Briggs & Stratton
Lawn & Garden Engine

Model # 121002-3423-H8 Official Briggs & Stratton engine

Here are the diagrams and repair parts for Official Briggs & Stratton 121002-3423-H8 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 151 parts  |

Lawn & Garden Equipment Engine Air Filter (replaces 17211-2l8-000, 1759330, 1904481, 491588, 491588ms, 494245, 6.491-338, 691710, Bs-491588s) 491588S

#445

All parts diagram

Lawn & garden equipment engine air filter (replaces 17211-2l8-000, 1759330, 1904481, 491588, 491588ms, 494245, 6.491-338, 691710, bs-491588s)

Part #491588S

BEST SELLER

Get free shipping with Automatic Reorder

$9.24
10% OFF Phone Price : $10.24
In Stock
Lawn & Garden Equipment Engine Recoil Starter Pawl Friction Plate (replaces 281503, Bs-692299) 692299

#456

All parts diagram

Lawn & garden equipment engine recoil starter pawl friction plate (replaces 281503, bs-692299)

Part #692299

This item is not returnable
$7.89
11% OFF Phone Price : $8.89
In Stock
Lawn & Garden Equipment Engine Fuel Shut-off Valve (replaces 692586, 698181) 698180

#958

All parts diagram

Lawn & garden equipment engine fuel shut-off valve (replaces 692586, 698181)

Part #698180

This item is not returnable
$19.94
9% OFF Phone Price : $21.94
In Stock
Lawn & Garden Equipment Engine Fuel Line 791867

#187A

All parts diagram

Lawn & garden equipment engine fuel line

Part #791867

This item is not returnable
$26.89
18% OFF Phone Price : $32.89
In Stock
Lawn & Garden Equipment Engine Oil Fill Cap (replaces 281658, 49-667, 66768, 692261, Bs-281658s) 281658S

#21

All parts diagram

Lawn & garden equipment engine oil fill cap (replaces 281658, 49-667, 66768, 692261, bs-281658s)

Part #281658S

This item is not returnable
$5.79
15% OFF Phone Price : $6.79
In Stock
Lawn & Garden Equipment Engine Spark Plug Wire Terminal (replaces 493880, 691234, Bs-493880s) 493880S

#851

All parts diagram

Lawn & garden equipment engine spark plug wire terminal (replaces 493880, 691234, bs-493880s)

Part #493880S

This item is not returnable
$4.75
17% OFF Phone Price : $5.75
In Stock
Lawn & Garden Equipment Engine Recoil Starter Friction Spring (replaces 263073, Bs-691855) 691855

#689

All parts diagram

Lawn & garden equipment engine recoil starter friction spring (replaces 263073, bs-691855)

Part #691855

This item is not returnable
$6.19
14% OFF Phone Price : $7.19
In Stock
Lawn & Garden Equipment Engine Intake Gasket 692555

#51

All parts diagram

Lawn & garden equipment engine intake gasket

Part #692555

This item is not returnable
$5.63
15% OFF Phone Price : $6.63
In Stock
Lawn & Garden Equipment Engine Ignition Coil (replaces 695711, Bs-796964) 796964

#333

All parts diagram

Lawn & garden equipment engine ignition coil (replaces 695711, bs-796964)

Part #796964

$67.19
8% OFF Phone Price : $73.19
In Stock
Lawn & Garden Equipment Engine Fuel Line Clamp 791850

#601

All parts diagram

Lawn & garden equipment engine fuel line clamp

Part #791850

This item is not returnable
$4.74
17% OFF Phone Price : $5.74
In Stock

Symptoms for gas ranges

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure...

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, control system failure, faulty t...

Repair guides for gas ranges

How to replace oven door hinges on a gas range

How to replace oven door hinges on a gas range

See how to replace the oven door hinges on a gas range yourself, in just 30 minutes....

Repair difficulty
Time required
15 minutes or less
How to replace a range spark igniter switch

How to replace a range spark igniter switch

Follow these steps to replace the spark igniter switch—sometimes called a burner switch or spark switch—on a gas or dual...

Repair difficulty
Time required
60 minutes or less
How to replace a range spark igniter electrode

How to replace a range spark igniter electrode

Learn how to replace the spark igniter electrode for the surface burners on a gas range or dual-fuel range....

Repair difficulty
Time required
45 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....