Small Engine

Briggs & Stratton 725EXi Series

4-Stroke

The Briggs & Stratton 725EXi is a 224cc  4-stroke overhead-valve engine in B&S's premium consumer push mower lineup. The EXi series features ReadyStart, a cyclonic air filtration system that extends air filter service intervals, and quieter operation. It uses a Walbro or Nikki carburetor  and a Champion RC12YC spark plug. The 725EXi handles demanding residential cutting including thick turf, wet grass, and bagging. Annual maintenance: oil change (SAE 10W-30 recommended for EXi models), air filter, and spark plug inspection or replacement.

Equipment: Small Engine · 4-Stroke
Covered Parts: Spark Plug, Air Filter, Carburetor, Primer Bulb, Fuel Filter
OEM References: 5
Model Family: 725EXi Series, 850EXi Series

ℹ See also: 850EXi Series — parts are often interchangeable within this family.

Spark Plug

OEM796112S(0.030" gap)Powers self-propelled and push mowers including Troy-Bilt TB230, Craftsman M230, and Husqvarna LC221A with 163cc engines

Brand	Part #
Champion	RC12YC	Buy on Amazon →
NGK	BPR5ES	Buy on Amazon →

Air Filter

OEM593260Paper cartridge element; replaces 798452 and 334404. Fits 09P702 series 163cc engines. Pre-cleaner foam sold separately.

Brand	Part #
Stens	100-959	Buy on Amazon →

Carburetor

OEM799584For 09P702 series 163cc engines. Also replaces 592361, 594057, 594058, 594529. Used on Troy-Bilt TB230 and similar.

Brand	Part #
Briggs & Stratton	594058	Buy on Amazon →

Primer Bulb

OEM694394Fits all 450–725 series Briggs & Stratton small engines. DIY packaged version is 5084K.

Brand	Part #
Stens	120-730	Buy on Amazon →

Fuel Filter

OEM298090S150-micron inline fuel filter for 1/4" fuel line; for engines without a fuel pump. DIY packaged version is 5018K.

Brand	Part #
Stens	120-436	Buy on Amazon →

Briggs & Stratton 725EXi Series