M18-24521 Page 1 of 40
Air Intake
Ref # Part Number Qty Description
1 X-276-7-S Wing nut 1/4-202
2 52 082 02-S Cover, air cleaner - square1
3 52 032 01-S Seal, air cleaner cover1
4 231032-S Seal, element cover2
5 52 082 03-S Cover, air cleaner element1
6 52 083 01-S1 Precleaner1
7 47 083 01-S1 Element, air cleaner1
8 X-67-83-S Screw, hex. wash. hd. 1/4-20x7/16"1
9 52 201 07-S Base, air cleaner1
11 25 041 06-S Gasket, air cleaner elbow1
12 52 754 03-S Kit, air intake elbow Includes 11,311
13 X-22-9-S Washer, I.T. #102
14 X-50-57-S Screw, sltd. pan hd. 10-32x1-1/2"2
15 X-50-37-S Screw, sltd. pan hd. 10-32x2-1/4"1
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Air Intake
16 X-25-79-S Washer, plain #101
17 52 055 04-S Gasket, air cleaner1
18 X-352-38-S Stud 1/4-20x4-3/4"1
31 X-67-62-S Screw, hex. wash. hd. 1/4-20x3/4"1
25 113 07-S Decal, air cleaner NOT ILLUSTRATED1
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Baffles & Shroud
Ref # Part Number Qty Description
7 52 124 23-S Baffle, #1 cylinder head (6-1/8" wide with 3" wide rear
10 X-67-83-S Screw, hex. wash. hd. 1/4-20x7/16"20
11 52 063 21-S Baffle, #2 cylinder head (8-3/4" wide with 2-59/64" wide rear
12 52 063 01-S Baffle, fuel pump1
13 52 086 11-S Screw, hex. wash. hd. 1/4-20x5/8"2
14 52 468 16-S Washer, flat2
22 52 217 01-S Bracket, upper housing1
27 52 755 70-S Kit, blower housing Includes 10 [qty. 3],13 [qty. 2],14 [qty.
1
cylinder baffle)
1
cylinder baffle)
1
2],22
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Baffles & Shroud
M18-24521 Page 5 of 40
Breather & Vent
Ref # Part Number Qty Description
1 52 326 06-S Hose, breather 3-5/8"1
2 X-81-1-S Nut, hex. 1/4-202
3 X-25-12-S Washer, plain 1/4"2
4 52 096 08-S Cover, #1 upper cylinder valve1
5 52 055 01-S Gasket, valve cover3
6 231419-S Filter, breather1
7 52 032 04-S Seal, breather1
8 52 462 01 Valve, umbrella1
9 52 096 22 Cover, #1 lower cylinder valve1
10 275220-S Stud, #1 cylinder valve cover - 1/4-20x3-1/4"1
11 X-352-39-S Stud, #2 cylinder valve cover - 1/4-20x2-1/4"1
12 52 096 18 Cover, #2 cylinder valve1
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Breather & Vent
M18-24521 Page 7 of 40
Camshaft & Valves
Ref # Part Number Qty Description
3 82 755 13-S Kit, camshaft Includes 1, 52 019 03-S [qty. 4]1
4 41 755 10-S Kit, retainer4
5 25 089 01-S Spring, intake valve2
6 52 032 13-S Seal, intake valve stem2
7 52 017 08-S Valve, intake2
8 82 755 11-S Kit, exhaust valve Includes 52 031 01-S valve seat insert2
9 25 089 01-S Spring, exhaust valve2
10 52 413 01-S Rotator, .03" exhaust valve2
12 230011-S Retainer, intake valve spring2
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Camshaft & Valves
