FORM MS10488 REV C 10/09/2015 REPLACES MS10488 REV B 04/17/2015 FILE IN SECT. 2 OF SERVICE MANUAL 31R900 Illustrated Parts List Model Series 31R900 TYPE NUMBERS 0001, 0002, 0003, 0005 Thru 0047
TABLE OF CONTENTS
Air Cleaner ...... 5 Alternator ...... 6 Blower Housing ...... 5 Camshaft ...... 2 Carburetor ...... 4 Controls ...... 6 Crankshaft ...... 2 Cylinder ...... 2 Cylinder Head ...... 3 Electric Starter ...... 6 Engine Sump ...... 2 Exhaust System ...... 3 Flywheel ...... 5 Fuel Supply ...... 4 Gasket Set -- Engine ...... 7 NotGasket Setfor -- Valve ...... 7 Governor Spring ...... 6 Ignition ...... 6 Kit --Reproduction Carburetor Overhaul ...... 4, 7 Lubrication ...... 2 Operator’s Manual ...... 2 Piston, Rings, Connecting Rod ...... 2 Valves ...... 3 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. 31R900
1036 EMISSIONS LABEL 1058 OPERATOR’S MANUAL 1319 WARNING LABEL
28 29 1 32 2 3 27 43 306A
25 27 11 718 684 584
9 850 306 552 6 691 1264 26 13 1263
307
16 16A 758 1270 1024A
46 757 45 24 759 965
377 377 943
750 357
741 741 4C 4A
4 1017 847 Not for 12 847A 12 523 523 512
842 842 Reproduction
525 525A 186A 20
20 19 415
524 524 22 15 1027
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--2 Assemblies include all parts shown in frames. 10/09/2015 2 31R900
5 33 34 45 13 42 868 42 1026 306A 337 36 635 7 307 35 383 883
50 654 1022 238 53 51 1034 51A 830 617 617 192 415 54
850 1029 1022 50A 51 50B 51 914 51 51A 51A 617 617 1023 53 51A 186 654 54 415 832
832A 832B
Not for836 676 676A 676B 994 613B
300 Reproduction 613 677 677A 677 377 81 300B 883
883 613B
864 864
883 883 613 81 613A
823 823
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--3 Assemblies include all parts shown in frames. 10/09/2015 3 31R900
125 141 634B 187 131A 217 633 130A 108B 601 95A 118 633B 98A 117
94A 51 112 318 1478 1091 105A 127A 951 133A 104A 1479A 422A
135 216A 137A 1479 975A 137A
121A CARBURETOR OVERHAUL KIT 137A 98A 51 127A
104A 633B
1266 217 1127 NIKKI 105A 633 276A 51A 617 1266A 276A 947A 276A Not for Reproduction
1139 240B 240 240A 387A 773 918 958
187 187A 601 187B 187D 601
601 601 601 601
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--4 Assemblies include all parts shown in frames. 10/09/2015 4 31R900
304G
1040
445B
968B
1040B
305C 1139 305 773 305B
431B 967B
1266 964
608 324 65 415A
455
78 Not for 1044 78A Reproduction37 37A 1005
363 23 24 1051
783
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--5 Assemblies include all parts shown in frames. 10/09/2015 5 31R900
DUAL CIRCUIT 5/9 AMP 789 TRI--CIRUIT 526A 877D 474B 1059 474C 1059 501A 877 877A
501E 789B
526B
729
878 1119 878A
789E
729A 356B
112 318 1478 521 951 333 1479A 1448 422A 1054 216A 1479 851
334
333A 789C
697 309 Not for 227 510 801 1051 616 Reproduction505 404 614 562 783 188 310 513 216 202 222 232 209 265 1090 503 462 268 559 267 579 559A 269 802 270 271
