yes |
| Oil level indicator | Automotive-style dipstick |
| Air cleaner | Dual-element |
| Muffler | Included (Super Quiet) |
| Fuel tank | Not included |



