Briggs & Stratton 21B900 Series Setup guide
Not for
Reproduction
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.
PRINTED IN U.S.A.
FORM MS--5036--03/23/2009
REPLACES FORM MS--5036--06/18/2008
FILE IN SECT. 2 OF SERVICE MANUAL
21B900
Illustrated Parts List
Model Series
21B900
TYPE NUMBERS
0015 through 0206.
TABLE OF CONTENTS
Air Cleaner 6.........................
Alternator 9..........................
Blower Housing 6.....................
Camshaft 3...........................
Carburetor 5..........................
Controls 8............................
Crankshaft 3..........................
Cylinder 2............................
Cylinder Head 4.......................
Electric Starter 7......................
Engine Sump 2.......................
Fuel Supply 8.........................
Flywheel 7............................
Gasket Set -- Engine 4.................
Gasket Set -- Valve 4..................
Governor Spring 8....................
Exhaust System 6.....................
Ignition 8.............................
Intake Manifold 4.....................
Kit -- Carburetor Overhaul 5............
Lubrication 3.........................
Operator’s Manual 2..................
Piston, Rings, Connecting Rod 3.......
Rewind Starter 7......................
Valves 4..............................
Warning Label 2......................
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--2 Assemblies include all parts shown in frames. 03/23/2009
2
12
20
4
750
943
965
1024A
307
306
691
718
552
2
10
9
584
11
1263
1264
1
1027
22
15
4A
12
20
1017
415
239
1058 OPERATOR’S MANUAL 1319 WARNING LABEL
REQUIRED when replacing parts
with warning labels affixed.
850
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--3 Assemblies include all parts shown in frames. 03/23/2009
3
26
27
27
32
24
842
524
847
523
525
741
146
29
28
25
16
43
357
46
45
1270
757
758
759
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--4 Assemblies include all parts shown in frames. 03/23/2009
4
42
53
654
635
13
830
1034
1022
883
7
238
36 868
35
1022
1023
914
383
5
192
34
1029
45
1026
42
42
33
337
14
705
617 51
850 51A
51
54
617
50
51A
186
415
1022
12
9
7
3
358 ENGINE GASKET SET
868
691
524 51
20
617
883 1266
842 1266A
51A
943
1022
868
51
1095 VALVE GASKET SET
7
883
51A
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--5 Assemblies include all parts shown in frames. 03/23/2009
5
950
276
137
104
105
142 1091
51
93
987
95
130
LMT / PART
NUMBER
LOCATIONS 106
131
98
94
133
975
WALBRO
143
127
634 108
141
95
104
105
106
137
142
987
127
634
276
93
51
121 CARBURETOR OVERHAUL KIT
977 CARBURETOR GASKET SET
51 137 276
1266
1266A
617
276A
118
1091
1127
104A
105A
51
987A
95A
130A
NIKKI
98A
133A
94A
975A
131A
127A
117
125A
135A
137A
137A
This Illustration Represents Several
Carburetors. Parts Shown May Not
Be Included In All Kits.
634A
141A
108A
217
141C
652
121A CARBURETOR OVERHAUL KIT
95A
104A
105A 127A
634A
51 1266
1266A
987A
137A137A137A137A
617
51A
217
98A
947A
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--6 Assemblies include all parts shown in frames. 03/23/2009
6
1040
613
81
613A
883
823
677
864
676
613
81
1040A
676A
677
1266A
1266
431
1036 EMISSIONS LABEL
613B
304
1267
967
643
968
445
187D
601
187A
601
773
1139
305
305A
883
864
883 883
300A 300B
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--7 Assemblies include all parts shown in frames. 03/23/2009
7
697
783
1051
363
73
74
729A
802
579
1051
310
801
311
797
513
783
37A
597
456
689
459
56
57
55
58
65
1044
309
510
608
1090
455
37
23A
78
563
493
949
60
78A
23
729B
75
1070
1005
1005A
1070A
1005B
415A
73A
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--8 Assemblies include all parts shown in frames. 03/23/2009
8
527
356B
1054
356
729
240 240A
918
601
187
601
385A
387
387A
385
957
972
601
187B
521
789
356A
356C
789A
601
187A
788
385
387A
601
187B
601
187C 527A
729
789B
920
216
202
232
267
265
209
222
188
616
404
614
562
505
227
559
559A
621
268
269
271
270
359
507 520
373
851
334
333
205
203
958
601A
216A
601
187D
670
Not for
Reproduction
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--9 Assemblies include all parts shown in frames. 03/23/2009
9
578 878
474B 474C
877A 877B
877
DUAL
CIRCUIT
DC ONLY
NOTE: All stators use a No. mounting screw.
