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TRACTOR - - MODEL NUMBER 917.274810
BRIGGS & STRATTON ENGINE-MODEL NUMBER 31P777, TYPE NUMBER 0378-E1
KEY PART KEY PART
NO. NO. DESCRIPTION NO. NO. DESCRIPTION
1 697174 Cylinder Assembly 106 690577 O Seat-Inlet
2 399265 Kit-Bushing/Seal (Magneto 108 690464 Valve-Choke (Manual Choke)
Side) 108A 692344 Valve-Choke (Choke A Matic)
3 391086 • Seal-Oil (Magneto Side) 117 694352 O Jet-Main (Standard)
4 697188 Sump-Engine 118 697228 Jet-Main (High Altitude)
5 698147 Head-Cylinder 121 697241 Kit-Carburetor Overhaul
7 699168 °+ Gasket-Cylinder Head 125 697190 Carburetor
9 697109 ° Gasket-Breather 127 695005 Plug-Welch
11 697113 Tube-Breather 130 691750 Valve-Throttle
12 697110 ° Gasket-Crankcase 131 494379 Kit-Throttle Shaft
13 690360 Screw (Cylinder Head) 133 494381 Float-Carburetor
15 690946 Plug-Oil Drain 137 281165 O$ Gasket-Float Bowl
16 697127 Crankshaft 141 495097 Kit-Choke Shaft
20 690947 ° Seal-Oil (PTO Side) (Manual Choke)
22 692125 Screw (Crankcase Cover/Sump) 141A 495931 Kit-Choke Shaft
23 693557 Flywheel (Choke A Matic)
24 222698 Key-Flywheel 142 697140 O Nozzle-Carburetor
25 699052 Piston Assembly (Standard) 146 691639 Key-Timing
-- 699054 Piston Assembly 186 698174 Connector-Hose
(.020" Oversize) 187 699331 Line-Fuel
26 699051 Ring Set (Standard) 188 691693 Screw (Control Bracket)
-- 697559 Ring Set (.020" Oversize) 192 691986 Adjuster-Rocker Arm
27 698469 Lock-Piston Pin 202 691841 Link-Mechanical Governor
28 697099 Pin-Piston 209 692208 Spring-Governor
29 697126 Rod-Connecting (Standard) 216 691840 Link-Choke
-- 697263 Rod-Connecting 222 694042 Bracket-Control
(.020" Undersize) 227 691374 Lever-Governor Control
32 692852 Screw (Connecting Rod) 232 691842 Spring-Governor
33 695760 Valve-Exhaust 238 691843 Cap-Valve
34 695761 Valve-Intake 240 394358 Filter-Fuel
35 691279 Spring-Valve (Intake) 265 691024 Clamp-Casing
36 691279 Spring-Valve (Exhaust) 267 695134 Screw (Casing Clamp)
37 697108 Guard-Flywheel 276 692255 O$ Washer-Sealing
42 690964 Retainer-Valve 304 699829 Housing-Blower
43 691968 Slinger-Governor/Oil 305 697102 Screw (Blower Housing)
45 690564 Tappet-Valve 305A 697103 Screw (Blower Housing)
46 790400 Camshaft 306 697107 Shield-Cylinder
48 697762 Short Block 307 691003 Screw (Cylinder Shield)
50 690193 Manifold-Intake 309 693551 Motor-Starter
51 692137 ,O_+ Gasket-Intake 310 690323 Bolt (Starter Motor)
53 690227 Stud (Carburetor) 311 497608 Brush Set
54 691148 Screw (intake Manifold) 333 492341 Armature-Magneto
73 697133 Screen-Rotating 334 691061 Screw (Magneto Armature)
74 697897 Screw (Rotating Screen)
78 691003 Screw (Flywheel Guard) included in Engine Gasket Set, Key. No. 358
89 690283 Plug-Oil O included in Carburetor Overhaul Kit, Key. No.
93 690602 O Bushing-Throttle Shaft 121
94 498030 Kit-Idle Mixture $ included in Carburetor Gasket Set, Key. No.
95 691636 Screw (Throttle Valve) 977
98 495800 Kit-Idle Speed + included in Valve Gasket Set, Key. No. 1095
104 690525 O Pin-Float Hinge
105 231855 O Valve-Float Needle NOTE: All component dimensions given in U.S. inches
1 inch = 25.4 mm
50