The 12 HP 300421 B&S Engine
This is the engine used on the B12, B112, B212, 2012, 3012, tractors. It is a cast iron single cylinder engine.
Common Parts: 298060 Condensor 26018 Spring Breaker Arm
![](http://www.michaelstractors.com/forum/upload/B112/20078453439_300421_sketch2.jpg)
23 298975 Flywheel-Magneto 1 74 93521 Screw,screen Mtg 1 85 91386 Screw, Hex Head Cap (2" Long) 1 90 299551 Carburetor Assembly (Not available-Use Part No. 391070) 1 91 299687 Body Assy.-Upper Carburetor 1 92 299357 Body-Upper Carburetor 1 93 23108 Bushing-Throttle Shaft 1 94 292681 Valve-Idle Mixture Included in Carburetor Overhaul Kit-Part No. 299720 1 10 95 93038 Screw-Throttle Valve Mounting Sem 1 96 221939 Valve-Throttle 1 97 298535 Shaft-Throttle 1 98 91920 Screw, Machine Fill (8-32 X 5/8") 1 99 26157 Spring, Compression 1 100 61967 Stop-Throttle Lever 1 101 93043 Pin-Throttle Stop And Governor Shaft 1 102 270268 Gasket-Carburetor Body Included in Carburetor Overhaul Kit-Part No. 299720 1 103 298514 Float-Carburetor 1 104 230896 Pin-Hinge Included in Carburetor Overhaul Kit-Part No. 299720 1 105 299096 Valve-Fuel Inlet Included in Carburetor Overhaul Kit-Part No. 299720 1 107 391069 Body Assy.-Lower Carburetor 1 108 298730 Valve-Choke 1 109 298622 Shaft-Choke 1 110 62899 Washer-Thermostat 1 112 23123 Screw-Shoulder 1 113 299518 Nozzle-Carburetor Included in Carburetor Overhaul Kit-Part No. 299720 1 114 68667 Washer, Fiber (Viton Seat) Included in Carburetor Overhaul Kit-Part No. 299720 1 118 99525 Valve-Needle Included in Carburetor Overhaul Kit-Part No. 299720 1 119 90746 Screw, Machine Fill (10-32 X 5/8") 1 120 92290 Lockwasher, Zinc Pl 1 121 299720 Carburetor Overhaul Kit 1 10 127 221747 Plug-Welch Included in Carburetor Overhaul Kit-Part No. 299720 1 158 27590 Filter-Carburetor Drin 1 10 159 220521 Retainer-Carb Drain 1 10 165 62199 Washer, Steel 1 166 230840 Stud-Air Cleaner 1 169 90832 Washer-Lock 1 171 92129 Nut, Hex Mach (1/4-28) 1 180 291488 Tank-Fuel (Metal) 1 181 69221 Cap-Fuel Tank Metal (1-3/4" O.d. Top) 1 182 22813 Bracket, Tank (8 Quart) (Remote Mount Only) 1 183 291490 Strap, Tank Assy (6 Quart) 1 184 91257 Screw, Machine Fill (1/4-20 X 1-1/2") 1 185 90970 Nut, Square (1/4-20) 1 186 67218 Connector, Fuel 1 187 296004 Line-Fuel (23" Cut To Length) 1 189 90366 Lockwasher, Zinc Pl 1 196 22907 Support, Tank (8 Quart) (Remote Mount Only) 1 240 295984 Carburetor (Used With Flexible Fuel Pipe) 1 241 296005 Fuel Filter Cover 1 242 295913 Valve-Shut 1 243 22547 Screen-Fuel Filter 1 244 230318 Connector, Fuel 1 245 68477 Gasket-Fuel Filter Bowl Included in Gasket Set-Part No. 299719 1 246 298683 Bowl-Fuel Filter 1 10 247 99665 Yoke-Fuel Filter 1 257 22372 Clamp-Casing 1 257 93107 Screw-Slotted 1 10 257 93543 Screw, Sem Hex Head (10-32 X 3/8") 1 266 299361 Control-Throttle (Disc Type) 1 10 268 65616 Casing, Wire (72", Cut To Required Length) If longer casing is required, specify length in inches; if shorter casing is needed, order No. 65616 and cut to required length. 