M18-24521 Page 9 of 40
Carburetor (Pg 20)
Ref # Part Number Qty Description
1 52 853 07 Kit, fixed jet carburetor Includes 3,11-14, Carburetor
1
assembly 52-053-26*, 52-053-31*, 52-053-36* ( - or use - )
52 853 23-S Kit, adjustable jet carburetor Includes 3,11-14, Carburetor
1
assembly 52-053-50* or 52-053-66*
2 25 155 02-S Connector, 90ΓΈ hose For 1/4" I.D. rubber hose1
3 271030-S Gasket, carburetor1
4 X-6-8-S Screw, H.C. 5/16-18x2-3/4"4
5 X-21-1-S Washer, lock 5/16"4
6 52 041 09-S Gasket, intake manifold2
7 X-77-2-S Nut, hex. jam 5/16-182
8 X-352-37-S Stud 5/16-18x1"2
9 52 164 10-S Manifold, intake1
10 52 445 02-S Strap, lifting2
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Carburetor (Pg 20)
11 25 041 06-S Gasket, air cleaner1
12 82 755 07-S Kit, governor linkage Includes 131
13 25 158 09 Bushing Replaced by 25 158 11-S1
14 52 186 06-S Arm, governor1
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Crankcase
Ref # Part Number Qty Description
1 82 755 16-S Kit, cylinder barrel #1 Includes 3,4 and exhaust valve1
2 82 755 17-S Kit, cylinder barrel #2 Includes 3,4 and exhaust valve1
3 52 316 06 Guide, valve4
4 52 031 01-S Insert, valve seat4
5 X-82-2-S Nut, hex. 5/16-1812
6 52 468 12-S Washer, flat 5/16"12
9 25 086 10-S Screw, hex. flange 5/16-18x1-1/2"3
10 X-583-5-S Seal, rear oil 1-3/8" I.D.1
11 X-802-9-S Screw, hex. flange 5/16-18x1"9
12 52 755 56-S Kit, closure plate Includes 131
13 X-75-23-S Plug, hex. ctsk. 1/8" N.P.T.F.1
15 52 755 50-S Kit, oil relief Includes ball, spring & sleeve1
20 25 086 12-S Screw, hex. flange 5/16-18x2"2
21 X-75-10-S Plug, solid sq. hd. 3/8" N.P.T.F.1
M18-24521 Page 12 of 40
Crankcase
22 52 032 10-S Seal, front oil1
23 52 030 10-S Bearing, sleeve flange (Std.)2
23 52 030 11-S Bearing, sleeve flange (.010)2
23 52 030 12-S Bearing, sleeve flange (.020)2
28 X-75-32-S Plug, hex. ctsk. 3/8" N.P.T.F.2
31 X-67-64-S Screw, hex. wash. hd. 10-32x7/16"1
32 52 139 08-S Plug 3/4" O.D.1
33 52 141 02-S O-Ring1
34 X-702-15-S Plug, cup 5/16"1
37 52 237 05-S Clamp, tube1
41 52 123 10 Tube, oil pickup1
42 52 078 05-S Shaft, governor1
43 X-269-43-S Ring, retaining1
44 25 086 13-S Screw, hex. flange 3/8-16x3-5/8"2
45 25 086 11-S Screw, hex. flange 5/16-18x3-1/2"8
46 52 072 12-S Step stud 5/16-18x3/4", 3/8-16 x 5/8", 2" long12
47 52 095 03 Housing, oil strainer1
48 52 237 02-S Clamp, spring1
M18-24521 Page 13 of 40
Crankshaft
Ref # Part Number Qty Description
1 52 014 79-S Crankshaft (1" dia. x 2-3/4" tapped PTO)1
2 52 468 03-S Washer, thrust .119/.122A.R.
2 52 468 04-S Washer, thrust .128/.131A.R.
2 52 468 05-S Washer, thrust .137/.140A.R.
