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MUGEN ENGINE KITS

FOR HONDA CR's




Mugen ME125Rz Super Pro Kit

for the 1979 Honda CR125R


The Mugen ME125Rz Super Pro kit contains the following components:
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

The Mugen ME125W1 Water Cooled "Banzai Kit" contains the following components:

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


The Mugen ME125 Pro kit contains the following components:
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



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



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



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




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





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

The Mugen ME250 Pro kit contains the following components:
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

The Mugen/Showa Suspension components are as follows:

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

The Mugen/Showa Suspension components are as follows:

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

The Mugen/Showa Suspension components are as follows:

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

The Mugen/Showa Suspension components are as follows:

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

The Mugen/Showa Suspension components are as follows:

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

The Mugen ME360 Pro kit contains the following components:
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

The Mugen ME360 Pro kit contains the following components:
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

The Mugen ME460 Air Cooled Super Pro kit contains the following components:
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

The Mugen ME480 Air cooled Super Pro kit contains the following components:
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