CH20-64500 Page 1 of 30
Air Intake - Pg. 51
Ref # Part Number Qty Description
1 24 164 14-S Manifold, intake1
2 M-0639055 Screw, hex. flange M6x1.0x554
3 24 041 01-S Gasket, intake manifold2
4 24 041 06-S Gasket, air cleaner base1
5 24 094 03-S Base, air cleaner1
6 24 126 23-S Bracket, air cleaner (20 mm stud) Use before Serial No.
1
2422900017
7 M-0639016 Screw, hex. flange M6x1.0x163
8 47 083 03-S Element, air cleaner1
9 24 083 02-S Element, precleaner1
10 24 096 01-S Cover, inner air cleaner1
11 24 032 03-S Seal, inner - air cleaner1
12 12 100 01-S Nut, wing1
CH20-64500 Page 2 of 30
Air Intake - Pg. 51
13 24 380 03-S Pin, latch lever Use before Serial No. 24229000172
14 24 344 01-S Latch, lever Use before Serial No. 24229000172
15 24 089 04 Spring, latch Use before Serial No. 24229000172
16 24 096 03 Cover, air cleaner Use before Serial No. 2422900017, for
1
reference only, no longer available separately. Replaced by
24-743-05.
18 24 109 03 Cup, fuel spitback 27.5 mm stud CV18-251
19 24 126 21-S Bracket, air cleaner 30 mm stud CH18-221
20 24 743 05-S Kit, air cleaner cover Includes 18,19,21-23. Use before
1
Serial No. 2422900017; after Serial No. 2422900007, or after
installation of kit, individual kit components may be ordered
for replacement
21 24 096 24-S Cover, air cleaner1
22 24 755 91 Kit, air cleaner knob w/gasket Includes 231
23 25 341 02 Knob, air cleaner cover1
CH20-64500 Page 3 of 30
Blower Housing & Baffles - Pg. 32
Blower Housing & Baffles - Pg. 32
Ref # Part Number Qty Description
1 24 027 20-S Housing, blower Includes 2-41
2 24 100 01-S Nut, plastic3
3 24 100 02-S Nut, plastic2
4 25 139 16-S Plug, button 9/16"1
5 M-0545016 Screw, hex. flange M5x0.8x165
6 M-0545020 Screw, hex. flange M5x0.8x202
7 M-0551016 Screw, hex. flange M5x0.8x161
8 24 146 02 Plate, backing - #2 side1
9 M-0645016 Screw, hex. flange M6x1.0x166
10 24 063 20-S Baffle, cylinder barrel - #2 side1
11 24 063 17-S Baffle, valley - #2 side1
12 24 063 24-S Baffle, valley - #1 side1
13 M-0545010 Screw, hex. flange M5x0.8x102
14 24 063 21 Baffle, cylinder barrel - #1 side Replaced by 24-063-301
15 24 146 08 Plate, backing - #1 side1
CH20-64500 Page 4 of 30
CH20-64500 Page 5 of 30
Crankcase
Ref # Part Number Qty Description
1 Crankcase (Service with Short Block or Miniblock. Refer to
1
Selection Guide TP-2470)
3 12 380 03 Pin, dowel locating6
4 52 139 09-S Plug, cup1
5 24 032 01-S Seal, oil front1
6 24 144 01-S Shaft, governor cross1
7 X-25-102-S Washer, plain 1/4"1
8 12 032 01-S Seal, governor cross shaft1
9 X-25-63-S Washer, plain 1/4"1
10 12 380 04-S Pin, hitch1
13 24 067 01 Connecting Rod (Std.) Replaced by 24-067-052
13 24 067 02 Connecting Rod (.25) To be replaced by 24-067-062
14 24 874 01-S Piston w/Ring Set (Std.) Includes 15,162
CH20-64500 Page 6 of 30
Crankcase
14 24 874 02-S Piston w/Ring Set (.25) Includes 15,162
14 24 874 03-S Piston w/Ring Set (.50) Includes 15,162
15 24 018 01-S Retainer, piston pin4
16 24 108 01-S Ring Set (Std.)2
