| YEAR | TYPE | ENGINE ID | ENGINE CASES | VIN | CARBURETOR | COIL | ROTOR FLY WHEEL | FORK INFO | CDI | HEAD | STATOR | STATOR COVER | SHOCK ARM LINKAGE | CARB BOOT AND REED BOLT PATTERN | CLUTCH COVER | INNER CLUTCH COVER | CLUTCH BASKET | REAR HUB | FRONT HUB | FRONT AXLE | SHIFT FORKS | SHIFT SHAFT | CYLINDER | petcock details | REAR BRAKE ROTOR | FRONT BRAKE ROTOR | REAR BRAKE BACKING PLATE | FRONT BRAKE BACKING PLATE | FRONT ENGINE MOUNTS | TRANSMISSION | SEAT | SHOCK | AIR BOX | AIR BOX TO CARBURETOR BOOT |
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| 1976 | YZ400 | | | | | | | | | | | | | | | | | | | | | | FITS 76-78 YZ400 | | | | | | | | | | | |
| 1977 | YZ400 | | FITS 77-78 YZ400 | | | | F37351 | 38MM CHROME OD | F8T00 | | | | | | | | | | | | | | FITS 76-78 YZ400 | | | | | | | | | | | |
| 1978 | YZ400 | | FITS 77-78 YZ400 | | | | | | F8T00 | | | | | | | | | | | | | | FITS 76-78 YZ400 | | | | | | | | | | | |
| 1979 | YZ400 | | | | | | | | | | | | | | | | | | | | | | 82MM STANDARD BORE | 2X500 ART 1/2 81025 | | | | | | | | | | |
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| 1980 | YZ465 | | | | | | | 38MM CHROME OD | | | | | | | | | Fits 80-82 YZ250, 80-81 YZ465, 81-82 IT250, 81-82 IT465 | | | | | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | | | | | | | | |
| 1981 | YZ465 | | | | | | | 43MM CHROME OD | | | | | | | | | Fits 80-82 YZ250, 80-81 YZ465, 81-82 IT250, 81-82 IT465 | 20MM AXLE - BRG TO BRG 132MM - DRUM ID 150MM - FITS 81-83 IT250, 81-82 IT465, 83-84 IT490, 81 YZ250, 81 YZ465, 82 YZ490 | | | | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | FITS 81 YZ250 AND YZ 465 | | | | | | | |
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| 1982 | YZ490 | | | | | | | 43MM CHROME OD | | | | | | | | | | 20MM AXLE - BRG TO BRG 132MM - DRUM ID 150MM - FITS 81-83 IT250, 81-82 IT465, 83-84 IT490, 81 YZ250, 81 YZ465, 82 YZ490 | | | | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | | FITS 82-84 YZ250 & 490, 83 IT250, 83-84 IT490, 83-84 TT600 | | | | | | |
| 1983 | YZ490 | | | | FITS 83 YZ490 ONLY | F6T411 | F8T206 FITS 83-90 YZ490, 92-83 WR500 | 43MM CHROME OD | 23X-20 | FITS 1983 YZ490 ONLY | | | | | | | | | 23X00 15MM AXLE DIA - BRG TO BRG 94MM - FITS 82-84 YZ250 & 125, 82 IT465, 82 TT250, 82 IT175, 83-84 TT600, 83 YZ490 | | | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | FITS 83-87 YZ250, 87 YZ125, 83 YZ490 | FITS 82-84 YZ250 & 490, 83 IT250, 83-84 IT490, 83-84 TT600 | | | | | | |
| 1984 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | 43MM CHROME OD | | | | | | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | | | | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | FITS 84-90 YZ490 | FITS 82-84 YZ250 & 490, 83 IT250, 83-84 IT490, 83-84 TT600 | FITS 84-90 YZ490 & 92-93 WR500 | | 23X 82.5 Fits 83-85 YZ250 & 84-85 YZ490 | | | |
| 1985 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | 43MM CHROME OD | | | | | | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | | | | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | 240MM OD - ID 117.5MM - BOLTS 4 ON BC ON 130MM - FITS 85 YZ125, 250, 490 | FITS 84-90 YZ490 | | FITS 84-90 YZ490 & 92-93 WR500 | | 23X 82.5 Fits 83-85 YZ250 & 84-85 YZ490 | | | |
| 1986 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | 43MM CHROME OD | | | | | FITS 86-90 YZ490, 86 YZ125, 87 YZ250 | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | | FITS 86-91 YZ125 YZ250, 86-90 YZ490, ANY MANY OTHERS | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | FITS 84-90 YZ490 | | FITS 84-90 YZ490 & 92-93 WR500 | FITS 86-90 YZ490 & 92-93 WR500 | | FITS 77-87 YZ250, 79-83 IT250, 85-86 TY350, 86 YZ490 146.88mm | | |
