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Engine & Frame Serial Numbers
1968–1990 · All Models · MAICO Code Definitions
MAICO Code Definitions
| MC | Motocross |
| GP | Grand Prix (74.5) |
| NG | New Generation (75 / 75.5) |
| Magnum | 1978 New Motor Design — Motocross (76 / 77) |
| Magnum E | Enduro Model |
| M1 | 1980 Mega |
| Mega 2 | Motocross Model |
| Mega E | Enduro Model |
| SC | Super Cross (1984) |
| LC | Liquid Cooled |
Engine Code Definitions
These letters precede the engine serial numbers
| T | Close ratio transmission (Sq. Barrel) |
| S | Wide ratio transmission (Sq. Barrel) |
| U | Close ratio transmission (Radial) |
| K | Wide ratio transmission (Radial) |
| M | 250 Close ratio transmission |
| R | 400 – 440 Close ratio transmission |
| G | 400 – 440 Wide ratio transmission |
| MT | Countershaft moved back on motor, closer to swing arm pivot. (250 MX started 1978) |
| RT | Countershaft moved back on open class motors. (400, 440, 490cc MX) |
| GT | Countershaft moved back on Enduro models |
Serial Number Reference — All Years
Grouped by era · 76 total records
1968 – 1977
Early MC Series — Square Barrel & Radial| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1968 | MC 250 | 380 000 | S or T 272–273 000 |
| 1968 | MC 360 | 380 000 | — |
| 1969 | MC 250 | 380 000 | S or T 273 000 |
| 1969 | MC 360 | 380 000 | — |
| 1970 | MC 250 | 381 000 | S or T 274–400 000 |
| 1970 | MC 400 | 381 000 | S or T 400 000 |
| 1971 | MC 250 | 382 000 | S or T 275 000 |
| 1971 | MC 400 | 382 000 | S or T 402 000 |
| 1971 | MC 501 | 501 000 | S or T 501 000 |
| 1972 (Sq. Barrel) | MC 250 | 387 000 | S or T 276 000 |
| 1972 (Sq. Barrel) | MC 400 | 387 000 | S or T 403 000 |
| 1972 (Radial) | MC 400 | 387 000 | K or U 403 000 |
| 1973 | MC 250 | 390 000 | K or U 275 000 |
| 1973 | MC 400 | 390 000 | K or U 405 000 |
| 1973 | MC 501 | 501 000 | K or U 501 000 |
| 1974 | MC 250/4 | 391 000 | K or U 278 000 |
| 1974 | MC 400/4 | 391 000 | K or U 407 000 |
| 1974 | MC 440/4 | 391 000 | K or U 441 000 |
| 1974.5 GP | MC 250/4 | 393 500 | K or U 278 000 |
| 1974.5 GP | MC 400/4 | 393 500 | K or U 407 000 |
| 1974.5 GP | MC 440/4 | 393 500 | K or U 441 000 |
| 1975 | MC 250/5 | 321 0000 | M 321 0000 |
| 1975 | MC 400/4 | 321 0000 | U 407 000 |
| 1975 | MC 440/4 | 321 0000 | U 441 000 |
| 1975.5 | MC 400/5 | 323 0000 | R 323 0000 |
| 1975.5 | MC 440/5 | 324 0000 | R 324 0000 |
| 1976 AW | MC 250/5 | 326 0000 | M 321 0000 |
| 1976 AW | MC 400/5 | 327 0000 | R 323 0000 |
| 1976 AW | MC 440/5 | 328 0000 | R 324 0000 |
| 1977 AW | MC 250/5 | 330 0000 | M 321 0000 |
| 1977 AW | MC 400/5 | 330 0000 | R 323 0000 |
| 1977 AW | MC 440/5 | 330 0000 | R 324 0000 |
NOTE:Around S.N. 393 500 Became GP's
1978 – 1979
Magnum / Magnum E| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1978 Magnum | MC 250/T | 336 0000 | MT 336 0000 |
| 1978 Magnum | MC 400/T | 337 0000 | RT 337 0000 |
| 1978 Magnum | MC 440/T | 338 0000 | RT 338 0000 |
| 1979 Magnum II | MC 125/T | 340 000 | 340 000/83 |
| 1979 Magnum II | MC 250/T | 341 0000 | MT 336 0000 |
| 1979 Magnum II | MC 400/T | 341 0000 | RT 337 0000 |
| 1979 Magnum II | MC 440/T | 341 0000 | RT 338 0000 |
| 1979 Magnum E | GS 250 | 241 0000 | GT 236 0000 |
| 1979 Magnum E | GS 400 | 242 0000 | GT 237 0000 |
| 1979 Magnum E | GS 440 | 243 0000 | GT 238 0000 |
NOTE:The Enduro model bikes were sold as 1980's as well. There were a small amount of models sold with 504-engine size.
