1975 Diagrams
1975 · Engine Parts List
Big Clutch Engine
MC/GS 250 · MC/GS 400 · MC/GS 450 · 184 parts
MC 250MC 400MC 450GS 250GS 400GS 450
| Item No. | Part No. | Description | MC 250 | MC 400 | MC 450 | GS 250 | GS 400 | GS 450 |
|---|---|---|---|---|---|---|---|---|
| 1 | 701 | Crankcase LH | 1 | 1 | - | 1 | 1 | - |
| 2 | 402 | Crankcase Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 3 | 703 | Crankcase RH | 1 | 1 | - | - | - | - |
| 4 | 398 | Crankcase Cover RH | 1 | 1 | 1 | - | - | - |
| 5 | 2969 | Crankcase Gasket RH | 1 | 1 | 1 | - | - | - |
| 6 | 2493 | Crankcase Cover LH (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 7 | 707 | Crankcase Gasket LH | 1 | 1 | 1 | 1 | 1 | 1 |
| 8 | 1537 | Cylinder Head Screw M6x28 | 3 | 3 | 3 | 3 | 3 | 3 |
| 9 | 405 | Hexagon Nut M6x0.75 | 1 | 1 | 1 | 1 | 1 | 1 |
| 10 | 404 | Vent Tube | 1 | 1 | 1 | 1 | 1 | 1 |
| 11 | 1888 | Stud 5x14 Din 7 | 1 | 1 | 1 | 1 | 1 | 1 |
| 12 | 514 | Needle Bearing | 1 | 1 | 1 | 1 | 1 | 1 |
| 13 | 1714 | Washer B8 Din 137 | 4 | 4 | 4 | 4 | 4 | 4 |
| 14 | 1787 | Stud M8x28 Din 940 | 4 | 4 | 4 | 4 | 4 | 4 |
| 15 | 1670 | Hexagon Nut M8 Din 934 | 4 | 4 | 4 | 4 | 4 | 4 |
| 16 | 1831 | Tension Bush 8x10 7346 | 2 | 2 | 2 | 2 | 2 | 2 |
| 17 | 513 | Needle Bearing HK1612 | 1 | 1 | 1 | 1 | 1 | 1 |
| 18 | 392 | Stud | 1 | 1 | 1 | 1 | 1 | 1 |
| 19 | 572 | O Ring Seal | 1 | 1 | 1 | 1 | 1 | 1 |
| 20 | 587 | Spring Ring | 1 | 1 | 1 | 1 | 1 | 1 |
| 21 | 408 | Oil Fill Plug | 1 | 1 | 1 | 1 | 1 | 1 |
| 22 | 409 | Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 23 | 1552 | Cylinder Head Screw | 1 | 1 | 1 | 1 | 1 | 1 |
| 24 | 430 | Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 25 | 400 | Oil Drain Plug | 1 | 1 | 1 | 1 | 1 | 1 |
| 26 | 410 | Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 27 | 1538 | Cylinder Head Screw | - | 4 | 4 | - | 4 | 4 |
| 27 | 1537 | Cylinder Head Screw 6x28 (SC) ** | 1 | - | - | 1 | - | - |
| 28 | 1547 | Cylinder Head Screw | - | 3 | 3 | - | 3 | 3 |
| 28 | 1546 | Cylinder Head Screw 6x85 (SC) ** | 2 | - | - | 2 | - | - |
| 29 | 1539 | Cylinder Head Screw | - | 7 | 7 | - | 7 | 7 |
| 29 | 1538 | Cylinder Head Screw 6x28 (SC) ** | 4 | - | - | 4 | - | - |
| 30 | 1533 | Cylinder Head Screw | - | 1 | 1 | - | 1 | 1 |
| 31 | 715 | Cylinder | 1 | - | - | - | - | - |
| 31 | 2500 | 250 Cylinder | 1 | - | - | 1 | - | - |
| 31 | 2591 | 450 Cylinder | - | - | 1 | - | - | 1 |
| 32 | 721 | Base Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 33 | 65 | Cylinder Head Gasket | 1 | - | - | 1 | - | - |
| 34 | 467 | Exhaust Manifold | 1 | 1 | 1 | 1 | 1 | 1 |
| 35 | 298 | Manifold Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 36 | 1635 | Socket Screw M6x25 | 4 | 4 | 4 | 4 | 4 | 4 |
| 37 | 1704 | Spring Washer | 4 | 4 | 4 | 4 | 4 | 4 |
| 38 | 517 | Decompression Valve | - | 1 | 1 | - | 1 | 1 |
| 39 | 410 | Gasket | 1 | 1 | 1 | 1 | 1 | 1 |
| 40 | 682 | Inlet Manifold | 1 | 1 | 1 | 1 | 1 | 1 |
| 42 | 2502 | Cylinder Head | 1 | - | - | 1 | - | - |
| 43 | 2967 | Cylinder Stud | 5 | - | - | 5 | - | - |
| 44 | 1705 | Spring Washer M8 | 4 | 4 | 4 | 4 | 4 | 4 |
| 45 | 78 | Hexagon Nut M8 | 5 | 5 | 5 | 5 | 5 | 5 |
| 46 | 603 | Spark Plug | 2 | 2 | 2 | 2 | 2 | 2 |
| 47 | 2494 | Crankshaft CPL | 1 | - | - | - | - | - |
| 48 | 293 | Connecting Rod CPL | 1 | - | - | 1 | - | - |
| 49 | 522 | Piston Std 66.95 | 1 | - | - | 1 | - | - |
| 50 | 2101 | Piston Ring 76.95 | - | 1 | - | - | 1 | - |
| 51 | 523 | Piston Ring 66.95 | 1 | - | - | 1 | - | - |
| 51 | 534 | Piston Ring 76.95 | - | 1 | - | - | 1 | - |
| 52 | 424 | Needle Bearing | 1 | 1 | 1 | 1 | 1 | 1 |
| 53 | 535 | Piston Pin | 1 | - | - | 1 | - | - |
| 54 | 536 | Circlip | 2 | 2 | 2 | 2 | 2 | 2 |
| 55 | 693 | Bearing 3305 C3 | 1 | 1 | 1 | 1 | 1 | 1 |
| 56 | 547 | Seal | 1 | 1 | 1 | 1 | 1 | 1 |
| 57 | 713 | Distance Ring | 1 | 1 | 1 | 1 | 1 | 1 |
| 58 | 2497 | * Duplex Sprocket | 1 | - | - | 1 | - | - |
| 59 | 432 | * Lock Tap | — | — | — | — | — | — |
| 60 | 1684 | Nut | 1 | - | - | 1 | - | - |
| 61 | 425 | Ball Bearing | 1 | 1 | 1 | 1 | 1 | 1 |
| 62 | 548 | Crank Seal 25x35x8 | 1 | 1 | 1 | 1 | 1 | 1 |
| 63 | 2509 | Kickstarter Shaft | 1 | 1 | 1 | 1 | 1 | 1 |
| 64 | 666 | Kickstarter Return Spring | 1 | 1 | 1 | 1 | 1 | 1 |
| 65 | 659 | O Ring 18x15x1.5 | 2 | 2 | 2 | 2 | 2 | 2 |
| 66 | 5034 | Kickstarter Lower | 1 | 1 | 1 | 1 | 1 | 1 |
| 67 | 5033 | Kickstarter Lever | 1 | 1 | 1 | 1 | 1 | 1 |
| 68 | 655 | Spring | 1 | 1 | 1 | 1 | 1 | 1 |
| 69 | 1874 | Ball 70 | 1 | 1 | 1 | 1 | 1 | 1 |
| 70 | 1857 | Pin 3x25 Din 94 | 1 | 1 | 1 | 1 | 1 | 1 |
| 71 | 1840 | Circlip | 1 | 1 | 1 | 1 | 1 | 1 |
| 72 | 1570 | Hexagon Screw M6x25 | 1 | 1 | 1 | 1 | 1 | 1 |
| 73 | 1712 | Spring Washer | 1 | 1 | 1 | 1 | 1 | 1 |
| 74 | 656 | Rubber Pad | 1 | 1 | 1 | 1 | 1 | 1 |
| 75 | 434 | Clutch Housing Duplex (SSC) ** | 1 | - | - | 1 | - | - |
| 75 | 2944 | Clutch Housing (SC) ** Triplex | - | 1 | 1 | - | 1 | 1 |
| 75 | 726 | Clutch Housing (BC) ** Triplex | - | 1 | 1 | - | 1 | 1 |
| 76 | 729 | Kickstarter Ratchet (BC) ** (SC) ** | - | 1 | 1 | - | 1 | 1 |
| 77 | 1906 | Rivets (BC) ** (SC) ** | 8 | 8 | 8 | 8 | 8 | 8 |
| 78 | 730 | Kickstarter Pinion (BC) ** (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 79 | 731 | Spring (BC) ** (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 80 | 732 | Sprint Cup (BC) ** (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 81 | 733 | Spring Ring (BC) ** (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 76 | 438 | Kickstarter Ratchet (SSC) ** | 1 | - | - | 1 | - | - |