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--6 Assemblies include all parts shown in frames. 10/09/2015 6 31R900
121A CARBURETOR OVERHAUL KIT 137A 98A 51 127A
104A 633B
105A 633 1266 217
51A 617 1266A 276A
358 ENGINE GASKET SET
3 20 691 51 943
7 51A 842
524 868 1022
9 12 883 1266 617 1266A
Not for 1095 VALVE GASKET SET
1022 51 Reproduction7 868 883
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--7 Assemblies include all parts shown in frames. 10/09/2015 7 31R900 REF. PART REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION 1 796010 Cylinder Assembly 23 591758 Flywheel 796172 Piston 2 797673 Kit--Bushing/Seal ------N o t e ------Assembly (Magneto Side) 591759 Flywheel (Used Before Code 3 391086s Seal--Oil Used on Type No(s). Date 15030200). (Magneto Side) 0010, 0014, 0015, Used on Type No(s). 4 697106 Sump--Engine 0017, 0018, 0019, 0014, 0015, 0024, Used on Type No(s). 0020, 0024, 0026, 0018, 0019, 0025, 0006, 0007, 0012, 0031, 0033, 0035, 0031. 0018, 0019, 0020, 0037, 0038, 0041, 594436 Piston 0022, 0025, 0031, 0042, 0043, 0046. Assembly 0038, 0042, 0044. 591760 Flywheel (.020” Oversize) 4A 592849 Sump--Engine Used on Type No(s). (Used After Code Date 4C 591009 Sump--Engine 0002, 0003, 0006, 14100500). Used on Type No(s). 0007, 0013, 0016, 796173 Piston 0028. 0022, 0027, 0044, Assembly 5 796026 Head--Cylinder 0045, 0047. (.020” Oversize) 6 690310 Washer 591761 Flywheel (Used Before Code 7 796584 Gasket--Cylinder Head Used on Type No(s). Date 14100600). 9 697109 Gasket--Breather 0029. 594436 Piston (Use Liquid Sealant 24 591757 Key--Flywheel Assembly Reference 850) 25 594435 Piston Assembly (.020” Oversize) 11 794683 Tube--Breather (Standard) (Used After Code Date 12 697110 Gasket--Crankcase (Used After Code Date 14093000). 13 592244 Screw 14100500). Used on Type No(s). (Cylinder Head) ------N o t e ------0039. (5/16--18 x 2.69) 796172 Piston 796173 Piston 15 690946 Plug--Oil Drain Assembly Assembly (Square Head) (Used Before Code (.020” Oversize) ------N o t e ------Date 14100600). (Used Before Code 691680 Plug--Oil Drain 594435 Piston Date 14100100). (Square Socket) Assembly Used on Type No(s). 16 591762 Crankshaft (Used After Code Date 0039. 16A 591763 Crankshaft 14093000). 594436 Piston 0001, 0003, 0005, Used on Type No(s). Assembly 0008, 0010, 0011, 0039. (.020” Oversize) 0013, 0016, 0030, 796172 Piston (Used After Code Date 0034, 0035, 0039, Assembly 15030100). 0045, 0047. Not for(Used Before Code Used on Type No(s). 19 591010 Seal--Oil Date 14100100). 0014, 0015, 0024, 20 795387 Seal--Oil Used on Type No(s). 0018, 0019, 0025, (PTO Side) 0039. 0031. 22 692125 Screw Reproduction594435 Piston 796173 Piston (Crankcase Assembly Assembly Cover/Sump) (Used After Code Date (.020” Oversize) 15030100). (Used Before Code Used on Type No(s). Date 15030200). 0014, 0015, 0024, Used on Type No(s). 0018, 0019, 0025, 0014, 0015, 0024, 0031. 0018, 0019, 0025, 0031.
