Edelbrock Automobile Parts YFZ450 User Manual

Twist Throttle Instructions  
INSTRUCTION SUPPLEMENT FOR 2004-  
LATER YAMAHA YFZ450  
1. Install the throttle cables into the supplied  
throttle housing and place onto clean  
handlebar end.  
Removing stock carburetor and cables.  
2. Route throttle cables through frame as stock  
cable was routed.  
3. Install the pull cable into the 8:00 position  
and the return cable end into the 11:00  
position of the cable wheel. Secure cables  
to cable bracket by replacing end piece and  
Phillips screw. See figure 2.  
1. Remove seat and gas tank. Make sure fuel  
petcock is in “off” position.  
2. Remove throttle cable paying close attention  
to routing, as the new cable(s) will need too  
be routed the same.  
NOTE: SEE FIGURE 1 TO IDENTIFY CABLES.  
The bottom cable is the pull cable.  
3. Remove stock carburetor and stock throttle  
housing. Stuff a clean, dry rag into manifold  
to keep debris out of motor.  
Figure1.  
IMPORTANT NOTE: This machine is equipped  
with a throttle over-ride system (TORS) and a  
neutral safety switch. You must unplug the  
TORS  
From the wiring harness located near the  
steering stem top mount. The neutral safety  
switch located on the clutch perch must also be  
removed and unplugged. Once unplugged,  
tape the two wires together that come out of the  
wiring harness.  
Figure 2.  
Carburetor installation  
1. Carefully trim the rubber alignment tab off of  
the face of the manifold with a razor blade or  
side cutters.  
2. Remove the hex pipe plug from the carb cap  
using a 11mm or 7/16 wrench. Do not  
discard plug, as it will be needed later.  
Install the metering adjustment tool included  
in the hardware kit. Do not over-tighten as  
damage may occur to cap.  
Thumb Throttle Instructions  
NOTE: Modification of the stock thumb  
throttle housing will be required in order to  
achieve wide open throttle. Figure 3 will  
show the mods.  
1. Attach fuel line to carburetor and secure with  
clamp.  
2. Place carburetor into manifold and air boot.  
Tighten clamps with carb sitting as close to  
vertical as possible.  
Figure 3.  
 

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