Briggs & Stratton 21B900 Series Setup guide

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PRINTED IN U.S.A.
FORM MS−5036−06/18/2008
REPLACES FORM MS−5036−03/04/2008
FILE IN SECT. 2 OF SERVICE MANUAL
21B900
Illustrated Parts List
Model Series
21B900
TYPE NUMBERS
0015 through 0202.
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. . . . . . . . . . . . . . . . . . . . . .

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−2Assemblies include all parts shown in frames. 06/18/2008
2
12
20
4
750
943
1024
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

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−3Assemblies include all parts shown in frames. 06/18/2008
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

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−4Assemblies include all parts shown in frames. 06/18/2008
4
42
51
53
54
654
617
635
13
830
1034
1022
883
7
238
36 868
35
1022
1023
914
1022
868
51
1095 VALVE GASKET SET
7
383
5
192
1022
12
9
7
3
358 ENGINE GASKET SET
868
691
524
51
20
617 883
1266
842
34
50
1029
45
1026
1266A
42
42
33
337
14
705
617 51
943
850
50B 51
617
186 415

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−5Assemblies include all parts shown in frames. 06/18/2008
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
104A
105A
51
634A
987A
95A
130A
98A
133A
94A
141A
131A
127A
108A 117 118
1091
231
125A
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
977A CARBURETOR GASKET SET
51
121A CARBURETOR OVERHAUL KIT
95A
104A
105A
127A
617
634A
51
1266
1266A
987A
137A
137A
617
NIKKI
276A
1127
975A
137A 137A
276A
276A
947A
135A

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−6Assemblies include all parts shown in frames. 06/18/2008
6
445
1267
967
305
305A
643
968
304
1040
613
81
613A
883
883
823
677
864
676
613
81
1040A
676A
677
1266A
1266
431
1036 EMISSIONS LABEL
883
613B
300A300G

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−7Assemblies include all parts shown in frames. 06/18/2008
7
697
783
1051
363
73
74
729A
802
579
1051
310
803
544
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 415A
1070A
73A
1005B

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−8Assemblies include all parts shown in frames. 06/18/2008
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

21B900
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine.
5036−9Assemblies include all parts shown in frames. 06/18/2008
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

REF. PART REF. PART REF. PART
NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION
21B900
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.
ΔIncluded 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.
5036−10 Assemblies include all parts shown in frames. 06/18/2008
10
1 697377 Cylinder Assembly
2 399265 Kit−Bushing/Seal
(Magneto Side)
3K391086S Seal−Oil
(Magneto Side)
4 697106 Sump−Engine
(Used After Code Date
05100200).
−−−−−− Note −−−−−−
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, 0163,
0183, 0190, 0193,
0194, 0195, 0197,
0198, 0202.
−−−−−− Note −−−−−−
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 792964 Head−Cylinder
7KΔ273280S Gasket−Cylinder Head
9K697109 Gasket−Breather
(Used Before Code
Date 07071900).
(After Date Code Use
Liquid Sealant
Reference 850)
10 697157 Screw
(Breather Assembly)
11 794683 Tube−Breather
(Used After Code Date
07071800).
−−−−−− Note −−−−−−
697113 Tube−Breather
(Used Before Code
Date 07071900).
12 K697110 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 K791892 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.
−−−−−− Note −−−−−−
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, 0164.
698282 Flywheel
Used on Type No(s).
0110, 0119, 0123,
0130, 0136, 0155,
0195, 0197.
23A 693555 Flywheel
(Rewind Starter)
Used on Type No(s).
0015, 0016, 0117,
0142.
−−−−−− Note −−−−−−
698283 Flywheel
(Rewind Starter)
Used on Type No(s).
0022, 0116.