Instrument and control functions
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3. Tighten the locknut to the specified
torque.
NOTICE:
Always tighten
the locknut against the adjust-
ing ring, and then tighten the
locknut to the specified
torque.
[ECA22760]
EAU67050
EXUP system
This model is equipped with Yamaha’s
EXUP (EXhaust Ultimate Power valve)
system. This system boosts engine
power by means of a valve that controls
exhaust flow within the exhaust cham-
ber.
NOTICE
ECA15611
The EXUP system has been set and
extensively tested at the Yamaha
factory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
1. Spring preload adjusting ring
2. Locknut
1. Distance A
1
(a)
(b)
2
1
Spring preload:
Minimum (soft):
Distance A = 0 mm (0.00 in)
Standard:
Distance A = 4 mm (0.16 in)
Maximum (hard):
Distance A = 9 mm (0.35 in)
Tightening torque:
Locknut:
25 N·m (2.5 kgf·m, 18 lb·ft)
BX4-9-E1_1.book 47 ページ ２０１８年４月２７日 金曜日 午後４時３分