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--8 Assemblies include all parts shown in frames. 10/09/2015 8 31R900 REF. PART REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION 26 594437 Ring Set 27 698469 Lock--Piston Pin 37 697352 Guard--Flywheel (Standard) 28 594439 Pin--Piston 37A 697626 Guard--Flywheel ------N o t e ------(1.62” Long) 42 499586 Keeper--Valve 594438 Ring Set (Used After Code Date 43 691968 Slinger--Governor/Oil (.020” Oversize) 14100500). 45 690564 Tappet--Valve (Used After Code Date ------N o t e ------46 793880 Camshaft 14100500). 796007 Pin--Piston 50 592845 Manifold--Intake 792649 Ring Set (1.97” Long) 50A 591248 Manifold--Intake (.020” Oversize) (Used Before Code 50B 592842 Manifold--Intake (Used Before Code Date 14100600). 51 692137 Gasket--Intake Date 14100600). 594439 Pin--Piston 51A 796081 Gasket--Restrictor 594438 Ring Set (1.62” Long) 53 591260 Stud (.020” Oversize) (Used After Code Date (Carburetor) (Used After Code Date 14093000). 54 691148 Screw 14093000). Used on Type No(s). (Intake Manifold) Used on Type No(s). 0039. 65 690940 Screw 0039. 796007 Pin--Piston (Starter--Rewind) 792649 Ring Set (1.97” Long) 78 691693 Screw (.020” Oversize) (Used Before Code (Flywheel Guard) (Used Before Code Date 14100100). 78A 690364 Screw Date 14100100). Used on Type No(s). (Starter Guard) Used on Type No(s). 0039. 81 691178 Lock--Muffler Screw 0039. 594439 Pin--Piston 94A 793610 Kit--Idle Mixture 594438 Ring Set (1.62” Long) (Nikki) (.020” Oversize) (Used After Code Date 95A 690718 Screw (Used After Code Date 15030100). (Throttle Valve) 15030100). Used on Type No(s). (Nikki) Used on Type No(s). 0014, 0015, 0024, 98A 695408 Kit--Idle Speed 0014, 0015, 0024, 0018, 0019, 0025, (Nikki) 0018, 0019, 0025, 0031. 104A 694918 Pin--Float Hinge 0031. 796007 Pin--Piston (Nikki) 792649 Ring Set (1.97” Long) 105A 696136 Valve--Float Needle (.020” Oversize) (Used Before Code (Nikki) (Used Before Code Date 15030200). 108B 698773 Valve--Choke Date 15030200). Used on Type No(s). (Nikki) Used on Type No(s). 0014, 0015, 0024, 112 593040 Screw-- Shoulder 0014, 0015, 0024, 0018, 0019, 0025, (Choke Lever) 0018, 0019, 0025, Not for0031. 117 699733 Jet--Main 0031. 29 794122 Rod--Connecting (Standard) ------N o t e ------118 843099 Jet--Main 794571 (5000)(High Altitude) ReproductionRod--Connecting 121A 796184 Kit--Carburetor Used on Type No(s). Overhaul 0001, 0003, 0005, (Nikki) 0008, 0013, 0016, 125 591734 Carburetor 0047. (Nikki) 32 791118 Screw ------N o t e ------(Connecting Rod) 593029 Carburetor 33 792868 Valve--Exhaust (Nikki) 34 791935 Valve--Intake Used on Type No(s). 35 691279 Spring--Valve 0046. (Intake) 127A 690727 Plug--Welch 36 691279 Spring--Valve (Nikki) (Exhaust)
