Lawn & Garden Engine

Model # 251700 TO 251799 (0177 - 0177) Official Briggs & Stratton gas engine

Here are the diagrams and repair parts for Official Briggs & Stratton 251700 TO 251799 (0177 - 0177) gas engine, as well as links to manuals and error code tables, if available.

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251700 TO 251799 (0177 - 0177) Gas Engine
Spark Plug 298809

#337

All parts 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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$5.24
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Flywheel Key 61760

#24

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Flywheel key

Part #61760

Replaced by #222698S

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Manufacturer substitution
This part replaces 61760. Substitute parts can look different from the original.
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$3.29
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Gear 391764

#219

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Gear

Part #391764

Replaced by #691968

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Manufacturer substitution
This part replaces 391764. Substitute parts can look different from the original.
$44.07
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Oil Filter Plug 66768

#21

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Oil filter plug

Part #66768

Replaced by #281658S

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Manufacturer substitution
This part replaces 66768. Substitute parts can look different from the original.
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$5.79
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Clamp 93053

#601

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Clamp

Part #93053

Replaced by #791850

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Manufacturer substitution
This part replaces 93053. Substitute parts can look different from the original.
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$4.74
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Oil Plug 91084

#15

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Oil plug

Part #91084

Replaced by #690946

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Manufacturer substitution
This part replaces 91084. Substitute parts can look different from the original.
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$9.59
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Screw 93381

#334

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Screw

Part #93381

Replaced by #691061

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Manufacturer substitution
This part replaces 93381. Substitute parts can look different from the original.
This item is not returnable
$5.09
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Clutch-str. 392198

#66

All parts diagram

Clutch-str.

Part #392198

Replaced by #399671

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Manufacturer substitution
This part replaces 392198. Substitute parts can look different from the original.
$40.49
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Hex Nut 92284

#332

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Hex nut

Part #92284

Replaced by #690662

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Manufacturer substitution
This part replaces 92284. Substitute parts can look different from the original.
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$8.29
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Breather Tube 280100

#11

All parts diagram

Breather tube

Part #280100

Replaced by #692253

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Manufacturer substitution
This part replaces 280100. Substitute parts can look different from the original.
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$14.49
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Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

How to replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Repair difficulty
Time required
 45 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 walk-behind lawn mower.

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.…