Briggs & Stratton
Lawn & Garden Engine

Model # 121S02-0120-F1 Official Briggs & Stratton engine

Here are the diagrams and repair parts for Official Briggs & Stratton 121S02-0120-F1 engine, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 127 parts  |

Lawn & Garden Equipment Engine Fuel Tank Cap (replaces 397974, 494277, 692041, 692046, 699985, 793606, Bs-692046, Bs-796577) 796577

#957

All parts diagram

Lawn & garden equipment engine fuel tank cap (replaces 397974, 494277, 692041, 692046, 699985, 793606, bs-692046, bs-796577)

Part #796577

BEST SELLER
$20.09
23% OFF Phone Price : $26.09
In Stock
Lawn & Garden Equipment Engine Spark Plug 692051

#337

All parts diagram

Lawn & garden equipment engine spark plug

Part #692051

BEST SELLER
$8.59
10% OFF Phone Price : $9.59
In Stock
Lawn & Garden Equipment Engine Flywheel Key (replaces 222698, 690974, Bs-222698s) 222698S

#24

All parts diagram

Lawn & garden equipment engine flywheel key (replaces 222698, 690974, bs-222698s)

Part #222698S

BEST SELLER
This item is not returnable
$3.29
23% OFF Phone Price : $4.29
In Stock
Lawn & Garden Equipment Engine Air Filter (replaces Bs-795066) 795066

#445

All parts diagram

Lawn & garden equipment engine air filter (replaces bs-795066)

Part #795066

BEST SELLER
$16.87
11% OFF Phone Price : $18.87
In Stock
Lawn & Garden Equipment Engine Recoil Starter Handle (replaces 281434, 691930, 795426, Bs-281434s) 281434S

#60

All parts diagram

Lawn & garden equipment engine recoil starter handle (replaces 281434, 691930, 795426, bs-281434s)

Part #281434S

BEST SELLER
This item is not returnable
$6.34
14% OFF Phone Price : $7.34
In Stock
Lawn & Garden Equipment Engine Carburetor Needle Valve (replaces 281144, 281178, Bs-398188) 398188

#134

All parts diagram

Lawn & garden equipment engine carburetor needle valve (replaces 281144, 281178, bs-398188)

Part #398188

This item is not returnable
$8.13
11% OFF Phone Price : $9.13
In Stock
Lawn & Garden Equipment Engine Spark Plug Boot (replaces 6001, 66538, 691210, Bs-66538s) 66538S

#635

All parts diagram

Lawn & garden equipment engine spark plug boot (replaces 6001, 66538, 691210, bs-66538s)

Part #66538S

This item is not returnable
$5.11
16% OFF Phone Price : $6.11
In Stock
Lawn & Garden Equipment Engine Carburetor Float Bowl Gasket 796610

#137

All parts diagram

Lawn & garden equipment engine carburetor float bowl gasket

Part #796610

This item is not returnable
$10.89
16% OFF Phone Price : $12.89
In Stock
Lawn & Garden Equipment Engine Carburetor Rebuild Kit 796612

#121

All parts diagram

Lawn & garden equipment engine carburetor rebuild kit

Part #796612

$45.40
12% OFF Phone Price : $51.40
In Stock
Lawn & Garden Equipment Engine Stop Switch (replaces 396847, Bs-692310) 692310

#621

All parts diagram

Lawn & garden equipment engine stop switch (replaces 396847, bs-692310)

Part #692310

This item is not returnable
$9.89
9% OFF Phone Price : $10.89
In Stock

Repair guides for electric wall ovens

How to replace a wall oven broil element

How to replace a wall oven broil element

Follow these step-by-step instructions to replace the broiler element in an electric oven....

Repair difficulty
Time required
15 minutes or less
How to replace a temperature sensor on an electric wall oven

How to replace a temperature sensor on an electric wall oven

These step-by-step instructions guide you through replacing a temperature sensing probe on an electric wall oven....

Repair difficulty
Time required
15 minutes or less
How to replace a wall oven hidden bake element

How to replace a wall oven hidden bake element

These step-by-step instructions guide you through replacing the hidden bake element....

Repair difficulty
Time required
30 minutes or less

Effective articles & videos to help repair your lawn & garden engines

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect....

What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts....