2000 YAMAHA WR 400F weight

4 - 57
ENGBALANCER
REMOVAL POINTS
Balancer drive gear and balancer driven
gear
1. Straighten the lock washer tab.
2. Loosen:
lNut (primary drive gear) 1
lNut (balancer) 2
NOTE:
Place an aluminum plate 3 between the teeth
of the balancer drive gear 4 and driven gear
5.
Balancer
1. Remove:
lBalancer 1
NOTE:
When removing the balancer shaft, align the
center of the balancer shaft weight a along
the line connecting the centers of the crank-
shaft and balancer shaft.
INSPECTION
Primary drive gear, balancer drive gear and
balancer driven gear
1. Inspect:
lPrimary drive gear 1
lBalancer drive gear 2
lBalancer drive gear 3
Wear/damage ® Replace.
Balancer
1. Inspect:
lBalancer
Cracks/damage ® Replace.

4 - 58
ENGBALANCER
ASSEMBLY AND INSTALLATION
Balancer, balancer drive gear and balancer
driven gear
1. Install:
lBalancer 1
NOTE:
When installing the balancer shaft, align the
center of the balancer shaft weight a along
the line connecting the centers of the crank-
shaft and balancer shaft.
2. Install:
lBalancer driven gear 1
NOTE:
Install the balancer driven gear onto the bal-
ancer while aligning the punch mark a on the
balancer driven gear with the protrusion b on
the balancer end.
3. Install:
lStraight key 1
lBalancer drive gear 2
lPrimary drive gear 3
NOTE:
Align the punched mark a on the balancer
drive gear with the punched mark b on the
balancer driven gear.
4. Install:
lLock washer 1
lNut (balancer) 2
lNut (primary drive gear) 3
NOTE:
Place an aluminum plate 4 between the teeth
of the balancer drive gear 5 and driven gear
6.
5. Bend the lock washer tab.
T R..50 Nm (5.0 m · kg, 3.6 ft · lb)
T R..75 Nm (7.5 m · kg, 54 ft · lb)

7 - 14
TUNSETTING
2. Use of stiff spring
Generally a stiff spring gives a stiff riding
feeling. Rebound damping tends to
become weaker, resulting in lack of a
sense of contact with the road surface or
in a vibrating handlebar.
To set a stiff spring:
lChange the rebound damping.
Turn in one or two clicks.
lChange the compression damping.
Turn out one or two clicks.
Coverage of spring by weight
õRider weight
1Soft
2Standard
3Stiff

7 - 18
TUNSETTING
CAUTION:
When using a rear cushion other than cur-
rently installed, use the one whose overall
length a does not exceed the standard as
it may result in faulty performance. Never
use one whose overall length is greater
than standard.
Coverage of spring by weight
õRider weight
1Soft
2Standard
3Stiff
Length a of standard shock:
485.5 mm (19.11 in)