1975-1985 Suzuki RM Model Serial Numbers
| Model | Frame Number | Engine Number | |
| 1975 | RM125M | RM125-10001 – 30000 | RM125-10001 |
| *This is a mid-year model identified by the down-pipe. | |||
| 1975 | RM125S | RM125-19800 – ? | RM125-19800 – ? |
| 1976 | TM75A | TM75-27488 to RM80B | TM75-27778 to RM80B |
| RM100A | RM100-10001 to 16021 | RM100-10001 to 16023 | |
| RM125A | RM125-30001 to 43982 | Not Applicable | |
| RM250A | RM250-10001 to 20994 | RM250-10001 to 21012 | |
| RM370A | RM370-10002 to 17938 | RM370-10002 to 17945 | |
| 1977 | RM80B | RM80-10001 to 23348 | RM80-10001 to 23634 |
| RM100B | RM100-16022 to 23119 | RM100-16024 to 23133 | |
| RM125B | RM125-43983 to 61850 | RM125-44045 to 62012 | |
| RM250B | RM250-20995 to 26795 | RM250-21013 to RM250C | |
| RM370B | RM370-17939 to RM400C | RM370-17946 to RM400C | |
| 1978 | RM80C | RM80-23349 to 39432 | RM80-23635 to 39469 |
| RM100C | RM100-23120 to 28311 | RM100-23134 to 28327 | |
| RM125C | RM125-61851 to 84328 | RM125-62013 to 84644 | |
| RM250C | RM250-26795 to 30641 | RM250- N/A to 307699 | |
| RM250C2 | RM250-30642 to 38833 | RM250-30700 to 39102 | |
| RM400C | RM400-100001 to 105659 | RM400-100009 to 105680 | |
| 1979 | RM60N | RM60-100024 to 102730 | RM60-100024 to 102730 |
| RM80N | RM80-39433 to 200009 | RM80-39470 to 200067 | |
| RM100N | RM100-28312 to 33043 | RM100-28328 to 27821 | |
| RM125N | RM125-84328 to 102502 | RM125-84645 to 83086 | |
| RM250N | RM250-38834 to 43891 | RM250-39103 to 44024 | |
| RM400N | RM400-105660 to 109716 | RM400-105681 to 109784 | |
| 1980 | RM50T | RM50-110854 to ? | RM50-110894 to ? |
| RM60T | RM60-102731 to JS1RB11A_B_100000 | RM60-102731 to N/A | |
| RM80T | RM80-20001- to JS1RD11A_D_100000 | RM80-200068 to N/A | |
| RM100T | RM100-33044 to JS1RE11A_B_100000 | RM100-27822 to N/A | |
| RM125T | RM125-102503 to JS1RF11A_B_100000 | RM125-83087 to N/A | |
| RM250T | RM250-43892 to JS1RJ11A_B_100000 | RM250-44025 to N/A | |
| RM400T | RM400-109717 to RM465X | RM400-109785 to N/A | |
| 1981 | JR50X | LN1JA11A_B_100001 to LN1JA11A_C_100000 | JR50-______ |
| RM60X | JS1RB11A_B_100001 to JS1RB11A_C_100001 | RM60-______ | |
| RM80X | JS1RD11A_B_100001 to JS1RD12A_C_100001 | RM80-______ | |
| RM100X | JS1RE11A_B_100001 to N/A (no RM100 built in 1982) | RM100-______ | |
| RM125X | JS1RF11A_B_100001 to JS1RF11A_C_100001 | RM125-______ | |
| RM250X | JS1RJ11A_B_100000 to JS1RJ12A_C_100001 | RM250-______ | |
| RM465X | JS1RM11A_B_100001 to JS1RM11A_C_100001 | RM465-______ | |
| 1982 | JR50Z | LN1JA11A_C_100001 to LN1JA13A_D_100000 | JR50-______ |
| RM60Z | JS1RB11A_C_100001 to JS1RB11A_D_100001 | RM60-______ | |
| RM80Z | JS1RD12A_C_100001 to JS1RD13A_D_100001 | RM80-______ | |
| RM125Z | JS1RF11A_C_100001 to JS1RF11A_D_100001 | RM125-______ | |
| RM250Z | JS1RJ12A_C_100001 to JS1RJ12A_D_100001 | RM250-______ | |
| RM465Z | JS1RM11A_C_100001 to 1983 RM500 | RM465-______ | |
| 1983 | JR50RD | LN1JA13A_D_100001 to LN1JA13A_F1100001 | A102-______ |
| RM60D | JS1RB11A_D_100001 to N/A (no RM60 built in 1984) | RM60-______ | |
| RM80D | JS1RD13A_D_100001 to JS1RD13A_E_100001 | D101-______ | |
| RM125D | JS1RF11A_D_100001 to JS1RF12A_E_100001 | F106-______ | |
| RM250D | JS1RJ12A_D_100001 to JS1RJ12A_E_100001 | J102-______ | |
| RM500D | JS1RM12A_D_100001 to JS1RM12A_E_100001 | M101-______ | |
| 1984 | JR50 | Not built in 1984. | N/A |
| RM60 | Not built in 1984. | N/A | |
| RM80E | JS1RD13A_E_100001 to JS1RD13A_F2100001 | D101-______ | |
| RM125E | JS1RF12A_E_100001 to JS1RF12A_F2100001 | F108-______ | |
| RM250E | JS1RJ12A_E_100001 to JS1RJ12A_F2100001 | J102-______ | |
| RM500E | JS1RM12A_E_100001 | M101- ______ | |
| 1985 | JR50F | LN1JA13A_F1100001 to LN1JA13A_G1100001 | A102-______ |
| RM80F | JS1RD13A_F2100001 to JS1RD14A_G2100001 | D101-______ | |
| RM125F | JS1RF12A_F2100001 to JS1RF13A_G2100001 | F108-______ | |
| RM250F | JS1RJ12A_F2100001 to JS1RJ13A_G2100001 | J102-______ | |
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