Model # 421400-421499 (0012 - 0022) Official Briggs & Stratton gas engine

Here are the diagrams and repair parts for Official Briggs & Stratton 421400-421499-0012-0022 gas engine, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Screws

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#240

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Filter

Part #394358

Replaced by #394358S

$7.12 |

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#337

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Plug

Part #394539

Replaced by #796112S

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$5.24 |

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#883

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Gasket

Part #270917

Replaced by #692236

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#803A

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Hous. str

Part #392744

Replaced by #497595

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#535

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Element

Part #271271

Replaced by #272490S

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#24

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Flywheel key

Part #61760

Replaced by #222698S

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#783

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Starter gear

Part #280104

Replaced by #695708

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#474

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Stator

Part #393474

Replaced by #592831

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#635

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Elbow spacer plug

Part #66538

Replaced by #66538S

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Oil seal

Part #391086

Replaced by #391086S

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Symptoms for gas pressure washers

Choose a symptom to see related pressure washer repairs.

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Why does my pressure washer spray too hard?

Main causes: faulty unloader valve, bad pressure regulator…

Why won't my pressure washer engine start?

Main causes: stale fuel, gummed up carburetor, engine needs tune up, throttle and choke controls need adjustment, bad re…

Why does my pressure washer's engine lose power?

Main causes: dirty air filter, stale fuel, clogged or dirty carburetor, bad unloader valve…

Why won't the pressure washer starter rope retract?

Main causes: broken recoil spring, damaged recoil starter…

Why is smoke coming from the pressure washer's exhaust?

Main causes: overfilling engine with oil, improper fuel/air mixture, choke system problems, dirty carburetor, engine nee…

Why does water spray out of my pressure washer's pressure relief valve?

Main causes: pump running for more than 5 minutes when the spray wand isn't being used, faulty pressure relief valve, ba…

Why is the spray from my pressure washer weak?

Main causes: insufficient water supply, clogged water inlet screen, clogged pressure hose, faulty pump check valves, stu…

Why won't my pressure washer mix in the detergent?

Main causes: using a high-pressure spray tip when applying detergent, clogged siphon tube, chemical injection system fai…

Why doesn't my pressure washer recoil starter work?

Main causes: damaged recoil starter, oil inside cylinder, locked up engine piston…

Repair guides for gas pressure washers

These step-by-step repair guides will help you safely fix what’s broken on your pressure washer.

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How to install a pressure washer chemical injection kit

The chemical injection valve draws detergent into the pump. If it’s not drawing detergent, use a repair kit to replace t…

Repair difficulty

Time required

15 minutes or less

How to install a pressure washer O-ring kit

O-rings seal fittings on the pressure washer pump. Damaged seals allow water to leak from the pump. Follow these steps t…

Repair difficulty

Time required

45 minutes or less

How to replace a pressure washer pump

The pump can be damaged by air in the inlet water supply or by chemicals that remain in the pump body after using the ch…

Repair difficulty

Time required

15 minutes or less

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

Use the advice and tips in these articles and videos to get the most out of your pressure washer.

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Top questions about Sears and Sears PartsDirect

What are the main components of a lawn mower?

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

Model # 421400-421499 (0012 - 0022) Official Briggs & Stratton gas engine

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Symptoms for gas pressure washers

Why does my pressure washer spray too hard?

Why won't my pressure washer engine start?

Why does my pressure washer's engine lose power?

Why won't the pressure washer starter rope retract?

Why is smoke coming from the pressure washer's exhaust?

Why does water spray out of my pressure washer's pressure relief valve?

Why is the spray from my pressure washer weak?

Why won't my pressure washer mix in the detergent?

Why doesn't my pressure washer recoil starter work?

Repair guides for gas pressure washers

How to install a pressure washer chemical injection kit

How to install a pressure washer O-ring kit

How to replace a pressure washer pump

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

Top questions about Sears and Sears PartsDirect

What are the main components of a lawn mower?

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