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Briggs & Stratton
Lawn & Garden Engine

Model # 121700 TO 121799 (3153,3154,3158) Official Briggs & Stratton engine

Here are the diagrams and repair parts for Official Briggs & Stratton 121700-TO-121799-315331543158 engine, as well as links to manuals and error code tables, if available.

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

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Model diagram and schematic

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Showing 10 of 291 parts  |
Carburetor 490937
#977

Gasket set/carburetor kit diagram

Carburetor

Part #490937

Replaced by #498260

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Manufacturer substitution
This part replaces 490937. Substitute parts can look different from the original.
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$25.25 | 
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Carburetor Kit 493762
#121

Gasket set/carburetor kit diagram

Carburetor kit

Part #493762

Replaced by #498260

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Manufacturer substitution
This part replaces 493762. Substitute parts can look different from the original.
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Carburetor 492495
#121A

Gasket set/carburetor kit diagram

Carburetor

Part #492495

Replaced by #498260

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Manufacturer substitution
This part replaces 492495. Substitute parts can look different from the original.
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Carburetor Primer 496115
#387

Filter/base - air cleaner diagram

Carburetor primer

Part #496115

Replaced by #694395

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Manufacturer substitution
This part replaces 496115. Substitute parts can look different from the original.
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This item is not returnable
$5.40 | 
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Fuel Cap 397974
#957

Seal, o-ring/lin-fuel diagram

Fuel cap

Part #397974

Replaced by #796577

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Manufacturer substitution
This part replaces 397974. Substitute parts can look different from the original.
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Fuel Tank Cap 493017
#957A

Seal, o-ring/lin-fuel diagram

Fuel tank cap

Part #493017

Replaced by #796577

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Manufacturer substitution
This part replaces 493017. Substitute parts can look different from the original.
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Fuel Tank Cap 494277
#957B

Seal, o-ring/lin-fuel diagram

Fuel tank cap

Part #494277

Replaced by #796577

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Manufacturer substitution
This part replaces 494277. Substitute parts can look different from the original.
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Spark Plug 293918
#337B

Cylinder/intake - manifold diagram

Spark plug

Part #293918

Replaced by #796112S

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Manufacturer substitution
This part replaces 293918. Substitute parts can look different from the original.
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$5.24 | 
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Spark Plug 298809
#337

Cylinder/intake - manifold diagram

Spark plug

Part #298809

Replaced by #796112S

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Manufacturer substitution
This part replaces 298809. Substitute parts can look different from the original.
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Fuel Pipe 492790
#187

Seal, o-ring/lin-fuel diagram

Fuel pipe

Part #492790

Replaced by #791766

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Manufacturer substitution
This part replaces 492790. Substitute parts can look different from the original.
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