Edelbrock Yamaha YFZ450 - Manual (Page 2)

Material will need to be removed on the
outside throttle stop that limits the thumb
lever travel.
Once throttle housing has been properly
modified and thoroughly cleaned, place and
secure back onto handle bar.
3. Thread new throttle cable into housing and
insert cable end into throttle lever.
4. 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 6.
5. 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.
6. 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.
7. 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.
8. Turn fuel petcock to “on” and check for
leaks.
9. Open throttle 3-5 times to prime accelerator
pump. Do not open throttle any more than
5 times as this may flood engine!!
10. Once pump is primed, If Motor will not fire
open idle cable 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 #3177 and #3178 YFZ450
Carburetor Specifications
Bore Size: 40mm
Needle: K-6 @ 12 Clicks
Accelerator Pump Bypass: 1 3/4 turns out
Alternate Needles: K-5, K-7
Replacement Cable
Thumb
#9339
Twist #9355