1 269 26633 Wire, Control (78" Cut To Required Length) If longer wire is required, specify length in inches; if shorter wire is needed, order No. 26633 and cut to required length 1 270 63426 Nut, Hex 1 271 290568 Lever-Control 1 304 294698 Housing-Blower 1 305 93158 Screw, Sem Hex Head (1/4-20 X 5/8") 1 321 211555 Fan-Booster 1 324 221851 Screen-Rotating 1 332 230674 Nut-Hex. 1 333 298968 Armature-Mag (For Breaker Ignition) 1 6 334 93381 Screw, Machine Hex 1 339 298185 Breaker-Ignition 1 10 340 26018 Spring-Breaker Arm 1 10 342 298125 Plunger-Contact 1 343 298060 Condenser 1 345 211327 Cover-Breaker 1 10 346 93400 Screw-Slotted 1 348 221976 Switch-Stop 1 10 353 92791 Lockwasher, Interna 1 354 90576 Nut, Hex (8-32) 1 356 295413 Wire-Ground 1 363 19068 Puller-Flywheel (Optional Accessory) 1 451 90364 Lockwasher, Zinc Pl 1 506 90072 Screw-Slotted (8-32 X 5/8") 1 10 507 66895 Insulator-Terminal 1 10 518 69932 Rope/Grip Assy (55") 1 535 270093 Filter-Air 1 536 299709 Cleaner-Air 1 564 92980 Screw, Hex Head Cap (1/4-20 X 1/2") 1 573 299450 Plate-Back 1 586 22906 Retainer 1 587 220509 Clip-Wire 1 588 211440 Bracket-Armature Mtg. 1 589 93473 Screw-Slotted 1 590 93171 Screw-Slotted Hex. 1 601 93053 Clamp, Hose (Green) 1 636 92864 Washer-Lock 1 10 637 66154 Washer-Fiber 1 638 26404 Washer-Flat 1 639 270176 Gasket-Breaker Cover Included in Gasket Set-Part No. 299719 1 640 298141 Lead-Primary 1 642 221468 Cover-Air Cleaner 1 643 280001 Spacer-Air Cleaner 1 6 644 221755 Base-Air Cleaner 1 654 230783 Nut-Lock 1 670 230900 Spacer, Mounting (2) 1 722 68768 Seal-Plunger 1 723 93516 Retainer-Seal 1 10 724 221873 Retainer-Seal 1 736 93542 Nut-Hex. 1 737 93546 Screw, Hex Head Cap (5/16-18 X 1-1/4") 1 810 230950 Shaft-Stud 1
![](http://www.michaelstractors.com/forum/upload/B112/20078453426_300421_sketch1.jpg)
1 391096 Cylinder Assembly 1 5 211889 Head-Cylinder 1 6 22963 Washer, Flat 1 7 270400 Gasket-Cylinder Head Included in Gasket Set-Part No. 299719 1 8 299328 Breather 1 9 27803 Gasket-Valve Cover Included in Gasket Set-Part No. 299719 1 10 93394 Screw 1 11 68818 Tube-Breather 1 12 270448 Gasket-Cover (P.t.o Side) Included in Gasket Set-Part No. 299719 1 14 22963 Washer, Flat 1 14 92674 Screw, Hex Head Cap (2-7/16" Long) 1 14 93211 Screw, Machine Hex (5/16-18 X 2-21/32") 1 16 261218 Crankshaft 1 17 291667 Bearing, Ball 1 20 299609 Seal-Oil 1 21 66768 Plug, Oil Fill 1 24 61760 Key, Flywheel (For Breaker Ignition System) 1 25 299688 Piston Assy-Std 1 6 25 299716 Piston Assy. .010" O.S. 1 6 25 299717 Piston Assy. .020" O.S. 1 6 25 299718 Piston Assy. .030" O.S. 1 6 26 299690 Ring Set-Piston Standard Consists of: 211602 Ring-Piston, Comp., Top, Standard 211603 Ring-Piston, Comp., Center, Standard 299689 Ring-Piston, Oil, Standard (w/expander) 1 5 26 299710 Ring Set-Piston .010" O.S. Consists of: 211694 Ring-Piston, Comp., Top, .010" O.S. 211695 Ring-Piston, Comp., Center, .010" O.S. 299713 Ring-Piston, Oil, .010" O.S. (w/expander) 1 10 26 299711 Ring Set-Piston .020" O.S. Consists of: 211698 Ring-Piston, Comp., Top, .020" O.S. 211699 Ring-Piston, Comp., Center, .020" O.S. 299714 Ring-Piston, Oil, .020" O.S. (w/expander) 1 5 26 299712 Ring Set-Piston .030" O.S. Consists of: 211702 Ring-Piston, Comp., Top, .030" O.S. 211703 