| 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 ration 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 |
YEAR |
MODEL |
CHASSIS |
MOTOR |
1968 |
MC 250 |
380 000 |
S or T 272 000 |
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 274 000 |
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 | MC250/4 | 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 | Around S.N. |
393 500 | Became GP's |
| 1974.5 | MC250/4 | 393 500 | K or U 278 000 |
| 1974.5 | MC 400/4 | 393 500 | K or U 407 000 |
1974.5 |
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 |
MC 250/5 AW |
326 0000 |
M 321 0000 |
1976 |
MC 400/5 AW |
327 0000 |
R 323 0000 |
1976 |
MC 440/5 AW |
328 0000 |
R 324 0000 |
1977 |
MC 250/5 AW |
330 0000 |
M 321 0000 |
1977 |
MC 400/5 AW |
330 0000 |
R 323 0000 |
1977 |
MC 440/5 AW |
330 0000 |
R 324 0000 |
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 |
MC400/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 |
The Enduro model bikes were sold as 1980's as well
There were a small amount of models sold with 504-engine size
| 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 | 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 |
Some 1981 MAICO/s were built with 440 motors but not advertised in brochures
They have later style top tubes/backbones (NON Mega form frame).
| 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 | 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 |
| 1983 Spider | MC 490 | 362 0000 | 362 0000 |
| 1984 | SC250LC | 363 0000 | 363 0000 |
| 1984 | SC490 | 364 0000 | H or HE364 0000 |
Sold in Europe as MAICO's, but in the US they were sold as M-stars
| YEAR | MODEL | CHASSIS | MOTOR |
| 1985 | GM 250LC | 365 0000 | H 365 0000 |
| 1985 | GM 500LC | 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 |