16 24 108 02-S Ring Set (.25)2
16 24 108 03-S Ring Set (.50)2
17 12 422 07-S Shim, camshaft (A.R.) (white) (.02725 - .02875)1
17 12 422 08-S Shim, camshaft (A.R.) (blue) (.02925 - .03075)1
17 12 422 09-S Shim, camshaft (A.R.) (red) (.03125 - .03275)1
17 12 422 10-S Shim, camshaft (yellow) (.03325 - .03475)1
17 12 422 11-S Shim, camshaft (A.R.) (green) (.03525 - .03675)1
17 12 422 12-S Shim, camshaft (A.R.) (gray) (.03725 - .03875)1
17 12 422 13-S Shim, camshaft (A.R.) (black) (.03925 - .04075)1
18 24 012 05 Camshaft1
28 52 139 02-S Plug, hex. hd. 3/8" N.P.T.F.2
CH20-64500 Page 7 of 30
Crankshaft
Ref # Part Number Qty Description
1 24 014 04-S Crankshaft Includes 21
2 52 139 09-S Plug, cup Use on engines with New Design - 16.88 mm,
1
5/8" diameter
2 12 139 01-S Plug, cup Use on engine with Original Design - 11.40 mm,
1
7/16" diameter
CH20-64500 Page 8 of 30
Crankshaft
CH20-64500 Page 9 of 30
Engine Controls - Pg. 47
Ref # Part Number Qty Description
1 M-0547050 Nut, hex. flange M5x0.81
2 24 089 03-S Spring, choke return1
3 25 452 13-S Terminal1
4 M-0645016 Screw, hex. flange M6x1.0x164
6 24 126 13 Bracket, control1
7 12 237 01-S Clamp, cable2
8 SM-0545016 Screw, hex. flange M5x0.8x163
9 24 468 01-S Washer, plain 5 mm3
10 24 090 07-S Lever, throttle actuator1
11 M-0446030 Nut, hex. flange M4x0.72
12 24 090 03-S Lever, throttle control1
13 M-0401030 Screw, hex. cap M4x0.7x302
14 24 090 05-S Lever, choke1
15 24 079 02-S Linkage, choke1
CH20-64500 Page 10 of 30
Engine Controls - Pg. 47
16 41 468 03-S Washer, wave1
17 SM-0545020 Screw, hex. flange M5x0.8x201
18 24 089 01-S Spring, linkage1
19 24 090 14-S Lever, governor1
20 24 089 15-S Spring, governor1
21 M-0641060 Nut, hex. flange M6x1.01
22 M-0642025 Screw, hex. cap M6x1.0x251
23 25 158 11-S Bushing, linkage - black1
24 24 079 01-S Linkage, throttle1
25 25 158 08-S Bushing, linkage - natural1
CH20-64500 Page 11 of 30
Exhaust - Pg. 70
Ref # Part Number Qty Description
1 M-0829033 Stud, exhaust M8x1.25x334
CH20-64500 Page 12 of 30
Exhaust - Pg. 70
CH20-64500 Page 13 of 30
Fuel System - Pg. 41
Ref # Part Number Qty Description
1 25 353 10-S Line, fuel 9"2
2 X-426-9-S Clamp, hose6
3 25 050 03-S Filter, fuel Replaced by 24-050-021
5 24 353 02-S Line, fuel 15-1/2"1
6 24 086 12-S Screw, hex. cap 18 mm2
7 24 393 04 Pump, fuel - pulse1
8 24 100 01-S Nut, plastic2
11 47 154 01-S Clip Order qty. according to design used on engine1
12 M-0650012 Screw, hex. flange M6x1.0x101
13 M-0651030 Screw, hex. flange M6x1.0x302
14 24 853 02 Kit, carburetor Includes 15-17, carburetor assembly
1
24-053-02
CH20-64500 Page 14 of 30
14 24 853 32-S Kit, carburetor Includes 15-17, carburetor assembly
1
Fuel System - Pg. 41
24-053-32
15 24 041 06-S Gasket, air cleaner1
16 24 041 17-S Gasket, carburetor1
17 24 053 02 Carburetor assembly Includes 20-41, carburetor repair kit
1
24-757-03, high altitude kits 24-755-01 & 24-755-02
17 24 053 32 Carburetor assembly Includes 20-41, carburetor repair kit
1