| 77 | 1905 | Rivets (SSC) ** | 8 | - | - | 8 | - | - |
| 78 | 439 | Kickstarter Pinion (SSC) ** | 1 | - | - | 1 | - | - |
| 79 | 440 | Spring (SSC) ** | 1 | - | - | 1 | - | - |
| 80 | 441 | Spring Cup (SSC) ** | 1 | - | - | 1 | - | - |
| 81 | 442 | Spring Ring (SSC) ** | 1 | - | - | 1 | - | - |
| 82 | 444 | Washer | 1 | 1 | 1 | 1 | 1 | 1 |
| 83 | 736 | Needle Bearing | 2 | 2 | 2 | 2 | 2 | 2 |
| 83 | 445 | Bush (SSC) **-(SC) ** | 1 | - | - | 1 | - | - |
| 84 | 679 | Washer (SC) ** | - | 1 | 1 | - | 1 | 1 |
| 84 | 2580 | Clutch Body (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 85 | 447 | Lock Tap (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 85 | 737 | Clutch Body (BC) ** | - | 1 | 1 | - | 1 | 1 |
| 86 | 1722 | Star Washer (BC) ** | - | 1 | 1 | - | 1 | 1 |
| 86 | 448 | Clutch Nut (SC) ** | 1 | 1 | 1 | - | 1 | 1 |
| 87 | 695 | Clutch Nut (BC) ** | - | 1 | 1 | - | 1 | 1 |
| 87 | 449 | Clutch Springs (SC) ** | 20 | 20 | 20 | 20 | 20 | 20 |
| 88 | 449 | Clutch Springs (BC) ** | 20 | 20 | 20 | 20 | 20 | 20 |
| 88 | 2575 | Clutch Guide (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 89 | 725 | Push Pin | 1 | 1 | 1 | 1 | 1 | 1 |
| 90 | 1869 | Ball 1/8 Din 5401 | 14 | 14 | 14 | 14 | 14 | 14 |
| 91 | 724 | Clutch Guide (BC) ** | - | 1 | 1 | - | 1 | 1 |
| 92 | 455 | Nut | 1 | 1 | 1 | 1 | 1 | 1 |
| 93 | 673 | Clutch Plate (BC) ** | - | 6 | 6 | - | 6 | 6 |
| 93 | 458 | Clutch Plate (SC) ** | - | 6 | 6 | - | 6 | 6 |
| 94 | 676 | Clutch Plate (BC) ** | 6 | - | - | 6 | 6 | 6 |
| 94 | 459 | Clutch Plate (SC) ** | 6 | 6 | 6 | 6 | 6 | 6 |
| 95 | 457 | Clutch Plate (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 95 | 677 | Pressure Plate (BC) ** | - | 1 | 1 | - | 1 | 1 |
| 96 | 461 | Lock Ring | 2 | 2 | 2 | 2 | 2 | 2 |
| 97 | 462 | Clutch Spindle | 1 | 1 | 1 | 1 | 1 | 1 |
| 97.1 | 460 | Pressure Place (SC) ** | 1 | 1 | 1 | 1 | 1 | 1 |
| 98 | 464 | O Ring | 1 | 1 | 1 | 1 | 1 | 1 |
| 99 | 465 | Clutch Lever | 1 | 1 | 1 | 1 | 1 | 1 |
| 100 | 1751 | Washer M6 | 1 | 1 | 1 | 1 | 1 | 1 |
| 101 | 1667 | Hexagon | 1 | — | — | — | — | — |
| 102 | 735 | Triplex Chain 3/8x7/32 | - | 1 | 1 | - | 1 | 1 |
| 102 | 443 | Duplex Chain | 1 | - | - | 1 | - | - |
| 103 | 509 | Bearing 6004 | 1 | 1 | 1 | 1 | 1 | 1 |
| 104 | 1851 | Circlip | 1 | 1 | 1 | 1 | 1 | 1 |
| 105 | 499 | Bearing 6005 | 1 | 1 | 1 | 1 | 1 | 1 |
| 106 | 1852 | Circlip 47x1.75 | 1 | 1 | 1 | 1 | 1 | 1 |
| 107 | 501 | Seal B30x40x7 | 1 | 1 | 1 | 1 | 1 | 1 |
| 108 | 502 | Spacer | 1 | 1 | 1 | 1 | 1 | 1 |
| 109 | 742 | Sleeve Pinion | 1 | 1 | 1 | 1 | 1 | 1 |
| 110 | 495 | Sleeve Pinion Plug | 1 | 1 | 1 | 1 | 1 | 1 |
| 111 | 503 | Sprocket 12T | 1 | - | - | 1 | - | - |
| 112 | 504 | Lock Tap | 1 | 1 | 1 | 1 | 1 | 1 |
| 113 | 505 | Nut | 1 | 1 | 1 | 1 | 1 | 1 |
