Parts for 31P8770121E1 — Briggs & Stratton

We found 72 parts confirmed to fit the Briggs & Stratton 31P8770121E1.

Compatibility table

Prices shown are an informational reference range only, not an offer or an Amazon price — RepairKitHub does not sell parts directly. Each part links to an Amazon search so you can compare current listings yourself.

Common failure areas on this model

The confirmed parts above group into a handful of failure areas. Here is what each points to and how to check it before you order anything.

Storage, trim and cosmetic hardware

Symptom: A cracked shelf, broken door bin, worn hinge, or missing trim piece -- cosmetic and storage wear rather than a functional breakdown.

Check: Match the physical dimensions and mounting tabs of the old part before ordering; these pieces are often model-specific even between visually similar models.

Parts in this group on 31P877-0121-E1: 699986 (Briggs & Statton Lawn & Garden Equipment Engine Air Filter Cover), 791942 (Briggs & Statton Camshaft), 792022 (Briggs & Statton Lawn & Garden Equipment Engine Carburetor Fuel Pick-Up Tube), 697085 (Briggs & Statton Lawn & Garden Equipment Engine Oil Fill Tube), 790443 (Briggs & Stratton Dipstick/Tube Assy), 697419 (Briggs & Statton Lawn & Garden Equipment Engine Blower Housing Latch), 697561 (Briggs & Statton Screw), 699852 (Briggs & Statton Trim Plate), BS799370 (SCREW), 697104 (Briggs & Statton Lawn & Garden Equipment Engine Screw), 790832 (Briggs & Statton Lawn & Garden Equipment Engine Screw), 697157 (Briggs & Statton Lawn & Garden Equipment Engine Screw), 799370 (Briggs & Statton Lawn & Garden Equipment Engine Screw), 691032 (Briggs & Statton Lawn & Garden Equipment Engine Dipstick Tube Seal), 691148 (Briggs & Statton Lawn & Garden Equipment Engine Hex Screw), 695408 (Briggs & Statton Lawn & Garden Equipment Engine Idle Adjustment Screw), 690718 (Briggs & Statton Lawn & Garden Equipment Engine Self-Tapping Screw), 596718 (Briggs & Statton Lawn & Garden Equipment Engine Screw), 691031 (Briggs & Statton Lawn & Garden Equipment Engine Dipstick Tube O-Ring, Upper).

General hardware and mounting parts

Symptom: A small mechanical or mounting part has failed, cracked, or gone missing.

Check: Compare the physical shape and mounting points to the original piece, and confirm the exact part number against your model plate before ordering.

Parts in this group on 31P877-0121-E1: 697090 (Briggs & Statton Lawn & Garden Equipment Engine Fuel Pump Assembly), 699458 (Briggs & Statton Lawn & Garden Equipment Engine Carburetor High-Altitude Jet), 699500 (Briggs & Statton Valve), 697100 (Briggs & Statton Lawn & Garden Equipment Engine Piston Pin Lock), 792649 (Briggs & Statton Lawn & Garden Equipment Engine Piston Ring Set,0.02-In), 794360 (Briggs & Statton Lawn & Garden Equipment Engine Voltage Regulator), BS594593 (CARBURETOR), 694476 (BEARING, GUIDE), 792296 (Briggs & Statton Lawn & Garden Equipment Engine Main Jet), 697099 (Briggs & Statton Lawn & Garden Equipment Engine Piston Pin), 692424 (Briggs & Statton Lawn & Garden Equipment Engine Spark Plug Wire Terminal), 698138 (Briggs & Statton Lock-Piston Pin (Green)(Used Before Code Date02100400).), BS795115 (Lawn & Garden Equipment Engine Air Filter), 697392 (Briggs & Statton Lawn & Garden Equipment Engine Crankshaft Counterweight Pin), 697123 (Briggs & Statton Lawn & Garden Equipment Engine Intake Elbow O-Ring Seal), 697122 (Briggs & Statton Lawn & Garden Equipment Engine Intake Pipe), 594437 (Briggs & Statton Lawn & Garden Equipment Engine Piston Ring Set), 272147 (Briggs & Statton Lawn & Garden Equipment Engine Repair Manual), 698779 (Briggs & Statton Seal), 791805 (Briggs & Stratton Lawn & Garden Equipment Engine Fuel Line), 692138 (Briggs & Statton Lawn & Garden Equipment Engine O-Ring), 794644 (Briggs & Statton Lawn & Garden Equipment Engine Oil Pump Kit), 594539 (Briggs & Statton Lawn & Garden Equipment Engine Piston And Ring Kit), 594540 (Briggs & Statton Lawn & Garden Equipment Engine Piston Assembly), 690727 (Briggs & Statton Lawn & Garden Equipment Engine Welch Plug), 795115 (Briggs & Stratton Lawn & Garden Equipment Engine Air Filter), 792171 (Briggs & Statton Carburetor), 690998 (Briggs & Statton Lawn & Garden Equipment Engine Choke Shaft Seal), 794903 (Briggs & Statton Lawn & Garden Equipment Engine Oil Drain Plug), 696136 (Briggs & Statton Lawn & Garden Equipment Engine Carburetor Needle Valve), 699908 (Briggs & Statton Lawn & Garden Equipment Engine Dipstick), 690589 (Briggs & Statton Lawn & Garden Equipment Engine O-Ring), 697128 (Briggs & Statton Lawn & Garden Equipment Engine Timing Gear), 593935 (Briggs & Statton Lawn & Garden Equipment Engine Starter Pinion Gear).

Controls, timers and wiring

Symptom: A cycle that doesn't advance, an unresponsive display, or the unit not starting at all.

Check: Look for burn marks or a burnt smell near the board or terminals, and check whether buttons and knobs respond -- a unit that powers on but won't cycle often traces back to this group.

Parts in this group on 31P877-0121-E1: BS694914 (Carburetor Float), BS695407 (SCREW (FLOAT BOWL)), 699502 (Briggs & Statton Lawn & Garden Equipment Engine Float Bowl), 694914 (Briggs & Stratton Lawn & Garden Equipment Engine Carburetor Float).

Door and drum seals

Symptom: A door or drum seal that has lost its grip, letting water or conditioned air escape past it.

Check: Inspect the seal for tears, flattening, or gaps, and check it against your model's part number before ordering.

Parts in this group on 31P877-0121-E1: 697109 (Briggs & Statton Lawn & Garden Equipment Engine Breather Gasket), 794114 (Briggs & Stratton Lawn and Garden Equipment Engine Cylinder Head Gasket), 692137 (Briggs & Stratton Lawn & Garden Equipment Engine Intake Gasket).

Before you buy

Match 31P8770121E1 exactly against the model and serial plate on the appliance itself before ordering anything — a single mismatched character can point to a different production run with different parts. Then check the part number printed or stamped on the part you are replacing against the part numbers in the table above; the printed number is the most reliable way to confirm fitment when a model has gone through multiple production runs. RepairKitHub does not sell parts directly — every part link above routes to an Amazon search for that part number so you can compare current listings and sellers yourself.

How to confirm this is your model

Check inside a door opening, on a back or side panel, or behind a removable panel or drawer for a label printed with the model and serial number. Match every character exactly, including letters and dashes at the end — appliance model numbers often have similar prefixes but different suffixes for different production runs.

Still not sure?

Use the model lookup tool to search by model or part number, or start from the symptom your appliance is showing.