| 1987 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | 43MM CHROME OD | | | | | FITS 86-90 YZ490, 86 YZ125, 87 YZ250 | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | 2HH00 15MM AXLE DIA - BRG TO BRG 86.7MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 87-89 YZ125, YZ250 & 87-90 YZ490 | FITS 86-91 YZ125 YZ250, 86-90 YZ490, ANY MANY OTHERS | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | FITS 84-90 YZ490 | | FITS 84-90 YZ490 & 92-93 WR500 | FITS 86-90 YZ490 & 92-93 WR500 | | Spring thickness: 11.3MM OD - Spring Diameter: 84MM - Spring length as mounted: 254MM - Upper mount tab thickness: 27.1MM - Upper mount tab hole ID: 12MM - Lower mount Width: 25.1MM - Lower mount hole ID: 12MM - Eye to Eye: 425MM FITS 87 YZ490 & YZ250 | FITS 87-88 YZ125, 86-87 YZ250, 87-90 YZ490 | |
| 1988 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | | | | | | FITS 86-90 YZ490, 86 YZ125, 87 YZ250 | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | 2HH00 15MM AXLE DIA - BRG TO BRG 86.7MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 87-89 YZ125, YZ250 & 87-90 YZ490 | FITS 86-91 YZ125 YZ250, 86-90 YZ490, ANY MANY OTHERS | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | OD 230MM - ID 86MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 85-86 TT600, TT350 - 86 IT200 - 88 YZ125, YZ250 - 88-90 YZ490 | FITS 84-90 YZ490 | | FITS 84-90 YZ490 & 92-93 WR500 | FITS 86-90 YZ490 & 92-93 WR500 | | FITS 88-90 YZ490 | FITS 87-88 YZ125, 86-87 YZ250, 87-90 YZ490 | |
| 1989 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | | | | | | FITS 86-90 YZ490, 86 YZ125, 87 YZ250 | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | 2HH00 15MM AXLE DIA - BRG TO BRG 86.7MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 87-89 YZ125, YZ250 & 87-90 YZ490 | FITS 86-91 YZ125 YZ250, 86-90 YZ490, ANY MANY OTHERS | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | OD 230MM - ID 86MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 85-86 TT600, TT350 - 86 IT200 - 88 YZ125, YZ250 - 88-90 YZ490 | FITS 84-90 YZ490 | | FITS 84-90 YZ490 & 92-93 WR500 | FITS 86-90 YZ490 & 92-93 WR500 | | FITS 88-90 YZ490 | FITS 87-88 YZ125, 86-87 YZ250, 87-90 YZ490 | |
| 1990 | YZ490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | | | | | | FITS 86-90 YZ490, 86 YZ125, 87 YZ250 | | | | 23X1 FITS 83-86 YZ250, 83-84 IT490, 84-90 YZ490, 92-93 WR500 | | 2HH00 15MM AXLE DIA - BRG TO BRG 86.7MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 87-89 YZ125, YZ250 & 87-90 YZ490 | FITS 86-91 YZ125 YZ250, 86-90 YZ490, ANY MANY OTHERS | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | OD 230MM - ID 86MM - 6 BOLTS UNEQUAL SPACING ON A 102MM BOLT CIRCLE - FITS 85-86 TT600, TT350 - 86 IT200 - 88 YZ125, YZ250 - 88-90 YZ490 | FITS 84-90 YZ490 | | FITS 84-90 YZ490 & 92-93 WR500 | FITS 86-90 YZ490 & 92-93 WR500 | | FITS 88-90 YZ490 | FITS 87-88 YZ125, 86-87 YZ250, 87-90 YZ490 | |
| | | | | | | | | | | | | | | | | | | | | FITS 86-91 YZ125 YZ250, 86-90 YZ490, ANY MANY OTHERS | | | | | | | | | | | | | | |
| 1992 | WR500 | | | | | | | | | | | | | | | | | | | | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | | | | FITS 86-90 YZ490 & 92-93 WR500 | | | | |
| 1993 | WR500 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | | | | | | | | | | | | | | FITS 86-90 YZ490, 92-93 WR500 | FITS 80-87 YZ250, 80-81 YZ465, 81-83 IT250, 81-82 IT465, 82-90 YZ490, 83-84 IT490, 92-93 WR500 | | | | | | | | FITS 86-90 YZ490 & 92-93 WR500 | | | | |
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| 1983 | IT490 | | | | | | F8T206 FITS 83-90 YZ490, 92-83 WR500 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| 1984 | IT490 | | | | MIKUNI 37.5MM ID 3R500 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |