MUGEN ENGINE KITS
FOR HONDA CR's
Mugen ME125Rz Super Pro Kit
for the 1979 Honda CR125R
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Cylinder, cylinder head, piston, rings, ring clips, expansion chamber and silencer,
(4) cylinder head studs, head gasket, base gasket, (2) reed valve gaskets,
(4) stud bolts, (5) clutch springs, (2) dowel pins.
| Parts No. | Description | Quantity |
| 12200-YA1-000 | Cylinder Head | 1 |
| 12100-YA1-000 | Cylinder | 1 |
| 18300-YA1-000 | Expansion chamber | 1 |
| 18330-YA1-000 | Silencer comp. | 1 |
| 22401-YA3-000 | Clutch spring | 5 |
| Standard parts set - (A) | Description | Quantity |
| 13100-444-000 | Piston complete | 1 |
| 13121-444-003 | Piston ring | 1 |
| 94601-14000 | Piston pin clip | 2 |
| Standard parts set - (B) | Description | Quantity |
| 12251-444-000 | Cylinder Head gasket | 1 |
| 12191-444-003 | Cylinder gasket | 1 |
| 14131-444-000 | Reed valve gasket A | 1 |
| 14132-444-000 | Reed valve gasket B | 1 |
| 90034-444-000 | Cylinder head stud | 4 |
| 92700-0806505 | Stud bolt 8 x 65 mm | 4 |
| 94301-08140 | Dowel pin 8 x 14 mm | 2 |
| Optional parts | Description | Quantity |
| 16100-444-811 | Carburetor assy 34 m/m | 1 |
| 16020-444-004 | Carburetor jetting op parts | 1 |
Mugen ME125W1 Water Cooled "Banzai Kit"
for the 1980 Honda CR125R
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| Engine Special Parts | Description | Quantity |
| 11340-YA1B-0100 | Cover L. Case Comp. | 1 |
| 19218-YA1B-0000 | Shaft W. Pump Drive | 1 |
| 19217-YA1B-0000 | Collar Spl 10 mm | 1 |
| 11531-YA1B-0000 | Oil Seal 10 x 31 x 13.5 | 1 |
| 12100-YA1B-0100 | Cylinder | 1 |
| 12200-YA1B-0000 | Cylinder Head | 1 |
| 12251-YA1B-0000 | Cylinder Head gasket | 1 |
| 12500-YA1B-0000 | Hose Joint B | 1 |
| 12501-YA1B-0000 | Hose Joint A | 1 |
| 19200-YA1B-0000 | Water Pump Assy | 1 |
| 90013-YA1B-0000 | Bolt Spl 10 x 25 mm | 1 |
| 19216-YA1B-0000 | Collar Pump Shaft | 1 |
| 19215-YA1B-0100 | Impeller W. Pump | 1 |
| 19220-YA1B-0100 | Cover W. Pump | 1 |
| 19225-YA1B-0100 | Gasket W. Pump | 1 |
| 90034-YA1B-0000 | Cylinder Stud bolt | 4 |
| 90050-YA1B-0000 | Cap Bolt 6 x 15 mm | 4 |
| 22401-YA3-0000 | Clutch spring | 5 |
| Frame Special Parts | Description | Quantity |
| 17253-YA1B-8000 | Tube A/C Connecting | 1 |
| 19100-YA1B-8000 | Radiator Assy | 1 |
| 19201-YA1B-8000 | M.T. Stay L. | 1 |
| 19202-YA1B-8000 | M.T. Stay R. | 1 |
| 19400-YA1B-8000 | Plate Radiator Guide | 1 |
| 19410-YA1B-8000 | Collar Tank Stay | 4 |
| 19501-YA1B-8000 | Water Hose Upper | 2 |
| 19502-YA1B-8000 | Water Hose Lower A | 2 |
| 19505-YA1B-8000 | Hose M.T. | 2 |
| 19506-YA1B-8000 | Hose M.T. Rubber | 2 |
| 19507-YA1B-8000 | Guide Brake Cable | 2 |
| 19510-YA1B-8000 | Band Water Hose | 10 |
| 19521-YA1B-8100 | Water Pipe In | 1 |
| 19522-YA1B-8100 | Water Pipe Out | 1 |
| 19525-YA1B-8000 | Rubber Radiator M.T. | 4 |
| 19503-YA1B-8000 | Water Hose Lower B | 1 |
| Standard Parts | Description | Quantity |
| 11394-444-0000 | Gasket L. Cover | 1 |
| 12191-444-0000 | Cylinder gasket | 1 |
| 13100-444-0000 | Piston complete | 1 |
| 13110-444-3050 | Piston pin set | 1 |
| 13121-444-0030 | Piston ring | 1 |
| 14131-444-0000 | Reed valve gasket A | 1 |
| 14132-444-0000 | Reed valve gasket B | 1 |
| 18291-466-0000 | Ex Pipe flange gasket | 1 |
| 90037-360-0000 | Oil Check Drain Cock | 1 |
| 90236-300-0000 | Nut Flange 8 mm | 4 |
| 90443-107-0000 | Nut Cap Flange 8 mm | 4 |
| 90501-040-0000 | Washer Seat Setting | 4 |
| 90543-273-0000 | Packing Fr Fork Drain | 1 |
| 91206-286-0130 | Oil Seal 14 x 28 x 7 | 1 |
| 91313-636-9600 | O-ring 18.5 x 2 | 2 |
| 92700-08050 | Cylinder stud bolt 8 x 50 | 2 |
| 92700-08054 | Cylinder stud bolt 8 x 54 | 2 |
| 93495-06016-00 | Bolt, Washer 6 x 16 | 4 |
| 94001-06000-0S | Hex Nut 6 mm | 1 |
| 94301-06100 | Dowel pin 6 x 10 mm | 2 |
| 94301-08120 | Dowel pin 8 x 12 mm | 2 |
| 96100-06000-00 | Brg Ball Radial 6000 | 2 |
| 94601-14000 | Clip Piston Pin 14 mm | 2 |
| 95700-06025-08 | Bolt, Flange 6 x 25 | 4 |
| 95700-06030-08 | Bolt, Flange 6 x 30 | 2 |
| 95700-06036-08 | Bolt, Flange 6 x 36 | 2 |
| 95700-06068-08 | Bolt, Flange 8 x 68 | 2 |
| 95003-1402410 | Tube, Vinyl 6 x 9 x 240 | 1 |
| 91404-579-000 | Clip Tail Light | 1 |
| Spare Parts | Description | Quantity |
| 12251-YA1B-0000 | Cylinder Head gasket | 1 |
| 19225-YA1B-0100 | Gasket W. Pump | 1 |
| 90013-YA1B-0000 | Bolt Spl 10 x 25 mm | 1 |
| 91313-636-9600 | O-ring 18.5 x 2 | 1 |
Mugen ME125 Pro Kit
for the 1984 Honda CR125R
Cylinder, cylinder head, one-ring piston, ring, ring clips, expansion chamber,
(4) cylinder head studs, head gasket, base gasket, (2) reed valve gaskets,
modified radiator hose coupling, new intake manifold, Mugen reed assembly,
(2) dowel pins.
Mugen ME125W Kit / Suspension
for the 1987 Honda CR125RH
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The Mugen ME125W kit contains the following components:
Cylinder, cylinder head, piston, rings, (2) pin clips, piston pin,
(6) cylinder head studs, head gasket, base gasket, exh. joint gasket,
cap nut, (2) dowel pins, connecting rod bearing.
water hoses, (2) water hose clamps.
| Special Parts No. | Description | Quantity |
| 12200-YA1-0087-B7 | Cylinder Head | 1 |
| 12100-YA1-0087 | Cylinder | 1 |
| 12251-YA1-0087 | Cylinder Head gasket | 1 |
| 13101-YA1-0087 | Piston | 1 |
| 13121-YA1-0085-B2 | Piston Ring | 1 |
| 19064-YA1-0085 | Water Hose D | 1 |
| Standard Parts set | Description | Quantity |
| 94601-14000 | Piston pin clip | 2 |
| 12191-KS6-700 | Cylinder gasket | 1 |
| 13111-KA3-760 | Piston pin | 1 |
| 18314-KS6-700 | Exh. Joint gasket | 1 |
| 19069-KA4-700 | Water Hose Joint | 1 |
| 19506-KS6-700 | Water Hose B Clamp | 2 |
| 90011-HA2-000 | Stud bolt 8 x 50 mm | 6 |
| 94301-10160 | Dowel pin 10 x 16 mm | 2 |
| 90443-107-000 | Cap Nut 8 mm | 1 |
| 91008-KA3-761 | Connecting Rod Bearing | 1 |
| Works Suspension Parts | Description | Quantity |
| 51411-YA1-0087 | Inner Fork Base Comp. | 1 |
| 52400-YA1-0087 | Rear Shock Assembly | 1 |
Mugen ME125W Kit / Suspension
for the 1988 Honda CR125RJ
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The Mugen ME125W kit contains the following components:
Cylinder, cylinder head, piston, rings, (2) pin clips, piston pin,
(6) cylinder head studs, head gasket, base gasket, exh. joint gasket,
cap nut, (2) dowel pins, connecting rod bearing.
water hoses, (2) water hose clamps.
| Parts No. | Description | Quantity |
| K0000-YA1-0088 | ME125W Power Up Kit | 1 |
| Special Parts No. | Description | Quantity |
| 12200-YA1-0087-B7 | Cylinder Head | 1 |
| 12100-YA1-0088 | Cylinder | 1 |
| 12251-YA1-0087 | Cylinder Head gasket | 1 |
| 13101-YA1-0088 | Piston | 1 |
| 13121-YA1-0085-B2 | Piston Ring | 1 |
| 19064-YA1-0085 | Water Hose D | 1 |
| Standard Parts set | Description | Quantity |
| 94601-15000 | Piston pin clip | 2 |
| 12191-KS6-701 | Cylinder gasket | 1 |
| 13111-KV3-000 | Piston pin | 1 |
| 18314-KS6-701 | Exh. Joint gasket | 1 |
| 19069-KA4-700 | Water Hose Joint | 1 |
| 19501-KS6-700 | Water Hose | 1 |
| 19506-KS6-700 | Water Hose B Clamp | 2 |
| 90011-HA2-000 | Stud bolt 8 x 50 mm | 6 |
| 94301-10160 | Dowel pin 10 x 16 mm | 2 |
| 90443-107-000 | Cap Nut 8 mm | 1 |
| 91101-KV3-003 | Connecting Rod Bearing | 1 |
| Works Suspension Parts | Description | Quantity |
| 51411-YA1-0088 | Inner Fork Base Comp. | 1 |
| 52400-YA1-0088 | Rear Shock Assembly | 1 |
Mugen ME125W Kit / Suspension
for the 1989 Honda CR125RK
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The Mugen ME125W kit contains the following components:
Cylinder, cylinder head, piston, rings, (2) pin clips, piston pin,
(6) cylinder head studs, (2) O-rings, base gasket, exh. joint gasket,
(6) cap nuts/washers, (2) dowel pins, connecting rod bearing.
water hoses, (2) water hose clamps, oil check bolt.
| Parts No. | Description | Quantity |
| K0000-YA1-0089 | ME125W Power Up Kit | 1 |
| Special Parts No. | Description | Quantity |
| 12100-YA1-0089-B2 | Cylinder Head | 1 |
| 12100-YA1-0089 | Cylinder | 1 |
| 12212-YA1-0089 | O-ring 98 x 2.4 | 1 |
| 12213-YA1-0089 | O-ring 61 x 1.9 | 1 |
| 13101-YA1-0089-B2 | Piston | 1 |
| 13121-YA1-0085-B2 | Piston Ring | 1 |
| 19064-YA1-0089 | Water Hose D | 1 |
| Standard Parts set | Description | Quantity |
| 94601-15000 | Piston pin clip | 2 |
| 12191-KS6-701 | Cylinder gasket | 1 |
| 13111-KZ4-000 | Piston pin | 1 |
| 18314-KZ4-701 | Exh. Joint gasket | 1 |
| 19069-KA4-700 | Water Hose Joint | 1 |
| 19506-KS6-700 | Water Hose B Clamp | 2 |
| 92900-08032-0E | Stud bolt 8 x 32 mm | 6 |
| 94301-10160 | Dowel pin 10 x 16 mm | 2 |
| 90443-107-000 | Cap Nut 8 mm | 6 |
| 90441-422-000 | Washer 8 mm | 6 |
| 91101-KV3-702 | Connecting Rod Bearing | 1 |
| 90037-360-000 | Oil Check Bolt | 1 |
| 90543-273-000 | Fr Fork Drain Packing | 1 |
| Up Side Down Fork Parts | Description | Quantity |
| 53230-KZ3-000 | Fork Top Bridge | 1 |
| 53200-KZ3-000 | Strg Stem Comp | 1 |
| 91015-425-832 | head Pipe Upper Brg. | 1 |
| 53214-KA4-701 | Strg Head Dust Seal | 1 |
| 96300-08045-00 | Flange Bolt 8 x 45 | 8 |
| 45110-KZ3-026 | Bracket Comp. | 1 |
| 45133-MA3-006 | Boot (B) | 1 |
| 90155-KZ3-000 | Flange Bolt 8 x 50 | 1 |
| 90154-KZ3-000 | Flange Bolt 8 x 44 | 1 |
| 45131-166-016 | Pin Bolt | 1 |
| 90304-425-000 | Strg Stem Nut | 1 |
| 51611-YA1-0089 | Front Fork Boot | 2 |
| Works Suspension Parts | Description | Quantity |
| 51411-YA1-0089 | Front Fork Setting Kit | 1 |
| 52400-YA1-0089 | Rear Shock Assembly | 1 |
| 51400-YA1-0089 | Complete Up Side Down Fork Assembly | 1 |
Mugen ME125W Kit / Suspension
for the 1990 Honda CR125RL
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The Mugen ME Race kit and Mugen/Showa Suspension components are as follows:
| Part No. | Description | Quantity |
| K0000-YA1-0090 | Race Cylinder kit | 1 |
| 51411-YA1-0090 | Front Fork Damping Kit | 1 |
| 51400-YA1-0090 | Works Front Fork Assy. | 1 |
| 52400-YA1-0090 | Works Rear Shock Assy. | 1 |
Mugen ME125W Kit / Suspension
for the 1991 Honda CR125RM
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The Mugen ME Race kit and Mugen/Showa Suspension components are as follows:
| Part No. | Description | Quantity |
| K0000-YA1-0091 | Race Cylinder kit | 1 |
| 51411-YA1-0091 | Front Fork Damping Kit | 1 |
| 51401-YA1-0091 | Front Fork Springs | 1 |
| 52400-YA1-0091 | Works Rear Shock Assy. | 1 |
Mugen ME250 Pro Kit
for the 1980 Honda CR250R
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Cylinder, piston, piston pin, rings, ring clips, expansion chamber, (6) longer cylinder
studs, head gasket, base gasket, (2) reed valve gasket, exhaust flange gasket.
| Parts No. | Description | Quantity |
| 12100-YA2-000 | Cylinder | 1 |
| Standard Parts set | Description | Quantity |
| 13100-467-000 | Piston complete | 1 |
| 13121-430-305 | Piston ring set | 1 |
| 13110-467-305 | Piston pin set | 2 |
| 12191-467-000 | Cylinder gasket | 1 |
| 12254-430-000 | Cylinder head gasket | 1 |
| 14132-430-000 | Reed valve gasket A | 1 |
| 14133-430-000 | Reed valve gasket B | 1 |
| 18291-430-000 | Exhaust Flange gasket | 1 |
| 90032-430-000 | Cylinder Stud bolt | 6 |
| 94301-08140 | Dowel pin A, 8 x 14 mm | 2 |
| 18300-YA2-000 | Expansion chamber | 1 |
Mugen/Showa Suspension
for the 1987 CR250RH
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1987 HONDA CR250RH PARTS
| Part No. | Description | Quantity |
| 51411-YA2-0087 | Front Fork Damping Kit | 1 |
| 52400-YA2-0087 | Works Rear Shock Assy. | 1 |
Mugen/Showa Suspension
for the 1988 CR250RJ
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1988 HONDA CR250RJ PARTS
| Part No. | Description | Quantity |
| 51411-YA2-0088 | Front Fork Damping Kit | 1 |
| 52400-YA2-0088 | Works Rear Shock Assy. | 1 |
Mugen/Showa Suspension
for the 1989 CR250RK
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1989 HONDA CR250RK PARTS
| Part No. | Description | Quantity |
| 51411-YA2-0089 | Front Fork Damping Kit | 1 |
| 52400-YA2-0089 | Works Rear Shock Assy. | 1 |
Mugen/Showa Suspension
for the 1990 CR250RL
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1990 HONDA CR250RL PARTS
| Part No. | Description | Quantity |
| 51411-YA2-0090 | Front Fork Damping Kit | 1 |
| 52400-YA2-0090 | Works Rear Shock Assy. | 1 |
Mugen/Showa Suspension
for the 1991 CR250RM
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1991 HONDA CR250RM PARTS
| Part No. | Description | Quantity |
| 51411-YA2-0091 | Front Fork Damping Kit | 1 |
| 52400-YA2-0091 | Works Rear Shock Assy. | 1 |
Mugen ME360 Pro Kit
for the 1978-79 Honda CR250R
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Cylinder (side port), cylinder head, piston, rings, ring clips, expansion chamber,
(6) cylinder head stud bolts, head gasket, base gasket, (2) reed valve gaskets,
(6) clutch springs, (2) dowel pins, carburetor insulator.
| Parts No. | Description | Quantity |
| 12200-YA3-781 | Cylinder Head | 1 |
| 12254-YA3-781 | Cylinder head gasket | 1 |
| 12100-YA3-781 | Cylinder Comp. HCR | 1 |
| 16221-YA3-781 | Insulator Carburetor | 1 |
| 13011-YA3-781 | Piston ring | 2 |
| 13100-YA3-781 | Piston Comp. | 1 |
| 13110-YA3-781 | Piston pin set | 1 |
| ----- | Piston pin clip | 2 |
| ----- | Connecting Rod Bearing | 1 |
| 12191-YA3-781 | Cylinder gasket | 1 |
| 22401-YA3-781 | Clutch spring | 6 |
| 18300-YA3-781 | Expansion chamber | 1 |
| Standard Parts set | Description | Quantity |
| 94301-08140 | Dowel pin 8 x 14 mm | 2 |
| 90032-430-000 | Cylinder stud bolt | 6 |
| 14132-430-000 | Reed valve gasket A | 1 |
| 14133-430-000 | Reed valve gasket B | 1 |
Mugen ME360 Pro Kit
for the 1980 Honda CR250R
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Cylinder (center port), cylinder head, piston, rings, ring clips, expansion chamber,
(6) cylinder head stud bolts, head gasket, base gasket, (2) reed valve gaskets,
(6) clutch springs, (2) dowel pins, carburetor insulator.
| Parts No. | Description | Quantity |
| 12200-YA3-781 | Cylinder Head | 1 |
| 12254-YA3-781 | Cylinder Head gasket | 1 |
| 12100-YA3-010 | Cylinder Comp. HCR | 1 |
| 16221-YA3-781 | Insulator Carburetor | 1 |
| 13011-YA3-781 | Piston ring | 2 |
| 13100-YA3-781 | Piston Comp. | 1 |
| 13110-YA3-781 | Piston pin set | 1 |
| ----- | Piston pin clip | 2 |
| ----- | Connecting Rod Bearing | 1 |
| 12191-YA3-781 | Cylinder gasket | 1 |
| 22401-YA3-781 | Clutch spring | 6 |
| 18300-YA3-010 | Expansion chamber | 1 |
| 23421-YA3-781 | Gear Main Shaft 2nd | 1 |
| 23430-YA3-781 | Gear Counter Shaft 2nd | 1 |
| 23441-YA3-781 | Gear Main Shaft 3rd | 1 |
| 23451-YA3-781 | Gear Counter Shaft 3rd | 1 |
| Standard Parts set | Description | Quantity |
| 94301-08140 | Dowel pin 8 x 14 mm | 2 |
| 90032-430-000 | Cylinder stud bolt | 6 |
| 14132-430-000 | Reed valve gasket A | 1 |
| 14133-430-000 | Reed valve gasket B | 1 |
Mugen ME460 Super Pro Kit
for the 1981 Honda CR450RB
Cylinder, cylinder head, piston, piston pin, rings, ring clips, head gasket, base
gasket, (2) reed valve gaskets, exhaust flange gasket, (7) stud bolts,
(6) clutch springs, (2) dowel pins, (7) flange nuts, decals.
| Special Parts | Description | Quantity |
| 12100-YA3-0081 | Cylinder | 1 |
| 12200-YA3-0081 | Cylinder Head | 1 |
| 12251-YA3-0081 | Cylinder head gasket | 1 |
| 13101-YA3-0081 | Piston Comp. | 1 |
| 13121-YA3-0081 | Piston ring | 2 |
| 22401-YA3-0081 | Clutch spring | 6 |
| Standard Parts | Description | Quantity |
| 12191-KA5-0000 | Cylinder gasket | 1 |
| 13111-KA5-0000 | Piston pin | 1 |
| 14132-430-0000 | Reed valve gasket A | 1 |
| 14133-430-0000 | Reed valve gasket B | 1 |
| 18291-430-0000 | Exhaust Flange gasket | 1 |
| 90236-300-0000 | Flange nut 8 mm | 7 |
| 90601-KA5-0000 | Piston pin clip 20 mm | 2 |
| 91007-KA5-0030 | Connecting Rod Bearing | 1 |
| 90032-430-000 | Cylinder stud bolt 8 x 60 | 7 |
| 94301-12200 | Dowel pin A, 12 x 20 mm | 2 |
Mugen ME480 Super Pro Kit
for the 1982-83 Honda CR480R
Cylinder, cylinder head, piston, piston pin, rings, ring clips, head gasket, base
gasket, (2) reed valve gaskets, exhaust flange gasket, (7) stud bolts,
(2) dowel pins, (7) flange nuts, decals.
| Special Parts | Description | Quantity |
| 12100-YA4-0083 | Cylinder | 1 |
| 12200-YA4-0082 | Cylinder Head | 1 |
| 13121-YA4-0082 | Piston ring | 2 |
| Standard Parts | Description | Quantity |
| 12191-KA5-7700 | Cylinder gasket | 1 |
| 12254-KA5-7700 | Cylinder head gasket | 1 |
| 13101-KA5-7700 | Piston Comp. | 1 |
| 13111-KA5-7700 | Piston pin | 1 |
| 14132-430-0000 | Reed valve gasket A | 1 |
| 14133-430-0000 | Reed valve gasket B | 1 |
| 18291-430-0000 | Exhaust Flange gasket | 1 |
| 90236-300-0000 | Flange nut 8 mm | 7 |
| 90601-KA5-0000 | Piston pin clip 20 mm | 2 |
| 91008-KA5-0030 | Connecting Rod Bearing | 1 |
| 92700-08060-3E | Cylinder stud bolt 8 x 60 | 7 |
| 94301-12200 | Dowel pin A, 12 x 20 mm | 2 |
| Page last updated : October 14, 2009 |
