This bulletin will give you information on a new Sprocket Kit used to increase acceleration

Gear ratios

1981 XJ650LH - Drive Shaft

1964 MJ2 - Rear Arm - Chain Case

SB156    90-0012063500   TBK-635

YAMAHA AT CT DT HT JT RT SR433 SR643 YM Switch Holder 214-83974-00 150-83974-00 146-83974-00 yamaha driver footrest This bulletin will give youYAMAHA Handle Switch Holder OEM Ref. # 214 83974 00 150 83974 00 146 83974 00 NOS New Old Stock. SB103 D Fits 1962 YDS2 Electrical 1963 YDS2 Electrical 1964 YDS3 Electrical And Cables 1965 YDS3 Electrical And Cables 1965 YDS3C Electrical And Cables 1965 YM1 Electrical And Cables 1966 YDS3 Electrical And Cables 1966 YDS3C Electrical And Cables 1966 YM1S Electrical And Cables 1968 DT1 Handle & Wire 1969 AT1E Handle & Wire 1969 AT1M Handle & Wire 1969