24-757-03, high altitude kits 24-755-01 & 24-755-02
20 24 086 09-S Screw, sems pan hd. M4x0.7x164
21 24 041 09-S Gasket, carburetor body1
22 24 153 02-S O-Ring, slow jet2
23 24 337 01-S Jet, slow1
24 24 757 02-S Kit, float repair1
25 24 462 01-S Valve, inlet needle1
26 24 154 01-S Clip, inlet needle valve1
27 24 757 07-S Kit, choke repair Includes 281
28 24 173 02-S Cap, choke lever1
29 24 089 10-S Spring, idle speed adjusting1
30 24 086 10-S Screw, idle speed adjusting1
31 24 153 03-S O-Ring, main jet screw1
32 24 337 02-S Screw, main jet1
33 24 089 11-S Spring, idle adjusting1
34 24 368 01-S Needle, idle adjusting1
35 24 757 01-S Kit, solenoid assembly Includes 36-411
36 24 153 06-S O-Ring, solenoid1
37 24 521 01-S Seat, solenoid1
38 24 153 05-S O-Ring, solenoid1
39 24 153 04-S O-Ring, solenoid1
40 24 435 01-S Solenoid1
41 24 086 07-S Screw, sems pan hd. M4x0.7x82
CH20-64500 Page 15 of 30
Gasket Set
Ref # Part Number Qty Description
24 755 107-S Gasket Set1
24 050 01-S Filter, breather1
24 041 06-S Gasket, air cleaner base1
24 041 14-S Gasket, air cleaner base1
24 041 23-S Gasket, breather1
24 041 15-S Gasket, carburetor1
24 041 17-S Gasket, carburetor1
24 041 53-S Gasket, carburetor - plastic intake manifold1
24 041 08-S Gasket, cylinder head2
24 041 02-S Gasket, exhaust2
24 041 13-S Gasket, fuel spitback cup1
24 041 01-S Gasket, intake manifold2
24 041 29-S Gasket, oil filter adapter1
24 100 10-S Nut, hex. flange M8x1.258
CH20-64500 Page 16 of 30
Gasket Set
24 153 01-S O-Ring 11 mm I.D.1
24 153 08-S O-Ring 14 mm I.D.1
12 153 01-S O-Ring 16 mm I.D.1
25 153 02-S O-Ring 23 mm I.D.1
12 153 02-S O-Ring 35 mm I.D.1
24 153 21-S O-Ring 71 mm I.D.1
24 153 27-S O-Ring, plastic intake manifold2
24 153 23-S O-Ring, valve cover2
24 018 09-S Retainer, ring1
12 086 16-S Screw, hex. flange M10x1.5x908
24 032 04-S Seal 2 1/4" long1
230046-S Seal, breather1
24 032 01-S Seal, front oil1
12 032 01-S Seal, governor cross shaft1
24 032 03-S Seal, inner air cleaner - 1/4" long1
52 032 08-S Seal, rear oil1
66 032 05-S Seal, valve stem2
24 072 09-S Stud, cylinder head, M8x1.25x20, M10x1.5x33, 105 mm
8
long
24 468 16-S Washer, flat 8 mm8
CH20-64500 Page 17 of 30
Head/Valve/Breather - Style "A"
Head/Valve/Breather - Style "A"
Ref # Part Number Qty Description
1 24 755 75-S Kit, valve cover - oil fill Includes 2-51
2 24 153 12 O-Ring2
3 24 153 09-S O-Ring1
4 24 086 32-S Screw, hex. cap - shoulder M6x1.0x238
7 25 755 13-S Kit, oil fill cap Includes 81
8 12 153 03-S O-Ring1
9 24 445 01-S Strap, lifting1
10 M-0640034 Screw, hex. flange M6x1.0x344
11 24 755 61 Kit, valve train Includes 12-15,39. For individual component
1
reference only, before Serial No. 2520800017. Replaced by
24-755-66
12 24 146 09 Plate, guide Use before Serial No. 2520800017. Replaced
1
CH20-64500 Page 18 of 30
by 24-755-66
13 M-0631005 Washer, plain 6 mm Use before Serial No. 25208000171
14 24 186 03 Arm, rocker Use before Serial No. 25208000174
15 24 194 02 Pivot, rocker arm Use before Serial No. 2520800017.