1980
Mega| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1980 Mega | MC 250/T | 346 0000 | MT 346 0000 |
| 1980 Mega | MC 400/T | 347 0000 | RT 347 0000 |
| 1980 Mega | MC 440/T | 348 0000 | RT 348 0000 |
1981
Mega 2| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1981 Mega 2 | MC 250/T | 350 0000 | MT 350 0000 |
| 1981 Mega 2 | MC 400/T | 351 0000 | RT 351 0000 |
| 1981 Mega 2 | MC 490/T | 351 0000 | RT 352 0000 |
| 1981 Mega 2 | MC 440/T | 348 0000 | RT 348 0000 |
NOTE:Some 1981 MAICOs were built with 440 motors but not advertised in brochures. They have later style top tubes/backbones (NON Mega form frame).
1982
Alpha 1 / Alpha E| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1982 Alpha 1 | MC 250/T | 353 0000 | MT 353 0000 |
| 1982 Alpha 1 | MC 490/T | 354 0000 | RT 354 0000 |
| 1982 Alpha E | GS 250 | 253 0000 | GT 253 0000 |
| 1982 Alpha E | GS 490 | 254 0000 | GT 254 0000 |
1983
Spider| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1983 Spider | MC 250 | 361 0000 | C 361 0000 |
| 1983 Spider (4 Spd.) | MC 490 | 362 0000 | FK 362 0000 |
| 1983 Spider (4 Spd.) | MC 490 | 362 0000 | FL 362 0000 |
| 1983 Spider (5 Spd.) | MC 490 | 362 0000 | D 362 0000 |
1984 – 1990
SC / GM / M-Star Era| YEAR | MODEL | CHASSIS | MOTOR |
|---|---|---|---|
| 1984 | SC 250 LC | 363 0000 | 363 0000 |
| 1984 | SC 490 | 364 0000 | H or HE 364 0000 |
| 1985 | GM 250 LC | 365 0000 | H 365 0000 |
| 1985 | GM 500 LC | 366 0000 | H 366 0000 |
| 1986 | GM 250 Star | 367 0000 | H 367 0000 |
| 1986 | GM 500 Star | 368 0000 | H 368 0000 |
| 1986 | GM 530 Star SC | 369 0000 | — |
| 1987 | GM 250 GP | 370 0000 | — |
| 1987 | GM 400 GP | 371 0000 | — |
| 1987 | GM 500 GP | 372 0000 | — |
| 1987 | GM 550 SC | 373 0000 | — |
| 1988 | MC 250 | 380 0000 | — |
| 1988 | MC 320 | 381 0000 | — |
| 1988 | MC 500 | 382 0000 | — |
| 1989 | MC 250 | 390 0000 | — |
| 1989 | MC 320 | 390 0000 | — |
| 1989 | MC 500 | 390 0000 | — |
| 1990 | MC 250 | 394 0000 | — |
| 1990 | MC 320 | 395 0000 | — |
NOTE:Sold in Europe as MAICOs, but in the US they were sold as M-stars.