Basic lever (doohickey) kit with torsion spring and drill bit
Yes, the klr650 doohickey mod is necessary. You don't want to find what I did. - Old & new : r/Dualsport
Klr650 Balancer Idle Lever And Spring For Kawasaki Klr650 1987-2018 Idle-shaft Lever & Spring Replaces W/torsion Spring - Covers & Ornamental Mouldings - AliExpress
KLR650 Balancer Idler Lever Upgrade Tools ($12.95+)