Briggs & Stratton Engine Electric Start 21R8070062B5CC0001

Briggs & Stratton 21R8070062B5CC0001 | 3130 PowerBuilt™ OHV Vertical Crankshaft Engine (13HP)

The Briggs & Stratton 3130 PowerBuilt is a 13HP, 344cc single-cylinder petrol engine aimed squarely at ride-on mowers, lawn tractors and garden machinery that puts in regular work through the cutting season. With 9.9kW gross output and 22.75Nm of torque at 3600rpm, it has enough grunt for domestic mowing and light grounds maintenance without being oversized for the job.

OHV Design

The overhead valve layout positions the valves in the cylinder head rather than the block, which shortens the combustion path and improves thermal efficiency. In practical terms this means the engine uses less fuel for the same output and generates less heat at sustained running speeds — useful on a machine that may be covering large areas in a single session.

ReadyStart™ Automatic Choke

The ReadyStart system uses a temperature-sensing mechanism to automatically adjust the fuel-to-air mixture at the carburettor, removing the need to prime or manually set a choke before starting. It operates reliably between 0°C and 49°C, covering the range of temperatures you'd typically encounter during the UK mowing season.

Cast-Iron Cylinder Sleeve

The cylinder bore is lined with cast iron rather than left as bare aluminium. Cast iron holds its shape better under heat and repeated use, which keeps the bore round and the piston rings sealing properly over the long term. On a domestic machine that gets regular seasonal use rather than daily commercial work, this is what separates an engine that lasts a decade from one that doesn't.

Electric Start & 9-Amp Charging System

Turn the key and it starts. The electric starter is backed by a 9-amp charging system that tops the battery up during operation. This also means the system can comfortably handle the electrical draw from an electric PTO, headlights or any other 12V accessories the machine runs.

Built-In Fuel Pump

A mechanical fuel pump draws petrol from the machine's tank to the carburettor. On ride-on mowers the fuel tank sits remote from the engine rather than gravity-feeding it directly, so a pump is a standard requirement rather than an optional extra.

AVS® Anti-Vibration System

Single-cylinder engines produce more vibration than multi-cylinder units by nature of how they fire. The AVS system uses a counterbalancing mechanism to smooth this out, reducing what the operator feels through the seat and steering and lessening the fatigue on the machine's frame over time.

Fitment & Compatibility

The vertical crankshaft is 25.4mm (1 inch) in diameter and 80.19mm (3.15 inches) in length — a configuration used across a broad range of ride-on mower and lawn tractor brands. If you're unsure whether this engine suits your machine, contact us with your original engine's Model, Type and Code numbers and our staff will confirm compatibility.

Specifications

Series: 3130 PowerBuilt OHV

Cylinders: Single, Cast-Iron Sleeved

Displacement: 344cc

Power Output: 13HP / 9.9kW Gross (22.75Nm @ 3600rpm)

Fuel Type: Petrol

Cooling: Air-Cooled

Crankshaft: Vertical, 1" (25.4mm) diameter x 3.15" (80.19mm) length

Flywheel: Heavy

Top No-Load RPM: 3200 ±100

Charging System: 9 Amp

Choke: ReadyStart (Automatic)

Electric Start: Yes

Recoil Start: No

Fuel Pump: Yes

Oil Capacity: 1.42 litres (approx.)

No recoil start, oil filter, low oil cut-off, muffler or fuel tank included.
Power and torque figures stated gross per SAE J1940 as rated by Briggs & Stratton.

Always read the owner's manual before commissioning. Damage resulting from improper installation is not covered under warranty. Shipping restrictions may apply outside of the UK — please contact us to confirm.