Edelbrock TRX450R user manual

INSTRUCTION SUPPLEMENT FOR 2004-

LATER HONDA TRX450R

Removing stock carburetor and cables.

1. Remove seat, front fenders, rear fen ders
and gas tank. Make sure fuel petcock is
in “off” position. You will also need to
remove the three bolts holding airbox in
plac e. Loosen air boot hose clamp
around carburetor and slide airbox back.

2. Remove throttle cable paying close attention
to routing, as the new cable(s) will need too
be routed the same.

3. Remove stock carburetor and stock throttle
housing. Stuff a clean, dry rag into manifold
to keep debris out of motor.

IMPORTANT NOTE: This machine is equipped
with a throttle position sensor. Unplug TPS and
tape up connector to keep clean.

Twist Throttle Instructions

1. Install the throttle cables into the supplied
throttle housing and place onto clea n
handlebar end.

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.

NOTE: SEE FIGURE 1 TO IDENTIFY CABLES.
The bottom cable is the pull cable.

Figure1.

Fig ure 2.

Thumb Throttle Instructions

1. Threa d new throttle cable into housing and
insert cable end into throttle lever.

2. Install cable into cable wheel on carburetor
in the 8:00 position and secure cable into
lower slot on cable bracket by replacing end
piece and Phillips screw. See figure 3.

Figure 3.

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
disc ard 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.

3. Attach fuel line to carburetor and secure with
clamp.

4. Place carburetor into manifold and air boot.
Tighten clamps with carb sitting as close to
vertical as possible.

5. Lay cables in on top of plastic heat guard as
shown in figure 4.

Figure 4.

6. Adjust throttle cable to take up the slack in
the throttle. Note: When throttle cables are

properly adjusted, there should be
approx. 1/8” of free play in the throttle.

7. After throttle cables have been adjusted the
handle bars should be rotated from full right
stop to full left stop while opening and
closing throttle to ensure smooth operation.
Also check to make sure the cables do not
catch or bind on anything, i.e ., hand guards,
stabilizers.

8. Install fuel tank and connect fuel line to
petcock and secure with provided pinch

clamp. Do not bolt tank in place, as minor
adjustments may be necessary and my be
easier with the tank off.

9. Turn fuel petcock to “on” and check for
leaks.

10. Open throttle 3-5 times to prime accelerator
pump. Do not open throttle any more than
5 times as this may flood engine!!

11. Once pump is primed, If Motor will not fire
open idle ca ble ½ turn and repeat starting
process.

NOTE: If flooding occurs, slowly open
throttle to wide open and hold. With
throttle still open engage starter until
engine fires.

For any questions regarding tuning or
installation of Edelbrock products, please
call our toll free tech line M-F 8:00am-12:
30pm, 1:30pm-5:00pm PST.
877-888-7504 ext.2.

Edelbrock #3198 and #3199

TRX450R Carburetor Specifications

Bore Size: 40mm

Needle: 24E @ 18 Clicks

Accelerator Pump Bypass: 2 1/4
turns out

Alternate Needles: 22E, 26E

Main Jet: 82

Alternate main Jets: 80, 84

Replacement Cable
Thumb #9339
Twist #9355