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).