Briggs & Stratton 21A900 service manual Illustrated Parts List

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FORM MS−5069−06/17/2008

REPLACES FORM MS−5069−02/07/08

FILE IN SECT. 2 OF SERVICE MANUAL

21A900

Illustrated Parts List

Model Series

21A900

TYPE NUMBERS 0101 through 0199.

TABLE OF CONTENTS

Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . 7

Alternator . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Blower Housing . . . . . . . . . . . . . . . . . . . . . 7

Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . 5, 6

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . 3

Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Cylinder Head . . . . . . . . . . . . . . . . . . . . . . 4

Electric Starter . . . . . . . . . . . . . . . . . . . . . . 8

Engine Sump . . . . . . . . . . . . . . . . . . . . . . . 2

Exhaust System . . . . . . . . . . . . . . . . . . . . 7

Flywheel . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Fuel Supply . . . . . . . . . . . . . . . . . . . . . . . . . 9

Gasket Set − Engine . . . . . . . . . . . . . . . . . 4

Gasket Set − Valve . . . . . . . . . . . . . . . . . . 4

Governor Spring . . . . . . . . . . . . . . . . . . . . 9

Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Intake Manifold . . . . . . . . . . . . . . . . . . . . . 4

Kit − Carburetor Overhaul . . . . . . . . . . . . 5

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . 3

Operator’s Manual . . . . . . . . . . . . . . . . . . 2

Piston, Rings, Connecting Rod . . . . . . . 3

Rewind Starter . . . . . . . . . . . . . . . . . . . . . . 8

Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Warning Label . . . . . . . . . . . . . . . . . . . . . . 2

PRINTED IN U.S.A.

COPYRIGHT by BRIGGS & STRATTON CORPORATION

All rights reserved. No part of this material may be reproduced or transmitted, in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without permission in writing from Briggs & Stratton Corporation.

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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 23A 693555 697377399265 K391086S121 790031 691003697352 78A 690364192 137Dz281165S216 691840 202311 497608 265 691024387A 808656 267 794904523 699908 474C 696457584 794682 524757 676 393761843 697158 758968 697420 3986611040 698368 6919561270 697156 1263 6971241264 697104 −−−−−− Note −−−−−− 1319 794467

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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