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TRACTOR
- - MODEL
NUMBER
917.274820
BRIGGS & STRATTON ENGINE-MODEL
NUMBER 31P777, TYPE NUMBER 0378-E1
KEY
PART
KEY
PART
NO.
NO.
DESCRIPTION
NO.
NO.
DESCRIPTION
3
4
5
7
9
11
12
13
15
16
20
22
23
24
25
26
27
28
29
32
33
34
35
36
37
42
43
45
46
48
50
51
53
54
73
74
78
89
93
94
95
98
104
105
697174
Cylinder Assembly
106
690577 O
Seat-Inlet
399265
Kit-Bushing/Seal
(Magneto
108
690464
Valve-Choke (Manual Choke)
Side)
108A
692344
Valve-Choke (Choke A Matic)
391086 °
Seal-Oil (Magneto Side)
117
694352 a
Jet-Main (Standard)
697188
Sump-Engine
118
697228
Jet-Main (High Altitude)
698147
Head-Cylinder
121
697241
Kit-Carburetor Overhaul
699168 °+
Gasket-Cylinder
Head
125
697190
Carburetor
697109 °
Gasket-Breather
127
695005
Plug-Welch
697113
Tube-Breather
130
691750
Valve-Throttle
697110 °
Gasket-Crankcase
131
494379
Kit-Throttle Shaft
690360
Screw (Cylinder Head)
133
494381
Float-Carburetor
690946
Plug-Oil Drain
137
281165 G:I:
Gasket-Float Bowl
697127
Crankshaft
141
495097
Kit-Choke Shaft
690947 °
Seal-Oil (PTO Side)
(Manual Choke)
692125
Screw (Crankcase Cover/Sump)
141A
495931
Kit-Choke Shaft
693557
Flywheel
(Choke A Matic)
222698
Key-Flywheel
142
697140 _9
Nozzle-Carburetor
699052
Piston Assembly (Standard)
146
691639
Key-Timing
699054
Piston Assembly (.020"
186
698174
Connector-Hose
Oversize)
187
699331
Line-Fuel
699051
Ring Set (Standard)
188
691693
Screw (Control Bracket)
697559
Ring Set (.020" Oversize)
192
691986
Adjuster-Rocker Arm
698469
Lock-Piston Pin
202
691841
Link-Mechanical Governor
697099
Pin-Piston
209
692208
Spring-Governor
697126
Rod-Connecting (Standard)
216
691840
Link-Choke
697263
Rod-Connecting (.020"
222
694042
Bracket-Control
Undersize)
227
691374
Lever-Governor Control
692852
Screw (Connecting Rod)
232
691842
Spring-Governor
695760
Valve-Exhaust
238
691843
Cap-Valve
695761
Valve-Intake
240
394358
Filter-Fuel
691279
Spring-Valve (Intake)
265
691024
Clamp-Casing
691279
Spring-Valve (Exhaust)
267
695134
Screw (Casing Clamp)
697108
Guard-Flywheel
276
692255 Q:I:
Washer-Sealing
690964
Retainer-Valve
304
699829
Housing-Blower
691968
Slinger-Governor/Oil
305
697102
Screw (Blower Housing)
690564
Tappet-Valve
305A
697103
Screw (Blower Housing)
790400
Camshaft
306
697107
Shield-Cylinder
697762
Short Block
307
691003
Screw (Cylinder Shield)
690193
Manifold-Intake
309
693551
Motor-Starter
692137 °O:1:+Gasket-Intake
310
690323
Bolt (Starter Motor)
690227
Stud (Carburetor)
311
497608
Brush Set
691148
Screw (Intake Manifold)
333
492341
Armature-Magneto
697133
Screen-Rotating
334
691061
Screw (Magneto Armature)
697897
Screw (Rotating Screen)
691003
Screw (Flywheel Guard)
•
Included in Engine Gasket Set, Key. No. 358
690283
Plug-Oil
(D
Included in Carburetor Overhaul Kit, Key. No.
690602 O
Bushing-Throttle
Shaft
121
498030
Kit-Idle Mixture
:1:
Included in Carburetor Gasket Set, Key. No.
691636
Screw (Throttle Valve)
977
495800
Kit-Idle Speed
+
Included in Valve Gasket Set, Key. No. 1095
690525 G
Pin-Float Hinge
231855 G
Valve-Float Needle
NOTE: All component dimensions given in U.S. inches
1 inch = 25.4 mm
52
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