Ring-Piston, Comp., Center, .030" O.S. 299715 Ring-Piston, Oil, .030" O.S. (w/expander) 1 26 299745 For Chrome Piston Ring Set Standard Size 1 10 27 260924 Lock-Piston Pin 1 28 299691 Pin-Piston Std (Std.) 1 10 29 299632 Rod-Connecting For Connecting Rod with .020" undersize Crankpin Bore-order No. 390306 1 30 221777 Dipper-Connecting Rod 1 31 221776 Lock-Rod Screw 1 32 230907 Screw-Connecting Rod 1 33 261207 Valve-Exhaust 1 34 230861 Valve-Intake Used Before Code Date 7004171 1 34 261206 Valve-Intake Used After Code Date 7004161 1 35 26828 Spring, Valve (Exhaust) 1 36 26828 Spring, Valve (Exhaust) 1 40 292260 Rotocoil Assy (Exhaust Valve) 1 41 68283 Collar-Valve Spring Retainer 1 10 45 26670 Tappet-Valve 1 46 211794 Gear-Cam 1 50 211419 Manifold-Intake 1 52 27381 Gasket, Intake Elbo Included in Gasket Set-Part No. 299719 1 88 270449 Gasket-Gear Case Cover 1 123 93415 Screw-Hex (1/4-20 X 3/4) 1 201 26725 Link-Throttle 1 204 23849 Collar-Bell Crank 1 206 93422 Locknut, Hex 1 208 230040 Rod-Governor Control 1 209A 260816 Spring, Governor (2 1/2" Long) 1 209 260815 Spring-Governor 1 219 291192 Gear-Governor 1 223 22814 Lever-Governor Control 1 225 291177 Shaft-Governor Gear 1 227 298399 Lever-Governor 1 230 22826 Washer-Spacer 1 300 299477 Muffler Assy Muffler is furnished by the equipment manufacturer 1 302 91310 Locknut-Muffler 1 303 91308 Elbow, Exhaust 90 D (1" Street) 1 306 299536 Shield-Cylinder 1 308 221953 Cover-Cylinder Head 1 329 93294 Screw, Sem (5/8" Long) 1 329 93415 Screw-Hex (1/4-20 X 3/4) 1 337 298809 Spark Plug For Ignition Cable Terminal order No. 221798 1 347 220197 Switch, Stop (For 1-1/2" High, 38 Mm. Spark Plugs) 1 357 91540 Key, Pulley (1/4") 1 358 299719 Gasket Set 1 523 299385 Cap And Dipstick-Oil Filler 1 524 68838 Seal-Oil Filler Tube To Sump 1 525 299381 Pipe-Oil Filler 1 552 23837 Bushing-Governor Crank 1 553 62222 Seat-Valve Spring 1 556 90887 Screw, Hex Head Cap (3/8-16 X 1-1/4") 1 558 92268 Washer-Lock (3/8 X 1/8 X 3/32") 1 10 560 91984 Pin-Cotter 1/16 X 1/2" Long 1 562 92613 Bolt-Gov Lever 1 10 567 291364 Crank-Governor 1 10 568 298398 Base Assy.-Engine 1 569 27351 Gasket-Engine Base Included in Gasket Set-Part No. 299719 1 570 299459 Support Assy.-Bearing (P.t.o. Side) 1 571 299705 Support-Bearing (Mag. Side) 1 572 291871 Guide-Front Air 1 587 220509 Clip-Wire 1 590 93171 Screw-Slotted Hex. 1 592 90356 Nut, Hex Mach (10-24) 1 593 270513 Gasket-Brg Sup (.015" Thick) Included in Gasket Set-Part No. 299719 1 593 270514 Gasket-Brg Sup (.010" Thick) Included in Gasket Set-Part No. 299719 1 593 270515 Gasket-Brg Sup (.005" Thick) Included in Gasket Set-Part No. 299719 1 635 66538 Elbow-Spark Plug 1 645 230775 Bushing-Plunger 1 664 93415 Screw-Hex (1/4-20 X 3/4) 1 738 221944 Washer-Flat 1 739 93535 Screw, Sem Hex Head (5/16-18 X 3/4) 1 740 221990 Washer-Flat 1 741 299472 Gear Assembly-Idler 1 742 93525 Retainer-E Ring 1 743 211605 Gear-Drive 1 744 93526 Washer, Belleville 1 745 93562 Screw-Drive Gear Mounting 1 746 211631 Gear-Drive (Mag. Side) 1 747 299732 Cover Assembly-P.t.o. Side 1 748 93585 Screw, Sem Hex Head 1 749 299731 Cover Assembly-Mag. Side 1 750 93587 Screw, Sem Hex Head (1/4-20 X 1") 1 751 22355 Washer-Seal 1 752 93554 Screw-Plug 1 753 230892 Shaft-Cam Gear 1 10 754 93528 Screw-Hex. 1 755 299706 Bearing-Gear 1 10
