Malaguti Dune X 125 Service Station Manual page 212

Chassis
The vehicle has a chain with a 1/2" pitch closed
using a link.
With wear, the chain lengthens. Replace the chain
if there is lengthening equal to or more than 2%.
To check the chain wear, use the Ognibene
529510001 ruler and follow the instructions below:

Tension the chain

Place the Ognibene 529510001 ruler
on the chain rollers, in a section formed
by eight chain steps

Check that the measurement notches
between the mobile part and the fixed
part of the instrument match (1/2 step)
New chain:

the notch of the mobile measuring in-
strument coincides with the first notch
on the right of the fixed part of the in-
strument
Chain to be replaced:

the notch of the mobile measuring in-
strument coincides with the central
notch of the fixed part of the instrument
CHAS - 212
Dune 125 - Dune X 125 - Euro 4