1119
NOTE: The proper flywheel part number and/or the alternator magnet size will
determine the alternator type or output. See repair instruction manual
for additional information.
474A 1059 10591059
501A
526A
TRI
578
501B
526B
877C
10 -- 16 AMP
474D 1059
578
501D
526B
CIRCUIT
501C
526A
Not for
Reproduction
REF. PART REF. PART REF. PART
NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION
21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036--10 Assemblies include all parts shown in frames. 03/23/2009
10
1 697377 Cylinder Assembly
2 399265 Kit--Bushing/Seal
(Magneto Side)
3 391086S Seal--Oil
(Magneto Side)
4 697106 Sump--Engine
(Used After Code Date
05100200).
-- -- -- -- -- -- N o t e -- -- -- -- -- --
795940 Sump--Engine
(Used Before Code
Date 05100200).
Must Use Kit 795940,
Includes Sump And
Counterweight.
4A 697188 Sump--Engine
(Used After Code Date
05100200).
Used on Type No(s).
0016, 0036, 0038,
0110, 0114, 0116,
0117, 0119, 0120,
0123, 0124, 0126,
0127, 0129, 0130,
0136, 0138, 0141,
0142, 0146, 0147,
0149, 0152, 0155,
0156, 0157, 0160,
0163, 0183, 0190,
0193, 0194, 0195,
0197, 0198, 0202,
0205, 0206.
-- -- -- -- -- -- N o t e -- -- -- -- -- --
795957 Sump--Engine
(Used Before Code
Date 05100200).
Used on Type No(s).
0016, 0036, 0038,
0110, 0114, 0116,
0117, 0119, 0120,
0123, 0124, 0126,
0127, 0129, 0130,
0136, 0138, 0141,
0142, 0146, 0147,
0149, 0152, 0155,
0156, 0157, 0163,
0183, 0190, 0193,
0194, 0195, 0197,
0198, 0202.
Must Use Kit 795957,
Includes Sump And
Counterweight.
5 796183 Head--Cylinder
7 273280S Gasket--Cylinder Head
9 697109 Gasket--Breather
(Used Before Code
Date 07071900).
(After Date Code Use
Liquid Sealant
Reference 850)
10 697157 Screw
(Breather Assembly)
11 794683 Tube--Breather
12 697110 Gasket--Crankcase
(.015” Thick)
(Standard)
13 690360 Screw
(Cylinder Head)
14 790560 Stud
(Cylinder Head)
15 690946 Plug--Oil Drain
(3/8” Standard)
16 697390 Crankshaft
20 795387 Seal--Oil
(PTO Side)
22 692125 Screw
(Crankcase
Cover/Sump)
23 698281 Flywheel
Used on Type No(s).
0026, 0036, 0038,
0120, 0121, 0124,
0129, 0131, 0132,
0138, 0140, 0141,
0146, 0147, 0149,
0152, 0153, 0159,
0163, 0183, 0190,
0193, 0203, 0205.
-- -- -- -- -- -- N o t e -- -- -- -- -- --
693556 Flywheel
Used on Type No(s).
0020, 0127, 0157,
0192, 0194, 0198,
0202.
693557 Flywheel
Used on Type No(s).
0028, 0126, 0154,
0156, 0160, 0164.
698282 Flywheel
Used on Type No(s).
0110, 0119, 0123,
0130, 0136, 0155,
0195, 0197, 0206.
23A 693555 Flywheel
(Rewind Starter)
Used on Type No(s).
0015, 0016, 0117,
0142.
-- -- -- -- -- -- N o t e -- -- -- -- -- --
698283 Flywheel
(Rewind Starter)
Used on Type No(s).
0022, 0116.
24 222698S Key--Flywheel
25 792307 Piston Assembly
(Standard)
-- -- -- -- -- -- N o t e -- -- -- -- -- --
792728 Piston
Assembly
(.020” Oversize)
26 792306 Ring Set
(Standard)
-- -- -- -- -- -- N o t e -- -- -- -- -- --
792643 Ring Set
(.020” Oversize)
27 698469 Lock--Piston Pin
(Used After Code Date
02100300).
-- -- -- -- -- -- N o t e -- -- -- -- -- --
698138 Lock--Piston
Pin
(Used Before Code
Date 02100400).
28 697099 Pin--Piston
29 791633 Rod--Connecting
(Standard)
-- -- -- -- -- -- N o t e -- -- -- -- -- --
697262 Rod--
Connecting
(.020” Undersize)
(Used Before Code
Date 05040400).
32 791118 Screw
(Connecting Rod)
33 695760 Valve--Exhaust
34 791935 Valve--Intake
35 691279 Spring--Valve
(Intake)
36 691279 Spring--Valve
(Exhaust)
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