3. Adjustments
USE AND MAINTENANCE MANUAL
CHAPTER 3
ADJUSTMENTS
4-Strokes - Edition 00 / 2022
94
1
2
C
– With the vehicle on the ground, hold it and get the driver
on board, making sure he/she is wearing all the protective
clothing available. Then measure the sinking “C” between
the centre of the rear wheel axle and the rear mudguard
locking bolt.
Standard value: 90-100mm
– If the measured value is not included within the standard
range, adjust it by loosening locknut “1”. Now turn the ring
nut “2” of the spring, screwing it in to give more preload
(less thrust) and unscrewing it to give less preload (more
thrust);
– Repeat the measurement and adjustment operations until
the standard value is reached. Once reached, tighten the
locknut “1”.
Before adjusting, make sure to remove all mud and
dirt around the ring nut and lock nut.
If the vehicle is new and has run-in, the same spring
length set may vary due to initial spring fatigue.
Therefore be sure to perform a new evaluation.
In case it is not possible to reach the standard value
through ring nut adjustment, replace the shock
absorber spring with a spring having a different load
coefficient. If the ring nut is in the highest position
(lower preload) but the sag value is lower than
the standard value, choose a spring with a lower
coefficient. Conversely, if the spring is in the lowest
position but the sag value is higher than the standard
value, choose a spring with a higher coefficient.
To improve the rear shock absorber performance, and adapt it to different road conditions, riding style and rider’s
weight, Fantic features springs with different load coefficients that can be purchased from authorized dealers.
Load factor
Part number
XXF 250
XXF 450
XEF 250
XEF 450
48 N/mm
07147005
√
√
√
√
50 N/mm
07146005
√
√
√
√
52 N/mm
07141005
√
√
√
√
54 N/mm
07142005
√
√
√
√
56 N/mm
07143005
√
√
√
√
58 N/mm
07144005
√
√
√
√
60 N/mm
07145005
√
√
√
√
