Here is the center stand spring of MBK BOOSTER and YAMAHA BW'S from 2004, offered by the brand YAMAHA.
Handy if your spring gets rusty or just lost, broken ...
Mounts on :
MBK BOOSTER (50cc) from 2004 to 2019
MBK SPIRIT from 2003
YAMAHA BW'S (50cc) from 2004 to 2019