Yamaha YZ450FX 2021 Owner's Service Manual page 65

1. Negative battery lead
2. Starter motor lead
3. Holder
4. Coolant temperature sensor coupler
5. Radiator fan motor lead (OPTION)
6. Radiator fan motor lead coupler (OPTION)
7. Start switch coupler
8. Cable guide
9. Start switch lead
10.Joint coupler
11.Throttle position sensor coupler
12.Radiator breather hose
13.Radiator hose
14.Fuel hose
15.Fuel pump coupler
16.Resistor coupler
17.Cross tube
18.Wire harness
19.Fuel tank
20.Rubber damper
21.Rear frame
22.Side cover
23.Bracket
A. Adjust any slack between the rear shock
absorber and the clamp of the side cover.
B. After connecting the coolant temperature
sensor 2-pin coupler (black), install the cou-
pler cover over the holder securely.
C. 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.
D. Make sure the cable guide has contact with
the stamped location of the vehicle identifica-
tion number, and install it.
E. 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.
F. After connecting the throttle position sensor
coupler, attach the cover.
G. The radiator breather hose should be routed
in the following order and via each mentioned
point.
The upper radiator boss at the rear of the
vehicle 
The lower radiator boss at the front of the
vehicle 
The radiator hose at the front of the vehicle 
For routing the remaining leads, refer to the
diagram "W" under "Frame and engine (left
side view)".
H. Route the fuel hose in front of the fuel pump.
I. After connecting the fuel pump coupler,
attach the cover.
CABLE ROUTING DIAGRAM
J. Fasten the starter relay lead and starter
motor lead with the plastic locking tie within
the range of the cross tube width. Make sure
that the locking portion of the plastic locking
tie faces to the lower side of the vehicle and
put it inside the rear frame without cutting off
the end.
K. Route the starter motor lead inside of the rear
frame and along the rear fender.
L. Place the resistor coupler under the starter
relay.
M. The routing order of leads not indicated does
not matter.
N. 20 mm (0.7874 in)
O. Fasten the wire harness at the white tape
position using the plastic locking tie.
P. Position the lock part of the plastic locking tie
to downward of the vehicle. Cut the end of
the plastic locking tie.
Q. Fasten the bracket to the tank rail (right)
using the rivet.
R. Upward
S. When installing the engine ground lead termi-
nal, it can face either way.
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