Briggs & Stratton 21A900 697377, 23A 693555, 399265, K391086S, Note, 697106, 697188, 792305, 16A

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21A900

REF.

PART

 

REF.

PART

 

REF.

PART

 

NO.

NO.

DESCRIPTION

NO.

NO.

DESCRIPTION

NO.

NO.

DESCRIPTION

1

697377

Cylinder Assembly

11

794683

Tube−Breather

23A

693555

Flywheel

2

399265

Kit−Bushing/Seal

 

 

(Used After Code Date

 

 

(Rewind Starter)

 

 

(Magneto Side)

 

 

07071800).

 

 

Used on Type No(s).

3 K391086S

Seal−Oil

 

 

−−−−−− Note −−−−−−

 

 

0117, 0134, 0139,

 

 

(Magneto Side)

 

 

697113 Tube−Breather

 

 

0141, 0142, 0149,

4

697106

Sump−Engine

 

 

(Used Before Code

 

 

0151, 0161, 0166,

 

 

(Used After Code Date

 

 

Date 07071900).

 

 

0168, 0170, 0171,

 

 

05100200).

12

K697110

Gasket−Crankcase

 

 

0184, 0188, 0190.

 

 

−−−−−− Note −−−−−−

 

 

−−−−−− Note −−−−−−

 

 

 

 

(.015” Thick)

 

 

 

 

795940 Sump−Engine

 

 

 

 

698283 Flywheel

 

 

 

 

(Standard)

 

 

 

 

(Used Before Code

 

 

 

 

(Rewind Starter)

 

 

13

690360

Screw

 

 

 

 

Date 05100200).

 

 

Used on Type No(s).

 

 

 

 

(Cylinder Head)

 

 

 

 

Must Use Kit 795940,

 

 

 

 

0127, 0134, 0136,

 

 

14

790560

Stud

 

 

 

 

Includes Sump And

 

 

0138, 0144.

 

 

 

 

(Cylinder Head)

 

 

 

 

Counterweight.

 

 

24

222698S

Key−Flywheel

 

 

15

690946

Plug−Oil Drain

4A

697188

Sump−Engine

25

792305

Piston Assembly

 

 

(3/8” Standard)

 

 

(Used After Code Date

 

 

 

 

(Standard)

 

 

16A

697390

Crankshaft

 

 

 

 

05100200).

 

 

−−−−−− Note −−−−−−

 

 

20

K791892

Seal−Oil

 

 

 

 

Used on Type No(s).

 

 

792728 Piston

 

 

 

 

(PTO Side)

 

 

 

 

0101, 0105, 0115,

 

 

 

 

Assembly

 

 

22

692125

Screw

 

 

 

 

0119, 0121, 0122,

 

 

(.020” Oversize)

 

 

0129, 0156, 0157,

 

 

(Crankcase

26

792306

Ring Set

 

 

0165, 0172, 0173,

 

 

Cover/Sump)

 

 

(Standard)

 

 

0176, 0178, 0179,

23

693556

Flywheel

 

 

−−−−−− Note −−−−−−

 

 

0180, 0186, 0187,

 

 

Used on Type No(s).

 

 

792643 Ring Set

 

 

0188, 0189, 0190,

 

 

0115, 0137, 0157,

 

 

(.020” Oversize)

 

 

0191, 0192, 0195,

 

 

0192.

27

698469

Lock−Piston Pin

 

 

0197, 0198, 0199.

 

 

−−−−−− Note −−−−−−

 

 

(Used After Code Date

 

 

−−−−−− Note −−−−−−

 

 

693557 Flywheel

 

 

02100300).

 

 

795957 Sump−Engine

 

 

Used on Type No(s).

 

 

−−−−−− Note −−−−−−

 

 

(Used Before Code

 

 

0145, 0147, 0150,

 

 

698138 Lock−Piston

 

 

Date 05100200).

 

 

0159, 0176, 0191.

 

 

Pin

 

 

Used on Type No(s).

 

 

698281 Flywheel

 

 

(Used Before Code

 

 

0101, 0105, 0115,

 

 

Used on Type No(s).

28

697099

Date 02100400).

 

 

0119, 0121, 0122,

 

 

0101, 0104, 0105,

Pin−Piston

 

 

0129, 0156, 0157,

 

 

29

791633

Rod−Connecting

 

 

 

 

0119, 0120, 0121,

 

 

0165, 0172, 0173,

 

 

 

 

(Standard)

 

 

 

 

0122, 0123, 0124,

 

 

 

 

0176, 0178, 0179,

 

 

 

 

−−−−−− Note −−−−−−

 

 

 

 

0125, 0128, 0129,

 

 

 

 

0180, 0186, 0187,

 

 

 

 

697262 Rod−

 

 

 

 

0131, 0140, 0143,

 

 

 

 

0188, 0189, 0190,

 

 

 

 

Connecting

 

 

 

 

0152, 0153, 0155,

 

 

 

 

0191, 0192, 0195,

 

 

 

 

(.020” Undersize)

 

 

 

 

0158, 0162, 0164,

 

 

 

 

0197, 0198, 0199.

