KTM RC 390 2020 Owner's Manual page 125

Main work
–
Shift the transmission to neutral position.
–
In the area after the chain sliding guard, press the chain
upward toward the link fork and measure chain tension
Info
Top chain section
Chain wear is not always even, so you should repeat
this measurement at different chain positions.
Chain tension
» If the chain tension does not meet the specification:
–
Adjust the chain tension. (
–
Remove the rear of the motorcycle from the lifting gear.
( p. 110)
V00168-10
SERVICE WORK ON THE CHASSIS 13
B
must be taut.
5 ... 7 mm (0.2 ... 0.28 in)
p. 124)
A
.
123