Just
In Case You're Wondering What That Old Bike Really Is
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![]() Wow, a real YZ race bike. But what is it? Read on. |
It also seemed that most of the emails were concerning the old Yamahas. And why not? Yamaha was the first company to come out with a full line of real dirt bikes for the masses.
Not exotic European stuff that required insiders knowledge to keep running, but low-cost, well built, reliable bikes that would keep running in spite of heavy-handed abuse and complete neglect in the maintenance department.
![]() Numbers on the steering head gone? Don't worry. There are also numbers on the motor that can help you. |
Lots of people learned to ride on the legendary Mini-Enduros, and thousands more cut their teeth on one or another version of the DT-1.
This guide covers most of the stuff from the late 60s up to 1980. There are a few models missing I guess, but after too many hours of scouring the manuals and the web, I figured there's enough here to help most of the folks out there who remain confused.
So have fun and let your fingers do the walking.
YAMAHA
MODEL INDENTIFICATION NUMBERS CHART
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1971 MINI ENDURO | |||
JT1 | SERIAL # JT1-000101 - 041708 | ||
JT1 | SERIAL # JT1L-200101 - 201152 W/LIGHTS | ||
1972 MINI ENDURO | |||
JT2 COMPETITION | SERIAL # JT1-050101 - 071150 | ||
JT2 | SERIAL # JT1-300101 - 330000 W/LIGHTS | ||
1974 YZ A | |||
YZ 80 A | SERIAL # 462-000101 - 009661 | ||
YZ 125 A | SERIAL # 453-000101 - 007730 | ||
YZ 250 A | SERIAL # 431-000101 - 004104 | ||
YZ 360 A | SERIAL # 432-000101 - 000631 | ||
1975 YZ B | |||
YZ 80 B | SERIAL # 492-000101 - 018570 | ||
YZ 125 B | SERIAL # 453-100101 - 101620 | ||
YZ 250 B | SERIAL # 483-000101 - 002759 | ||
YZ 360 B | SERIAL # 484-000101 - 001459 | ||
1976 YZ C | |||
YZ 100 C | SERIAL # 1J4-000101 - 003470 | ||
YZ 125 C | SERIAL # 537-000101 - 014044 | ||
YZ 125 X | SERIAL # 1G8-000101 - 007120 | ||
YZ 175 C | SERIAL # 1L8-000101 - 001610 | ||
YZ 250 C | SERIAL # 509-100101 - 103405 | ||
YZ 400 C | SERIAL # 510-100101 - 102838 | ||
1977 YZ D | |||
YZ 100 D | SERIAL # 1J4-000101 - 103550 | ||
YZ 125 D | SERIAL # 1W1-000101 - 015610 | ||
YZ 250 D | SERIAL # 1W3-000101 - 006520 | ||
YZ 400 D | SERIAL # 1W4-000101 - 006720 | ||
1978 YZ E | |||
YZ 100 E | SERIAL # 2K5-000101 - 006572 | ||
YZ 125 E | SERIAL # 2K6-000101 - 015080 | ||
YZ 250 E | SERIAL # 2K7-000101 - 009850 | ||
YZ 400 E | SERIAL # 2K8-000101 - 007406 | ||
1979 YZ F | |||
YZ 100 F | SERIAL # 2W5-000101 - N/A | ||
YZ 125 F | SERIAL # 2X3-000101 - N/A | ||
YZ 250 F | SERIAL # 2X4-000101 - N/A | ||
YZ 400 F | SERIAL # 2X5-000101 - N/A | ||
1980 YZ G | |||
YZ 100 G | SERIAL # 3R2-000101 - ON | ||
YZ 125 G | SERIAL # 3R3-000101 - ON | ||
YZ 250 G | SERIAL # 3R4-000101 - ON | ||
YZ 465 G | SERIAL # 3R5-000101 - ON | ||
LT SERIES | |||
LTMX | Year: 1973 | Start Engine#: LT2-105101 | |
MX SERIES | |||
MX100B | Year: 1975 | Start Engine#: 427-100101 | |
MX100F | Year: 1979 | Start Engine#: 3M1-000101 | |
MX100G | Year: 1980 | Start Engine#: 3T0-000101 | |
MX125 | Year: 1973 | Start Engine#: AT1-325101 | |
MX125A | Year: 1974 | Start Engine#: 402-000101 | |
MX125B | Year: 1975 | Start Engine#: 402-100101 | |
MX125C | Year: 1976 | Start Engine#: 565-000101 | |