4
Replaced by 24-755-66
16 12 086 16-S Screw, hex. flange M10x1.5x918
17 24 016 01-S Valve, exhaust (Std.)2
17 24 016 02-S Valve, exhaust (.25 O.S.)2
18 24 318 09-S Head assembly, #1 cylinder1
19 235011-S Retainer, spring4
20 24 089 02-S Spring, valve4
21 12 173 01-S Cap, valve spring4
22 12 755 03-S Kit, retainer4
23 24 032 05-S Seal, valve stem2
24 24 017 01-S Valve, intake (Std.)2
24 24 017 02-S Valve, intake (.25 O.S.)2
25 24 755 74-S Kit, valve cover - plain Includes 2,4,51
26 24 402 03-S Reed, breather1
27 12 018 01-S Retainer, breather reed1
28 M-0545010 Screw, hex. flange M5x0.8x101
29 24 050 01-S Filter, breather1
30 24 033 01-S Kit, breather w/plug Includes 31,321
31 X-75-23-S Plug, allen hd. 1/8"1
32 24 041 23-S Gasket, breather1
33 X-426-9-S Clamp, hose1
34 24 326 06 Hose, breather1
35 M-0645020 Screw, hex. flange M6x1.0x204
37 24 318 10-S Head assembly, #2 cylinder1
38 24 041 08-S Gasket, cylinder head2
39 24 411 04 Rod, push Use after Serial No. 2424400007. Replaced by
4
24-755-66
40 12 351 01 Lifter, valve4
CH20-64500 Page 19 of 30
Head/Valve/Breather - Style "B"
Head/Valve/Breather - Style "B"
Ref # Part Number Qty Description
1 24 755 75-S Kit, valve cover - oil fill Includes 2-51
2 24 153 12 O-Ring2
3 24 153 09-S O-Ring1
4 24 086 32-S Screw, hex. cap - shoulder M6x1.0x238
7 25 755 13-S Kit, oil fill cap Includes 81
8 12 153 03-S O-Ring1
9 24 445 01-S Strap, lifting1
10 M-0640034 Screw, hex. flange M6x1.0x344
37 24 318 10-S Head assembly, #2 cylinder1
38 24 041 08-S Gasket, cylinder head2
40 12 351 01 Lifter, valve4
42 24 755 66-S Kit, valve train Includes 43-45. Use before Serial No.
1
CH20-64500 Page 20 of 30
2520800017, after Serial No. 2520800007 or after installation
of kit, individual marked* components can be ordered for
replacement.
43 24 599 01-S Pivot, cylindrical rocker arm1
44 25 186 01-S Arm, rocker1
45 24 411 05-S Rod, push1
CH20-64500 Page 21 of 30
Ignition/Electrical - Pg. 23
Ref # Part Number Qty Description
1 24 085 01 Stator (15 amp)1
2 M-0548025 Screw, hex. cap M5x0.8x252
3 24 584 01-S Module, ignition2
4 SM-0545020 Screw, hex. flange M5x0.8x204
5 24 025 01-S Flywheel1
6 X-42-15-S Key1
7 12 468 03-S Washer, plain 3/8"1
8 12 086 14-S Screw, hex. flange M10x1.5x761
9 24 157 01-S Fan1
10 12 112 01 Spacer, fan4
11 M-0639016 Screw, hex. flange M6x1.0x164
12 24 162 03-S Screen, grass1
14 X-25-92-S Washer, plain 1/2"2
16 12 132 02-S Spark plug2
CH20-64500 Page 22 of 30
Ignition/Electrical - Pg. 23
17 25 403 03-S Rectifier-regulator (15 amp)1
18 24 086 18-S Screw, hex. cap M10x1.5x612
19 236602-S Connector (3 contact)1
20 X-25-63-S Washer, plain 1/4"2
21 235173-S Clip1
22 48 154 02-S Clip1
Harness, wiring Before Serial No. 2307000014 use:1
Harness, wiring After Serial No. 2307000004 use:1
24 518 04 Lead, green, rectifier-regulator 4" - 18 gauge - terminals: 2
1
insulated grip barrel eyelets
24 518 06-S Lead, black 6" - 14 gauge - terminals: 1 uninsulated push on
1
tab, 1 insulated grip barrel eyelet. Use after Serial No.
2329500004
CH20-64500 Page 23 of 30
Ignition/Electrical - Pg. 27
Ref # Part Number Qty Description
1 24 085 01 Stator (15 amp)1
2 M-0548025 Screw, hex. cap M5x0.8x252
5 24 025 01-S Flywheel1
6 X-42-15-S Key1
7 12 468 03-S Washer, plain 3/8"1
8 12 086 14-S Screw, hex. flange M10x1.5x761
9 24 157 01-S Fan1
10 12 112 01 Spacer, fan4
11 M-0639016 Screw, hex. flange M6x1.0x164
14 X-25-92-S Washer, plain 1/2"2
16 12 132 02-S Spark plug2
17 25 403 03-S Rectifier-regulator (15 amp)1
18 24 086 18-S Screw, hex. cap M10x1.5x612
19 236602-S Connector (3 contact)1
CH20-64500 Page 24 of 30
Ignition/Electrical - Pg. 27
38 24 018 03-S Retainer3
43 15 155 01-S Connector Use after Serial No. 23295000041
44 277563-S Connector Use after Serial No. 23070000041
48 25 155 06-S Connector1
Harness, wiring Before Serial No. 2307000014 use:1
Harness, wiring After Serial No. 2307000004 use:1
24 518 04 Lead, green, rectifier-regulator 4" - 18 gauge - terminals: 2
1
insulated grip barrel eyelets
24 518 06-S Lead, black 6" - 14 gauge - terminals: 1 uninsulated push on
1
tab, 1 insulated grip barrel eyelet. Use after Serial No.
