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How to find the right small engine part number

Small engine parts are sold by number. Find the engine's model number first, then the part number — and when both are gone, measure.

Honda GX and GCV

The engine type (GX160, GX390, GCV160) is cast or stamped on the crankcase; the serial and type code sit on a sticker or stamp near the oil fill. Carburetor numbers like 16100-ZH8 are on a tag under the bowl nut or on the body.

Briggs & Stratton

Model, type and code are stamped on the shroud, valve cover or a metal plate — for example 130G32-0001-H1. Gaskets and cables carry their own numbers: 796851, 690971, 691024.

Generators, mowers and snowblowers

The product identification label is on the frame, deck or handle. It gives the machine model, which leads to the engine and the part diagrams. Cables often have the number on a plastic sleeve: 532440934, 946-0957, 119-2379.

When the number is gone

• Carburetor: bore (19 or 27 mm), intake size, distance between mounting holes.
• Fuel line: inside diameter — 3/16 in, 1/4 in or 3/8 in.
• Cable: inner wire length, conduit length, end types.
• Exhaust gasket: pipe ID, number of bolts, bolt-to-bolt center.
• Pull start: engine size and pawl type.

Main parts that wear on a small engine

Air filter, spark plug, fuel line and filter, carburetor, starter rope and control cables. Keep those on the shelf and most breakdowns become a 20-minute repair.