M18-24521 Page 14 of 40
Crankshaft
M18-24521 Page 15 of 40
Cylinder Head
Ref # Part Number Qty Description
1 52 041 20-S Gasket, cylinder head2
3 52 015 08-S Head, cylinder2
6 41 086 02-S Screw, hex. hd. 5/16-18x1-1/2"18
7 220534-S Washer, plain 5/16"18
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Cylinder Head
M18-24521 Page 17 of 40
Dipstick
Ref # Part Number Qty Description
1 52 038 04-S Dipstick 11-5/16" blade1
2 52 123 09-S Tube, oil level1
3 X-67-64-S Screw, hex. wash. hd. 10-32x7/16"1
4 52 154 01-S Clip, tube1
5 52 173 01-S Cap, pipe1
6 46 136 02-S Pipe, 1" N.P.T.F. x 3"1
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Dipstick
M18-24521 Page 19 of 40
Electric Start - Pg. 33
Ref # Part Number Qty Description
1 52 098 03 Starter assembly Includes 4-101
2 X-20-1-S Washer, lock 1/4"2
3 X-81-1-S Nut, hex. 1/4-202
4 52 755 05 Kit, drive Includes 51
5 52 755 08 Kit, drive parts1
6 52 227 01 Cap, drive end1
7 52 170 02-S Armature1
8 52 211 01-S Bolt, thru 1/4-20x5-7/8"2
9 277612 Cap assembly, commutator end Includes 101
10 48 755 15 Kit, brush & spring Replaced by 52 755 151
25 450 03-S Tag, caution1
52 357 01-S Lubricant, starter1
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Electric Start - Pg. 33
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Exhaust
Ref # Part Number Qty Description
4 X-21-1-S Washer, lock 5/16"4
10 52 041 14-S Gasket, exhaust2
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Exhaust
M18-24521 Page 23 of 40
Flywheel
Ref # Part Number Qty Description
1 52 025 36-S Flywheel1
2 52 468 15-S Washer, flat 3/8" I.D., 1-3/8" O.D. x 1/4"1
4 25 086 24-S Screw, hex. mach. 3/8-24x1-1/4"1
5 X-286-17-S Key, square 7/8x3/16x3/16"1
6 25 157 01-S Fan1
7 25 112 04-S Spacer 1/8"4
8 25 086 21-S Screw, hex. wash. hd. 1/4-20x5/8"4
11 25 162 02-S Screen, grass 3-1/2" dia. hole1
20 X-159-2-S Screw, H.C. sems 3/8-16x1"4
22 237373 Adapter, front drive1
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Flywheel
M18-24521 Page 25 of 40
Fuel Pump (Threaded)
Ref # Part Number Qty Description
1 52 559 01-S Pump, fuel assembly (w/threaded fittings) Includes 2-71
2 25 041 09-S Gasket, fuel pump1
3 X-25-63-S Washer, plain 1/4"2
5 25 155 02-S Connector, 90 degree hose For 1/4" I.D. rubber hose1
7 X-380-1-S Connector, straight For 3/8" I.D. rubber hose1
8 X-426-9-S Clamp, hose 1/2"2
9 52 353 04-S Line, fuel 6-3/4"1
10 47 086 08-S Screw, pozidriv T.H. 1/4-20x5/8"2
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Fuel Pump (Threaded)
M18-24521 Page 27 of 40
Gasket Set
Ref # Part Number Qty Description
52 755 94-S GASKET SET1
X-583-5-S Oil Seal1
271030-S Gasket, carburetor1
25 041 06-S Gasket, air cleaner elbow1
25 041 05 Gasket, fuel pump1
52 032 04-S Seal, breather1
52 032 13-S Seal, valve stem2
52 032 08-S Seal, oil rear - 1-1/2" O.D.1
52 032 10-S Seal, oil2
52 041 15-S Gasket, closure plate1
52 041 09-S Gasket, intake2
52 041 10 Gasket, exhaust2
52 041 16-S Gasket, oil filter cover1
52 041 20-S Gasket, cylinder head2
M18-24521 Page 28 of 40
Gasket Set
52 055 01-S Gasket, valve cover2
52 055 04-S Gasket, air cleaner2
277093-S Gasket, air cleaner1
52 041 14-S Gasket, exhaust2
25 041 09-S Gasket, fuel pump1
M18-24521 Page 29 of 40
Governor
Ref # Part Number Qty Description
3 52 186 06-S Arm, governor1