MX175A | Year: 1974 | Start Engine#: 455-000101 | |
MX175B | Year: 1975 | Start Engine#: 455-100101 | |
MX175F | Year: 1979 | Start Engine#: 3M2-000101 | |
MX175G | Year: 1980 | Start Engine#: 3M2-100101 | |
MX250 | Year: 1973 | Start Engine#: 364-000101 | |
MX250A | Year: 1974 | Start Engine#: 364-020101 | |
MX250B | Year: 1975 | Start Engine#: 509-000101 | |
MX360 | Year: 1973 | Start Engine#: 365-000101 | |
MX360A | Year: 1974 | Start Engine#: 365-020101 | |
MX400B | Year: 1975 | Start Engine#: 510-000101 | |
AT SERIES | |||
AT1 | Year: 1969 | Start Engine#: AT1-100101 | |
AT1B | Year: 1970 | Start Engine#: AT1-120101 | |
AT1BMX | Year: 1970 | Start Engine#: AT1-310101 | |
AT1C | Year: 1971 | Start Engine#: AT1-139101 | |
AT1M | Year: 1969 | Start Engine#: AT1-300101 | |
AT1MX | Year: 1971 | Start Engine#: AT1-313101 | |
AT2 | Year: 1972 | Start Engine#: AT1-165101 | |
AT2M | Year: 1972 | Start Engine#: AT1-317101 | |
AT3 | Year: 1973 | Start Engine#: AT1-200101 | |
CT SERIES | |||
CT1 | Year: 1971 | Start Engine#: CT1-000101 | |
CT1B | Year: 1970 | Start Engine#: CT1-010101 | |
CT1C | Year: 1971 | Start Engine#: CT1-200101/CT1-032101 | |
CT2 | Year: 1972 | Start Engine#: CT1-065101 | |
CT3 | Year: 1973 | Start Engine#: CT1-100101 | |
DT SERIES | |||
DT100A | Year: 1974 | Start Engine#: 437-000101 | |
DT100B | Year: 1975 | Start Engine#: 437-100101 | |
DT100B5 | Year: 1975 | Start Engine#: 540-000101 | |
DT100C | Year: 1976 | Start Engine#: 558-000101 | |
DT100D | Year: 1977 | Start Engine#: 1T9-000101 | |
DT100E | Year: 1978 | Start Engine#: 2F5-000101 | |
DT100F | Year: 1979 | Start Engine#: 2F5-050101 | |
DT100G | Year: 1980 | Start Engine#: 3A3-000101 | |
DT125A | Year: 1974 | Start Engine#: 444-000101 | |
DT125B | Year: 1975 | Start Engine#: 444-100101 | |
DT125C | Year: 1976 | Start Engine#: 560-000101 | |
DT125E | Year: 1978 | Start Engine#: 2A6-000101 | |
DT125F | Year: 1979 | Start Engine#: 2N4-000101 | |
DT125G | Year: 1980 | Start Engine#: 3J0-000101 | |
DT175A | Year: 1974 | Start Engine#: 443-000101 | |
DT175B | Year: 1975 | Start Engine#: 443-100101 | |
DT175C | Year: 1976 | Start Engine#: 559-000101 | |
DT175D | Year: 1977 | Start Engine#: | |
DT175E | Year: 1978 | Start Engine#: 2A7-000101 | |
DT175F | Year: 1979 | Start Engine#: 2N5-000101 | |
DT175G | Year: 1980 | Start Engine#: 3J1-000101 | |
DT1 | Year: 1968 | Start Engine#: DT1-00101 | |
DT1B | Year: 1969 | Start Engine#: DT1-15001 | |
DT1C | Year: 1970 | Start Engine#: DT1-50101 | |
DT1CM | Year: 1970 | Start Engine#: DT1-95101 | |
DT1E | Year: 1971 | Start Engine#: DT1F-00101/DTF-020101 | |
DT1MX | Year: 1971 | Start Engine#: DT1F-090101 | |
DT2 SERIES | |||
DT2 | Year: 1972 | Start Engine#: DT1F-105101 | |
DT250A | Year: 1974 | Start Engine#: 450-000101 | |
DT250B | Year: 1975 | Start Engine#: 450-200101 | |
DT250C | Year: 1976 | Start Engine#: 450-500101 | |
DT250D | Year: 1977 | Start Engine#: 1M1-000101 | |
DT250E | Year: 1978 | Start Engine#: 1M1-100101 | |
DT250F | Year: 1979 | Start Engine#: 2N6-000101 | |
DT2M | Year: 1972 | Start Engine#: DT1F-185101 | |
DT3 SERIES | |||
DT3 | Year: 1973 | Start Engine#: DT1F-135101 | |
DT360A | Year: 1974 | Start Engine#: 446-000101 | |
DT400C | Year: 1976 | Start Engine#: 501-200101 | |
DT4 SERIES | |||
DT400D | Year: 1977 | Start Engine#: 1M2-000101 | |
DT400E | Year: 1978 | Start Engine#: 1M2-100101 |