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techtalk:miscres:miscres51 [2022/03/14 05:52] hippysmack [How you can use casting numbers] |
techtalk:miscres:miscres51 [2022/03/14 06:15] (current) hippysmack [Circle Date Codes] |
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| ====== Circle Date Codes ====== | ====== Circle Date Codes ====== | ||
| + | Many parts have a circle date code cast into them. This refers to the date the part was made (not the year model is was made for). \\ | ||
| + | Generally the date code will be inside a cast-in circle with equal division blocks around the date in the center. \\ | ||
| + | The division blocks will (most of the time) have dots stamped or blotted into the blocks to represent the month with the center number being the year. \\ | ||
| + | Knowing the year season helps a lot. Generally you can look to June or July being the start of the next year season for production parts. \\ | ||
| + | There most likely will be a layover between ending season and new season parts however. \\ | ||
| + | So those two months are just a general point. \\ | ||
| + | |||
| + | **Example**: | ||
| + | If you have a cam cover with a circle date code (90) for the year 1990, it could have been made for either 1990 or 1991 model applications. \\ | ||
| + | A circle date (90) and three division blocks blotted would indicate the part was cast in March, 1990 (late 1990 model season). \\ | ||
| + | The part will generally be made for a 1990 bike. \\ | ||
| + | A circle date (90) and eight division blocks blotted would indicate the part was cast in August, 1990 (early 1991 model season). \\ | ||
| + | The part will generally be made for a 1991 bike. \\ | ||
| + | Then compare features or known casting numbers, if applicable, for a positive year match. \\ | ||
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