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--9 Assemblies include all parts shown in frames. 10/09/2015 9 31R900 REF. PART REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION 130A 792747 Valve--Throttle 192 691986 Adjuster--Rocker Arm 271 691028 Lever--Control (Nikki) 202 691841 Link--Mechanical 276A 695410 Washer--Sealing 131A 792765 Kit--Throttle Shaft Governor 300 795998 Muffler (Nikki) 209 796260 Spring--Governor 300B 795997 Muffler 133A 694914 Float--Carburetor (Green) 304G 591642 Housing--Blower (Nikki) ------N o t e ------(Black--Compatible 135 698780 Tube--Fuel Transfer 690576 Spring-- With Canister Style ------N o t e ------Governor Filter) 796400 Tube--Fuel (Gold) ------N o t e ------Transfer Used on Type No(s). 591643 (Nikki) 0009, 0023, 0036, Housing--Blower Used on Type No(s). 0040. (Black) (w/Threaded 0001, 0002, 0003, 796261 Spring-- Inserts for Rewind 0005, 0008, 0009, Governor Starter) (Compatible 0013, 0016, 0021, (Yellow) With Canister Style 0022, 0027, 0028, Used on Type No(s). Filter) 0030, 0032, 0034, 0012, 0035. 305 697102 Screw 0039, 0044, 0045, 792602 Spring-- (Shoulder)(Blower 0046, 0047. Governor Housing) 137A 698781 Gasket--Float Bowl (Red) 305B 795891 Screw (Nikki) Used on Type No(s). (Self Threading) 141 698778 Kit--Choke Shaft 0016, 0028, 0030, 305C 799370 Screw 186 794873 Hose--Connector 0032, 0045. (Shoulder)(Blower 186A 796532 Hose--Connector 260902 Spring-- Housing) (Oil Drain) Governor 306 592777 Shield--Cylinder 187 791766 Line--Fuel (Natural) 306A 794953 Shield--Cylinder (Straight)(Cut to Used on Type No(s). 307 691693 Screw Required Length) 0039. (Cylinder Shield) 187A 796491 Line--Fuel 216 691840 Link--Choke 309 593964 Motor--Starter (Formed) 216A 593043 Link--Choke ------N o t e ------(Cut to Required (Ready Start) 593936 Motor--Starter Length) 217 695409 Spring--Choke Return Used on Type No(s). 187B 791805 Line--Fuel 222 694042 Bracket--Control 0023, 0036, 0040. (Formed) 227 691374 Lever--Governor 310 690323 Screw (Cut to Required Control (Starter Motor) Length) 232 691842 Spring--Governor Link (#10--24 X 4.44) 187D 791744 Line--Fuel 238 691843 Cap--Valve 318 594384 Screw (Formed) Not240 for394358s F ilter--Fuel (Snap Switch) (Cut to Required (White, 75 Microns) 324 593933 Screen--Rotating Length) 240A 691035 Filter--Fuel 333 799650 Armature--Magneto 188 691693 Screw (Includes 40 Micron Used on Type No(s). (Control Bracket) ReproductionPaper Element) 0002, 0003, 0006, 240B 695666 Filter--Fuel 0010, 0013, 0016, (Includes 30 Micron 0023, 0045. Paper Element) 333A 592841 Armature--Magneto 265 691024 Clamp--Casing 334 691061 Screw 267 794904 Screw (Magneto Armature) (Casing Clamp) 268 691025 Casing--Control Wire (Cut To Required Length) 269 691026 Wire--Control (Cut To Required Length) 270 691027 Nut (Control Wire Casing)
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--10 Assemblies include all parts shown in frames. 10/09/2015 10 31R900 REF. PART REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION 337 792015 Plug--Spark 474B 592831 Alternator 552 697144 Bushing--Governor (EMS)(Resistor) (Dual Circuit) Crank ------N o t e ------Used on Type No(s). 559 697561 Screw 491055s Plug--Spark 0010, 0014, 0015, (.375 Inches Remote (Resistor) 0017, 0018, 0019, Choke Stop) Used on Type No(s). 0020, 0024, 0026, 559A 693675 Screw 0001, 0002, 0003, 0029, 0031, 0033, (.419 Inches Remote 0013, 0014, 0015, 0035, 0037, 0038, Choke Stop) 0017, 0018, 0019, 0041, 0042, 0043, 562 691119 Bolt 0020, 0021, 0027, 0046. (Governor Control 0028, 0034, 0038, 474C 592829 Alternator Lever) 0041, 0043. (Tri Circuit) 579 691029 Nut 691043 Plug--Spark (5/9 Amp. Regulated) (Starter Cable) (EMS) 501A 794360 Regulator 584 794682 Cover--Breather Used on Type No(s). (5/9 Amp.) Passage 0006, 0007, 0010, 501E 698315 Regulator (Use With Liquid 0011, 0022, 0024. (9 Amp.) Sealant Reference 356B 697089 Wire--Stop Used on Type No(s). 850) 357 691483 Key--Drive Pulley 0016, 0045. 601 791850 Clamp--Hose 358 796187 Gasket Set--Engine 503 691532 Strap--Starter 608 591606 Starter--Rewind 363 19203 Puller--Flywheel 505 691251 Nut 613 691416 Screw 377 691639 Key--Woodruff (Governor Control (Muffler) 383 19576s Wrench--Spark Plug Lever) 613A 691678 Screw 387A 808656 Pump--Fuel 510 693699 Drive--Starter (Muffler) 404 691691 Washer 512 594200 Hose--Oil Drain (5/16--16 x .63) (Governor Crank) 513 692024 Clutch--Drive 613B 690297 Screw 415 794903 Plug 521 690581 Shield--Cable (Muffler) (Engine Sump) 523 699908 Dipstick (1/4--20 X .63) 415A 794129 Plug 524 691032 Seal--Dipstick Tube 614 691620 Pin--Cotter (Cover/Retainer) 525 697085 Tube--Dipstick 616 692012 Crank--Governor 422A 593056 Switch--Snap (With Tube Connector) 617 692138 Seal--O Ring (Ready Start) 525A 697184 Tube--Dipstick (Intake Manifold) 431B 797901 Elbow--Intake (Standard) 633 699813 Seal--Choke/Throttle (Compatible With 526A 697088 Screw Shaft Canister Style Filter) (Regulator) (Nikki) 445B 594201 Filter--Air Cleaner 526B 697348 Screw 633B 690998 Seal--Throttle Shaft Cartridge (Regulator) (Nikki) (Canister Style Filter)Not for 455 796615 Cup--Starter 462 691261 Washer (Starter Cable) Reproduction
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--11 Assemblies include all parts shown in frames. 10/09/2015 11 31R900 REF. PART REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION 634B 698779 Spring/Seal Assembly 757 793242 Link--Counterweight 847 790443 Dipstick/Tube (Nikki) 758 594443 Counterweight Assembly 635 691909 Boot--Spark Plug (Used After Code Date (With Tube Connector) 654 690958 Nut 14100500). 847A 790442 Dipstick/Tube (Carburetor) ------N o t e ------Assembly 676 795036 Deflector--Muffler 793763 Counterweight 850 100106 Sealant--Liquid 676A 396903 Deflector--Muffler (Used Before Code (Rocker Cover Gasket 676B 795038 Deflector--Muffler Date 14100600). and Breather Gasket) 677 794845 Screw 594443 Counterweight (Used After Code Date (Muffler Deflector) (Used After Code Date 07071800). 677A 690661 Screw 14093000). 851 692424 Terminal--Spark Plug (Muffler Deflector) Used on Type No(s). 864 796002 Adapter--Muffler 684 697157 Screw 0003, 0010, 0011, (Length 2.25 Inches) (Breather Assembly) 0013, 0016, 0030, 868 690968 Seal--Valve 691 692407 Seal--Governor Shaft 0035, 0039. 877 393456 Wire/Connector-- 697 791680 Screw 793763 Counterweight Alternator (Drive Cap) (Used Before Code (Dual Circuit) 718 690959 Pin--Locating Date 14100100). 877A 393814 Wire/Connector-- 729 691335 Clip--Wire Used on Type No(s). Alternator (Wire Saddle) 0003, 0010, 0011, 877D 790544 Wire/Connector-- 729A 691224 Clip--Wire 0013, 0016, 0030, Alternator (Aluminum Coated 0035, 0039. 878 398661 Harness--Alternator Steel) 594443 Counterweight (Dual Circuit) 741 697128 Gear--Timing (Used After Code Date 878A 691955 Harness--Alternator 750 790832 Screw 15030100). (Tri Circuit) (Oil Pump Cover) Used on Type No(s). 883 692236 Gasket--Exhaust 0014, 0015, 0018, 914 691108 Screw 0019, 0024, 0025, (Rocker Cover) 0031. 918 791851 Hose--Vacuum 793763 Counterweight (Fuel Pump) (Used Before Code 943 690589 Seal--O Ring Date 15030200). (Oil Pump Cover) Used on Type No(s). 947A 699915 Solenoid--Fuel 0014, 0015, 0018, (Nikki) 0019, 0024, 0025, 951 593039 Lever--Solenoid 0031. (Ready Start) 759 697392 Pin--Counterweight 958 698183 Valve--Fuel Shut Off Not773 for 796448 Retainer 964 799159 Cap--Connector 783 593935 Gear--Pinion (EVAP) 789 698329 Harness--Wiring 965 499613 Cover--Oil Pump 789B 692037 Harness--Wiring 967B 797704 Filter--Pre Cleaner 789CReproduction 594359 Wire Assembly 968B 591647 Cover--Air Cleaner 789E 594999 Harness--Wiring (Black) (Compatible Used in Conjunction With Canister Style with Regulator 698315 Filter) 801 691283 Cap--Drive 975A 699502 Bowl--Float 802 691286 Cap--End (Nikki) 823 698941 Screw 994 794945 Arrestor--Spark (Muffler Adapter) 1005 796083 Fan--Flywheel 830 691095 Stud--Rocker Arm 1017 796981 Screen--Oil Pump 832 790293 Guard--Muffler (Push In) 832A 595029 Guard--Muffler 1022 272475s Gasket--Rocker Cover 832B 706336 Guard--Muffler (Use Liquid Sealant 836 690367 Screw Reference 850) (#8--18 X .56) 1023 797421 Cover--Rocker 842 691031 Seal--O Ring 1024A 794644 Pump--Oil (Dipstick Tube)
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--12 Assemblies include all parts shown in frames. 10/09/2015 12 31R900 REF. PART REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION NO. NO. DESCRIPTION 1026 692003 Rod--Push 1040 698368 Plate--Trim 1266 691917 Seal--O Ring (Intake) 1040B 699852 Plate--Trim (Intake Elbow) ------N o t e ------1044 698139 Screw 1266A 697123 Seal--O Ring 692011 Rod--Push (Flywheel) (Intake Elbow) (Exhaust) 1051 691265 Ring--Retaining 1270 793243 Plug--AVS 1027 696854 Filter--Oil 1054 280275 Tie--Cable Counterweight (Premium Yellow) 1058 276344 Operator’s Manual 1319 794467 Label--Warning ------N o t e ------1059 698516 Kit--Screw/Washer 1448 690260 Washer 1090 691293 Retainer--Brush (Magneto Armature) 492932s Filter--OIL 1091 691333 Cap--Limiter 1478 593037 Solenoid-- Choke (Standard Black) 1095 794152 Gasket Set--Valve (Ready Start) 798576 Filter--OIL 1119 691183 Screw 1479 593041 Screw--Thread (Premium Orange) (Alternator) Forming 1029 691751 Arm--Rocker 1127 695407 Screw (Ready Start) 1034 690822 Guide--Push Rod (Float Bowl) 1479A 593042 Screw--Thread 1036 Label--Emissions 1139 796449 Washer Forming (Available From A 1263 697124 Reed--Breather (Ready Start) Briggs & Stratton 1264 697104 Screw Authorized Dealer) (Breather Reed)
Not for Reproduction
Illustrations cover a range of engines. Parts shown without corresponding text may not be used on your specific engine. 10488--13 Assemblies include all parts shown in frames. 10/09/2015 13 Not for Reproduction Not for Reproduction Not for Reproduction