4 25 158 09 Bushing, linkage Replaced by 25 158 11-S2
5 X-81-1-S Nut, hex. 1/4-201
6 X-25-72-S Washer, plain 1/4"1
7 52 211 04-S Bolt, R.H. sq. neck 1/4-20x1"1
8 52 091 04-S Spring, governor1
12 X-67-97-S Screw, hex. wash. hd. 10-24x3/8"3
13 235778-S Clamp, cable2
17 234614-S Stop, governor1
20 52 119 01-S Lever, speed control1
21 52 531 02-S Stop, high speed1
22 231355-S Pin, governor stop1
23 X-25-12-S Washer, plain 1/4"1
24 52 078 04-S Shaft, governor1
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Governor
26 X-25-63-S Washer, plain 1/4"1
27 X-269-28-S Retainer, governor1
28 A-235743-S Kit, governor gear Includes 291
29 237022-S Washer, thrust1
31 82 755 07-S Kit, governor linkage Includes 41
39 X-67-83-S Screw, hex. wash. hd. 1/4-20x7/16"1
41 52 126 16-S Bracket, extension1
44 X-25-102-S Washer, plain 1/4"2
45 X-67-62-S Screw, hex. wash. hd. 1/4-20x3/4"1
M18-24521 Page 31 of 40
Ignition
Ref # Part Number Qty Description
1 237878-S Kit, stator (15 amp) Includes 4 and terminal 25 452 01-S1
2 X-67-51-S Screw, hex. wash. hd. 10-24x3/4"4
6 52 313 02-S Grommet1
7 25 755 03-S Kit, rectifier-regulator, 15 amp Includes 171
8 25 086 15-S Screw, hex. wash. hd. 1/4-20x1"2
9 52 584 02-S Module1
10 25 086 16-S Screw, hex. wash. hd. 1/4-20x1"2
11 52 126 08-S Bracket, module1
12 52 132 02-S Spark plug (RV17YC)2
15 236602-S Connector, female (3 contact)1
17 X-132-5-S Screw, H.C. sems 1/4-20x5/8"2
25 518 05-S Lead, black, rectifier-regulator (5" - 14 gauge - uninsulated
1
M18-24521 Page 32 of 40
push on tab terminals) (Not Illustrated)
Ignition
52 518 17-S Lead, white, module to connector (12-1/2" - 14 gauge -
1
insulated push on tab - uninsulated push on tab) (Not
Illustrated)
25 452 01-S Terminal (Not Illustrated)1
M18-24521 Page 33 of 40
Low Oil Pressure Switch
Ref # Part Number Qty Description
1 52 099 06 Switch, oil pressure1
52 518 13-S Lead, green, pressure switch (21" - 18 gauge - insulated
25 113 05-S Decal, oil sentry (Not Illustrated)1
1
push on tab and uninsulated push on tab terminals) (Not
Illustrated)
M18-24521 Page 34 of 40
Low Oil Pressure Switch
M18-24521 Page 35 of 40
Oil Filter
Ref # Part Number Qty Description
1 52 041 16-S Gasket1
2 52 181 03 Adapter1
3 X-55-15-S Screw, hex. socket hd. cap 5/16-18x1-1/4"4
4 52 050 02-S1 Oil filter1
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Oil Filter
M18-24521 Page 37 of 40
Oil Pump
Ref # Part Number Qty Description
1 52 393 09-S Rotor Set1
2 52 144 05-S Shaft, oil pump1
3 52 043 05-S Gear, oil pump1
4 52 422 01-S Spacer A Maximum of two (2) will be needed.A.R.
5 X-280-25-S Pin, roll1
6 52 096 03-S Cover, oil pump1
7 X-67-64-S Screw, hex. wash. hd. 10-32x7/16"4
M18-24521 Page 38 of 40
Oil Pump
M18-24521 Page 39 of 40
Piston & Rod
Ref # Part Number Qty Description
1 52 067 67-S Connecting Rod (Std.)2
1 52 067 68-S Connecting Rod (.010)2
2 52 874 11-S Piston w/Ring Set (Std.)1
2 52 874 12-S Piston w/Ring Set (.003)1
2 52 874 13-S Piston w/Ring Set (.010)1
2 52 874 14-S Piston w/Ring Set (.020)1
2 52 874 15-S Piston w/Ring Set (.030)1
3 230004-S Retainer, piston pin4
4 52 108 09-S Ring Set (Std. & .003)2
4 52 108 10-S Ring Set (.010)2
4 52 108 11-S Ring Set (.020)2
4 52 108 12-S Ring Set (.030)2
M18-24521 Page 40 of 40
Piston & Rod
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