Yamaha YZ450F 2020 Owner's Service Manual page 57

Shock absorber
Spring preload
Adjusting system
Adjustment value (Soft)
Adjustment value (STD)
Adjustment value (Hard)
Rebound damping
Adjusting system
Unit for adjustment
Adjustment value from the start position
(Soft)
Adjustment value from the start position
(STD)
Adjustment value from the start position
(Hard)
Compression damping
Adjusting system
Fast compression damping
Unit for adjustment
Adjustment value from the start position
(Soft)
Adjustment value from the start position
(STD)
Adjustment value from the start position
(Hard)
Slow compression damping
Unit for adjustment
Adjustment value from the start position
(Soft)
Adjustment value from the start position
(STD)
Adjustment value from the start position
(Hard)
Swingarm
Swingarm end free play limit (radial)
Swingarm end free play limit (axial)
Drive chain
Size
Chain type
Number of links
Drive chain slack (Maintenance stand)
15-link length limit
CHASSIS SPECIFICATIONS
Gas-hydraulic damper
Mechanical adjustable type
1.5 mm (0.06 in)
4.0 mm (0.16 in) (AUS, CAN, NZL, ZAF) 
7.0 mm (0.28 in) (AUT, BEL, CHE, CYP, CZE,
DEU, DNK, ESP, FIN, FRA, GBR, GRC, HRV,
HUN, IRL, ITA, NLD, NOR, POL, PRT, SVK,
SVN, SWE, TUR)
18.0 mm (0.71 in)
Mechanical adjustable type
Click
30
11 (AUS, CAN, NZL, ZAF)
12 (AUT, BEL, CHE, CYP, CZE, DEU, DNK,
ESP, FIN, FRA, GBR, GRC, HRV, HUN, IRL,
ITA, NLD, NOR, POL, PRT, SVK, SVN, SWE,
TUR)
0
Mechanical adjustable type
Turn
2
1
0
Click
20
9
0
1.0 mm (0.04 in)
0.2–0.9 mm (0.01–0.04 in)
520
Non-sealed type
114
50.0–60.0 mm (1.97–2.36 in)
242.9 mm (9.56 in)
2-8