 

 

 

 

(Used Before Code

 

 

 

 

0169, 0172, 0173,

 

 

 

 

Must Use Kit 795957,

 

 

 

 

Date 05040400).

 

 

 

 

0178, 0183, 0185,

 

 

 

 

Includes Sump And

 

 

32

791118

Screw

 

 

 

 

0186, 0187.

 

 

Counterweight.

 

 

 

 

(Connecting Rod)

 

 

 

 

698282 Flywheel

 

 

5

792964

Head−Cylinder

 

 

33

695760

Valve−Exhaust

 

 

Used on Type No(s).

7KΔ273280S

Gasket−Cylinder Head

 

 

34

695761

Valve−Intake

9

K697109

Gasket−Breather

 

 

0113, 0133, 0154,

35

691279

Spring−Valve

 

 

(Used Before Code

 

 

0156, 0165, 0167,

 

 

(Intake)

 

 

Date 07071900).

 

 

0179, 0180, 0189,

 

 

 

 

 

(After Date Code Use

 

 

0195, 0197, 0198,

 

 

 

 

 

Liquid Sealant

 

 

0199.

 

 

 

 

 

Reference 850)

 

 

790924 Flywheel

 

 

 

10

697157

Screw

 

 

Used on Type No(s).

 

 

 

 

 

(Breather Assembly)

 

 

0113, 0156, 0167.

 

 

 

 

 

 

 

 

 

 

 

 

KIncluded in Engine Gasket Set−Ref. No. 358.

DIncluded in Carburetor Overhaul Kit−Ref. No. 121 or 121A.

zIncluded in Carburetor Gasket Set−Ref. No. 977 or 977A. Δ Included in Valve Gasket Set−Ref. No. 1095.

Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.

5069−11

Assemblies include all parts shown in frames.

02/07/2008

11

Page 10 Page 12
Image 11
Page 10 Page 12
Contents Illustrated Parts List With warning labels affixed 847 Valve Gasket SET See text WalbroNikki Emissions Label 1070 1005B 37A 187 187A 601 240 For additional information K391086S 69737723A 693555 39926578A 690364 691003121 790031 697352202 137Dz281165S192 216 691840267 794904 265 691024311 497608 387A 808656524 474C 696457523 699908 584 794682758 676 393761757 843 697158691956 398661968 697420 1040 698368−−−−−− Note −−−−−− 1319 794467 1263 6971241270 697156 1264 697104

21A900 specifications

Briggs & Stratton is a name synonymous with reliability and innovation in the small engine industry. Among its varied product lineup, the Briggs & Stratton 21A900 stands out for its performance and efficiency, making it an excellent choice for both homeowners and professionals.

The Briggs & Stratton 21A900 is a versatile engine specifically designed for lawn mowers and other outdoor power equipment. One of its hallmark features is its compact design, making it lightweight while still delivering robust performance. This makes it an ideal choice for residential lawn care, as well as for commercial landscaping operations.

One of the key technologies employed in the 21A900 is the Overhead Valve (OHV) design. This technology enhances engine efficiency by placing the valves in the cylinder head, allowing for better airflow and improved combustion. This results in increased power output and fuel efficiency, making it eco-friendlier compared to older engine designs.

In addition, the engine is equipped with a reliable starter mechanism, which enables easy starts even in cold conditions. The ReadyStart® system is a notable feature that eliminates the need for manual priming or choking, ensuring that users can get to work with minimal fuss.

The 21A900 also boasts a governor system designed to maintain engine speed under varying loads. This is particularly beneficial for lawn mowers, as it allows the engine to adjust power output automatically when encountering tougher grass or uneven terrain. As a result, users can enjoy consistent performance without constantly adjusting the throttle.

Durability is another significant characteristic of the 21A900. Briggs & Stratton engines are known for their rugged construction and the 21A900 is no exception. Built with high-quality materials, it promises long-lasting performance and reduced maintenance issues, which translates to lower total cost of ownership for users.

Maintenance is made easier with the inclusion of features such as a top-mounted oil fill and a convenient oil drain. This user-friendly design simplifies routine oil checks and changes, ensuring that the engine stays in top shape.

In summary, the Briggs & Stratton 21A900 engine combines advanced technologies, user-friendly features, and durable construction to deliver a powerful and efficient solution for outdoor power equipment. Whether used in a residential or commercial setting, the 21A900 ensures reliable performance for all lawn care needs. This engine exemplifies the commitment of Briggs & Stratton to quality and innovation, making it a trusted choice for users around the world.
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