| 114 | 892 | Needle Bearing | 2 | 2 | 2 | 2 | 2 | 2 |
| 115 | 750 | Needle Bearing | - | 1 | 1 | 1 | 1 | 1 |
| 116 | 749 | Spacer Bush | 1 | 1 | 1 | 1 | 1 | 1 |
| 117 | 739 | Main Shaft U | 1 | 1 | 1 | - | - | - |
| 118 | 740 | 2nd Gear M/S | 1 | 1 | 1 | - | - | - |
| 119 | 492 | Circlip | 2 | 2 | 2 | 2 | 2 | 2 |
| 120 | 746 | 3rd Gear M/S | 1 | 1 | 1 | 1 | 1 | 1 |
| 121 | 741 | Layshaft U1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 122 | 743 | 3rd Gear L/S U1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 123 | 762 | 2nd Gear L/S U1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 124 | 747 | 1st Gear L./S U | 1 | 1 | 1 | - | - | - |
| 125 | 512 | Washer | 1 | 1 | 1 | 1 | 1 | 1 |
| 126 | 511 | Plug | 1 | 1 | 1 | 1 | 1 | 1 |
| 127 | 551 | Shifting Cam | 1 | 1 | 1 | 1 | 1 | 1 |
| 128 | 574 | Washer | 1 | 1 | 1 | 1 | 1 | 1 |
| 129 | 581 | Tension Lever | 1 | 1 | 1 | 1 | 1 | 1 |
| 130 | 582 | Compression Spring | 1 | 1 | 1 | 1 | 1 | 1 |
| 131 | 1839 | Circlip | 1 | 1 | 1 | 1 | 1 | 1 |
| 132 | 576 | Spring | 1 | 1 | 1 | 1 | 1 | 1 |
| 133 | 575 | Hooked Ratchet | 1 | 1 | 1 | 1 | 1 | 1 |
| 134 | 753 | Pull Rod | 1 | 1 | 1 | 1 | 1 | 1 |
| 135 | 577 | Cover Plate | 1 | 1 | 1 | 1 | 1 | 1 |
| 136 | 579 | Lock Tap | 1 | 1 | 1 | 1 | 1 | 1 |
| 137 | 1564 | Hexagon Screw M6x10 | 1 | 1 | 1 | 1 | 1 | 1 |
| 138 | 751 | Shifting Crank (BC) ** | - | 1 | 1 | - | 1 | 1 |
| 139 | 573 | Return Spring | 1 | 1 | 1 | 1 | 1 | 1 |
| 140 | 553 | Shift Lever (BC) ** | - | 1 | 1 | 1 | 1 | 1 |
| 141 | 556 | Rubber Pad | 1 | 1 | 1 | 1 | 1 | 1 |
| 142 | 1570 | Hexagon Screw M6x25 | 1 | 1 | 1 | 1 | 1 | 1 |
| 143 | 1712 | Spring Washer | 1 | 1 | 1 | 1 | 1 | 1 |
| 144 | 585 | Shift Fork Spindle | 1 | 1 | 1 | 1 | 1 | 1 |
| 145 | 586 | Shift Fork | 3 | 3 | 3 | 3 | 3 | 3 |
| 146 | 611 | Rotor | 1 | 1 | 1 | - | - | - |
| 147 | 1702 | Spring Washer B4 | 1 | 1 | 1 | - | - | - |
| 148 | 1527 | Cylinder Head Screw M4x10 | 1 | 1 | 1 | - | - | - |
| 149 | 592 | Hexagon Screw | 1 | 1 | 1 | - | - | - |
| 150 | 1712 | Spring Washer | 1 | 1 | 1 | - | - | - |
| 151 | 260 | Coil | 1 | 1 | 1 | - | - | - |
| 152 | 596 | Condenser | 1 | 1 | 1 | - | - | - |
| 153 | 609 | Points | 1 | 1 | 1 | - | - | - |
| 154 | 1527 | Cylinder Head Screw M4 | 3 | 3 | 3 | - | - | - |
| 155 | 1702 | Washer | 3 | 3 | 3 | - | - | - |
| 156 | 1730 | Washer | 3 | 3 | 3 | - | - | - |
| 157 | 262 | Felt Pad | 1 | 1 | 1 | - | - | - |
| 158 | 681 | Flange | 1 | 1 | 1 | - | - | - |
| 160 | 683 | Clamp | 1 | 1 | 1 | - | - | - |
| 161 | 343 | Rubber Boot | 1 | 1 | 1 | - | - | - |
NOTES:
* Use 1883 Woodruff Key to hold the crankshaft Sprocket
** (BC) Big Clutch
** (SC) Small Clutch
** (SSC) Square Barrel Small Clutch
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