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12 NP 38" RiDiNG LAWN TRACTOR - ° MODEL NUMBER 917.254520
ENGINE BRIGGS & STRATTON =MODEL NUMBER 281707, TYPE NUMBER 0412=01
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PART DESCRiPTiON KEY PART
NO. NO. NO.
93705 Screw-Hex Head 57 291675
223752 Guard-Flywheel 58 490452
490854 Housing-Blower 59 271916
93158 Screw-Blower Housing Mounting
Sem 271996
93535 Screw-Sem (3/4" Long)
223726 Retainer-Fan 271997
280687 Fan-Flywheel
398525 Insulator Assembly 60 292260
92791 Washer Lock- Shakeproof 61 93630
93722 Terminal-Spade 62 26828
90576 Nut-Hex. 8-32 63 262246
26157 Spring-Throttle Adjustment 64 262247
90200 Screw-Machine, Fill. Hd. 8-32 x t/2" 65 65906
93572 Screw-Carburetor 66 22! 596
491594 Plate-Governor Control (Choke-A- 67 262248
Matic) 68 262135
260695 Spring Governor 69 490466
221535 Clamp Casing
93496 Screw-Sem
262348 Link Governor 70 262243
260584 Spring Governor Link 71 94160
492325 Flywheel and Ring Gear Assy,- 72 394661
Magneto 394662
399676 Gear-Ring (Includes Mounting 394663
Parts) 394664
261623 ** Bearing Cylinder 73 394665
391086 Seal Oil 392331
490450 Cylinder Assembly 39! 781
231597 Bushing-Governor Crank (1/4" I.D.) 391782
491323 Seal-Oil 391783
93307 Retainer-E-Ring 74 260924
93306 Cotter Hair Pin 75 299691
222450 Washer-Governor Crank (1/4" t.D.) 391286
231058 Crank-Governor(l/4" dia.) 76 490348
490927 Lever Assy,-Governor (For 1/4" dia. 490469
Crank)
92613 Bolt Governor Lever 77 92909
231082 Nut-Hex, 10-24 78 222299
212359 Link-Counterweight 79 89838
93875 Screw-Counterweight (1) 80 66538
298909 ,Pin Counterweight (1) 81 93723
399891 Counterweight Assembly 82 802592
491255 Decal (Label) Kit
490525 Gasket Set 83 491491
490815 Oil Slinger, Governor Gear and 84 491490
Bracket Assembly 85 261961
27803 * Gasket-Valve Cover 231218
391406 Breather Assembly
280100 Tube-Breather 86 210940
93394 Screw-Sem 87 261463
490327 Cap and Dipstick-Oi! Filler 88 271866
270920 Seal-Oil Filler Cap 89 223715
93304 Screw Clamp Mtg. 90 93163
223721 Clamp-Oil Filler Tube 91 398808
490474 Fill Group Oil 92 492341
280741 Tube-Oil Filler 93 93381
68838 Seal-Filler Tube 94 19203
222698 Key Flywheel 95 221798
212897 Gear-Cam
94305 Screw-Base Mounting Sem
91084 Plug Fill Drain
DESCRIPTION
Seal-Oil
Base-Engine
* Gasket-Crankcase Cover-!/64"
thick
* Gasket-Crankcase Cover-.005"
thick
* Gasket-Crankcase Covero.009"
thick
Rotocoil Exhaust Valve
Retainer-Exhaust Valve Rotocoil (2)
Spring-Exhaust Valve
Valve-Exhaust
Valve-Intake
Spring-Intake Valve
Retainer-Intake Valve
Tappet-Valve
Gear-Timing
Crankshaft
NOTE: Order Part Number 94196
For Timing Gear Key
Eccentric
Pin-Eccentric
Piston Assy.-Standard
Piston Assy.-010" O.S.
Piston Assy,-,020" OS.
Piston Assy.-.030" O.S.
Ring Set-Piston Std.
Chrome Ring Set-Standard Size
Ring Set-Piston-.010" O.S.
Ring Set-Piston-.020" O.S.
Ring Set-Piston-.030" O.S,
Lock-Piston Pin
Pin Assembly-Piston-Standard
Pin Assembly-Piston-.005" O.S.
Rod Assembly-Connecting
Connecting Rod with .020"
Undersize Crank Pin Bore,
Screw-Connecting Rod
Lock-Connecting Rod-Screw
Wrench-Spark Plug
Elbow-Spark Plug
Screw Cylinder Head (3" long),
Plug Spark (Resistor Type) (1-1/2"
high)
Head-Cylinder
Cover-Cylinder Head
Guide-Exhaust Valve
Guide-Intake Valve (Brass)
See Repair Manual
Seat-Exhaust Valve (Standard)
Seat-Intake Valve (Standard)
* Gasket Cylinder Head
Shield-Cylinder
Screw Cylinder Shield Mtg, Sem
Wire-Ground
Armature-Magneto
Screw-Armature Mounting Sem
Puller Flywheel
Termina!-Ignition Cable
* Included in Gasket Set--Part No. 490525
** Requires Special tools for Installation
NOTE: All component dimensions given in U.S. inches.
1 inch = 25.4 mm
43
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