Parts for 4077770121E1 — Briggs & Stratton
We found 25 parts confirmed to fit the Briggs & Stratton 4077770121E1.
Same parts list as 4077770119E3 (Briggs & Stratton). 4077770121E1 shares an identical confirmed parts list with 4077770119E3 (Briggs & Stratton). That page is the canonical version of this parts list — use it if you want the primary reference, or stay here since the list below is exactly the same for 4077770121E1.
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.
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 407777-0121-E1: 691016 (Briggs & Statton Pre-Cleaner), 691007 (Briggs & Statton Air Filter), 690974 (Briggs & Statton Flywheel Key), 499607 (Briggs & Statton Ring Set .03), 691208 (Briggs & Statton Wire), 691020 (Briggs & Statton Throttle Link), 690986 (Briggs & Statton Choke Valve), 690232 (Briggs & Statton Lawn & Garden Equipment Engine Carburetor Main Jet), 690996 (Briggs & Statton Lawn & Garden Equipment Engine Fuel Shut-Off Solenoid Retainer), 499808 (Briggs & Stratton Nozzle-Carburetor), 691034 (Briggs & Statton Fuel Pump), 499807 (Briggs & Statton Lawn & Garden Equipment Engine Choke Shaft Kit), 690238 (Briggs & Statton Hex Nut), 690987 (Briggs & Statton Lawn & Garden Equipment Engine Solenoid Retainer Seal O-Ring), 499809 (Briggs & Statton Solenoid), 693058 (Briggs & Statton Starter Gear), 691035 (Briggs & Statton Lawn & Garden Equipment Engine Inline Fuel Filter), 691050 (Briggs & Statton Fuel Line (Red)), 691043 (Briggs & Statton Lawn & Garden Equipment Engine Spark Plug).
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 407777-0121-E1: 691004 (Briggs & Statton Blower Housing), 690952 (Briggs & Statton Carburetor Spacer), 691018 (Briggs & Statton Lawn & Garden Equipment Engine Governor Spring), 690989 (Screw).
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 407777-0121-E1: 691220 (Briggs & Statton Lawn & Garden Equipment Engine Wire Harness).
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 407777-0121-E1: 690971 (Briggs & Stratton Lawn & Garden Equipment Engine Rocker Arm Cover Gasket).
Before you buy
Match 4077770121E1 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.