![](http://www.michaelstractors.com/forum/upload/B112/20078453453_300421_sketch3.jpg)
169 90832 Washer-Lock 1 188 92271 Screw-Cap, Hex Hd. (5/16-18 X 1") 1 188 93535 Screw, Sem Hex Head (5/16-18 X 3/4) 1 189 90366 Lockwasher, Zinc Pl 1 192 91397 Nut, Hex (5/16-18) 1 305 93158 Screw, Sem Hex Head (1/4-20 X 5/8") 1 323A 68898 Belt-Vee (For Low Position Mtg.) 1 323 68878 Belt-Vee (For High Position Mtg.) 1 328 222062 Guard-Belt 1 478 221745 Panel-Instrument 1 492 297779 Starter-Gen (Delco-Remy #1101864 & Pulley-Delco-Remy #1949358) 1 493A 211169 Bracket-Starter 1 493 211617 Bracket-Upper Starter Used Before Code Date 6804201 1 493 211785 Bracket-Upper Starter Used After Code Date 6804191 1 500 91325 Washer-Plain 1 501A 295924 Regulator (Flat Mount, Delco-remy) 1 501 297196 Regulator (Saddle Mount, Delco-remy) 1 558 92268 Washer-Lock (3/8 X 1/8 X 3/32") 1 10 561 92278 Nut, Hex (1/4-20) 1 565 93142 Screw-Hex 1 574 295158 Ammeter 1 10 575 299139 Switch, Starter Grp 1 576A 295160 Wire/Ammeter 1 576 298579 Wire Assembly (Ignition Switch to Indicator Lamp) 1 577A 295161 Wire/Ammeter (Ammeter To Regulator) 1 577 298582 Wire Assembly (Starter Switch to Ign Switch & Bat on Regulator) 1 578A 295162 Wire/Switch 1 578 298583 Wire Assembly (To Generator Term, Regulator & Indicator Light Term) 1 605A 297171 Bracket-Support (Lower) 1 606A 221442 Strap-Adjusting 1 606 221931 Strap-Adjusting 1 646A 221472 Bracket-Support 1 10 646 221932 Bracket/Starter 1 647 211170 Link-Anchor 1 648 91439 Screw-Cap, Hex. Head 1/4-20 X 3/8" 1 649 93546 Screw, Hex Head Cap (5/16-18 X 1-1/4") 1 650 91814 Screw-Hex (3/8-16 X 2") 1 651 92034 Screw-Hex (5/16-18 X 1/2") 1 652 91162 Screw, Hex Head Cap (5/16-18 X 1-1/2") 1 653 91442 Screw-Pulley Mtg. 1 661 91203 Screw, Hex Head Cap (5/16-18 X 1-3/4") 1 664 93415 Screw-Hex (1/4-20 X 3/4) 1 669 222067 Bracket-Guard 1 694 91324 Washer 1 737 93546 Screw, Hex Head Cap (5/16-18 X 1-1/4") 1 762 390048 Starter Kit-Elec 12 Volt 1 795 298590 Switch-Toggle 1 805 93593 Clip-Nut (Belt Guard Brkt Mtg) 1 824 298586 Holder-Lamp 1 825 67245 Lamp-Chrg Indicator (#1893 T3-1/4 Bulb, Miniature Bayonet Base, 12V) 1 826 298580 Wire Assembly (Ignition Switch To Ground) 1 827 298581 Wire-Ignition Switch To Ground 1 840 298561 Panel Kit 1 841 297197 Clamp-Regulator To Generator 1
![](http://www.michaelstractors.com/forum/upload/B112/2007845354_300421_partlist1.jpg)
![](http://www.michaelstractors.com/forum/upload/B112/20078453517_300421_partlist2.jpg)
![](http://www.michaelstractors.com/forum/upload/B112/20078453530_300421_partlist3.jpg)
![](http://www.michaelstractors.com/forum/upload/B112/20078453543_300421_partlist4.jpg)
![](http://www.michaelstractors.com/forum/upload/B112/20078453558_300421_partlist5.jpg)
![](http://www.michaelstractors.com/forum/upload/B112/20078453626_300421_partlist6.jpg)
Note: The 295924 Regulator (Flat Mount, Delco-remy) is crossreferenced to model 1118988 Delco-Remy.
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