2329500004
CH20-64500 Page 25 of 30
Oil Pan/Lubrication - Pg. 25
Ref # Part Number Qty Description
1 24 009 82-S Plate assembly, closure Includes 2-10,13,151
2 52 032 08-S Seal, oil (PTO end)1
3 24 153 08-S O-Ring1
4 12 144 02-S Shaft, governor gear1
5 52 448 02-S Tab, locking1
6 24 043 12-S Kit, governor gear w/pin Includes 71
7 12 380 01-S Pin, governor regulating1
8 24 393 03-S Oil pump assembly Reference No. 24-327-02 stamped on
1
housing. Includes 9,10
8 24 393 10-S Oil pump assembly Reference No. 24-327-03 stamped on
1
housing. Includes 9,10
9 24 153 01-S O-Ring1
10 24 381 03-S Pick-up, oil Use with pump assembly 24-393-031
CH20-64500 Page 26 of 30
Oil Pan/Lubrication - Pg. 25
10 24 381 04-S Pick-up, oil Use with pump assembly 24-393-101
11 M-0631005 Washer, plain 6 mm2
12 M-0645025 Screw, hex. flange M6x1.0x252
13 24 123 08-S Tube, dipstick (bent tube)1
15 24 038 06-S Dipstick1
20 24 136 01-S Nipple, oil filter1
21 12 050 01-S Filter, oil1
22 24 086 16-S Screw, hex. flange M8x1.25x4610
23 25 155 02-S Connector, hose 90ΓΈ 1/4"1
24 52 099 06 Switch, oil pressure1
CH20-64500 Page 27 of 30
Starting System - Pg. 37
Ref # Part Number Qty Description
13 M-0841080 Nut, hex. flange M8x1.251
14 M-0839080 Screw, hex. flange M8x1.25x80.62
15 12 098 03-S Starter, solenoid shift Includes 16-32. Use before Serial No.
1
2309800017
16 52 211 05-S Bolt, thru M5x0.8x992
17 12 301 01-S Cap, commutator end1
18 52 168 01-S Insulator1
19 52 089 09-S Spring, brush4
20 52 323 03-S Holder, brush1
21 52 221 01-S Kit, brush Includes 191
22 12 471 01-S Frame1
23 52 100 09-S Nut, starter1
24 52 435 02-S Solenoid1
CH20-64500 Page 28 of 30
Starting System - Pg. 37
25 12 170 03-S Armature1
26 12 239 01-S Pinion, drive1
27 52 100 08 Nut, stop collar2
28 52 141 03 Ring, retainer1
29 52 468 14 Washer, thrust1
30 12 090 10-S Lever, starter drive1
31 12 081 02-S Cap, drive end1
32 52 100 10-S Nut, starter2
CH20-64500 Page 29 of 30
Starting System - Pg. 38
Ref # Part Number Qty Description
13 M-0841080 Nut, hex. flange M8x1.251
14 M-0839080 Screw, hex. flange M8x1.25x80.62
33 24 098 01-S Starter, solenoid shift Includes 34-50. Use after Serial No.
1
2309800007, but before Serial No. 2509000017
34 52 211 05-S Bolt, thru M5x0.8x992
35 24 301 01-S Cap, commutator end1
36 52 168 01-S Insulator1
37 52 089 09-S Spring, brush4
38 52 323 03-S Holder, brush1
39 52 221 01-S Kit, brush1
40 12 471 01-S Frame1
41 52 100 09-S Nut, starter1
42 52 435 02-S Solenoid1
CH20-64500 Page 30 of 30
Starting System - Pg. 38
43 12 170 03-S Armature1
44 12 239 01-S Drive pinion1
45 52 100 08 Nut, stop collar Replaced by 82-755-842
46 52 141 03 Ring, retainer Replaced by 82-755-841
47 52 468 14 Washer, thrust Replaced by 82-755-841
48 12 090 10-S Lever, starter drive1
49 24 081 04-S Cap, drive end1
50 52 100 10-S Nut, starter2
51 24 098 01-S Starter, solenoid shift Includes 34-44,48-50,52. Use after
1
Serial No. 2509000007
52 82 755 84 Kit, starter repair1
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