RIEJU Marathon 125 AC EURO 4, Owner'S Manual, Page: 35 / 45

…for everyday adventure
Tango 125 E4
35
CHAIN ADJUSTMENT AND TENSION
The motorcycle must be positioned vertically with its wheels on
the firmly on the ground.
The chain must be adjusted to have a tolerance of 30 to 40 mm.
At the midpoint between the output gear and the rear sprocket
(see picture).
ATTENTION: The chain should be kept in perfect cleanliness
and be properly lubricated each week.
To adjust to the correct tension you must perform these steps on
both sides of the wheel:
1 - Set the gearbox in neutral and loosen the nuts (A) and (B).
2 - Using the bolts (C) adjust the chain tension, ensuring it is
always the same distance on both sides of the axle. To do so use
the rule marks on of the swing arm.
5 - Set the position using the 2 nuts (B) and tighten the nut (A)
that secures the rear wheel axle
A
B
C