Yamaha JT1 Series Service Manual page 4

MOOEL IDENTIFICATION
This manual was originally printed for the JT2 Mini-Enduro. It has been edited to
include information for the JT1, JT1 Land JT2M models.
Generally speaking, there were no major changes to any of the Mini-Enduro models
since the JT1 was released for the 1971 model year. The JT1 L (1971½ release) was
a JT1 with lighting kit. The JT2 had various internal engine changes to improve
reliability and carburetor changes to improve performance. JT2 lights were
upgraded in intensity. The JT2M was styled after the JT1 for those people who
wanted a Mini-motocrosser without lights. Additional identification information is
given in the table below.
IBM ID
STARTING IDENTIFYING
MOOEL YEAR NUMBER
ENGINE
NUMBER COLOR
JT1 1971 288
JT1-000101 Desert Orange
JT1 L 1971(½) 338
JT1-200101 Desert Orange
JT2 1972 288
JT1-050101 Mandarin Orange
JT2M 1972 288
JT1-300101 Competition Yellow