Yamaha WR450F 2021, Owner'S Service Manual, Page: 75 / 402

CABLE ROUTING DIAGRAM
2-22
1. Wire harness
2. Bracket
3. Joint coupler
4. Throttle position sensor coupler
5. Radiator breather hose
6. Radiator hose
7. Fuel hose
8. Fuel pump coupler
9. Joint coupler (rear side)
10.Resistor coupler
11.Negative battery lead
12.Cross tube
13.Starter motor lead
14.Fuel tank
15.Rubber damper
16.Rear frame
17.Side cover
18.Holder
19.Coolant temperature sensor coupler
20.Radiator fan motor lead
21.Radiator fan motor coupler
22.Start switch coupler
23.Clutch switch coupler
24.Clutch switch lead
25.Start switch lead
A. Insert the joint coupler into the plate and
secure it. After securing it, put the cover over
the joint coupler. The inserted portion of the
coupler should be hidden with the cover.
B. After connecting the throttle position sensor
coupler, attach the cover. Do not let the lead
and the cover enter the radiator fan.
C. The radiator breather hose should be routed
in the following order and via each mentioned
point.
The back side of the upper radiator boss


The front side of the lower radiator boss


The front side of the radiator hose

For routing the remaining leads, refer to the
diagram “V” under “Frame and engine (left
side view)”.
D. Upward
E. When installing the engine ground lead termi-
nal, it can face either way.
F. Route the fuel hose in front of the fuel pump.
G. After connecting the fuel pump coupler,
attach the cover.
H. Fasten the starter relay lead and the starter
motor lead together within the width of the
cross tube. Position the lock part of the plas-
tic locking tie to downward of the vehicle. Do
not cut the end but insert into the inside of the
rear frame.
I. Route the starter motor lead inside of the rear
frame and along the rear fender.
J. Place the resistor coupler under the starter
relay.
K. The routing order of leads not indicated does
not matter.
L. 20 mm (0.79 in)
M. Adjust any slack between the rear shock
absorber and the clamp of the side cover.
N. Fasten the wire harness at the white tape
position using the plastic locking tie.
O. Position the lock part of the plastic locking tie
to downward of the vehicle. Cut the end of
the plastic locking tie.
P. After connecting the water temperature sen-
sor 2-pin coupler (black), install the coupler
cover over the holder securely.
Q. Pass the radiator fan motor lead to the inside
of the tension arm (the side of the vehicle).
Either the radiator fan motor lead or the har-
ness side can face the outside where they
cross each other.
R. Fasten the bracket to the tank rail (right)
using the rivet.
S. Make sure the cable guide has contact with
the stamped location of the vehicle identifica-
tion number, and install it.
T. In no particular order.