[In2deep]

2006 CRF 450R
JD jetting kit.
Red needle, 6th position
180 main
Fuel screw 1 3/4 out.
JUST AS DIRECTED

It took me about 1.5 hours to do breathing slowly and deeply, taking my time to make sure I was doing what I was supposed to.
Manual and JD instructions in hand.

Buttoned it all up and ......... first kick ba ba ba ba ba ba!

Cold this bike has always taken 3-4 kicks.

It seemed to idle nicely. I can't wait to see how things go when I go out to ride!

I will do the O ring install a bit later. The first portion of this went so well I thought I would quit while I was ahead and revisit the rest later.

[xman]

2005 CRF450X

JD kit
Red needle middle
170 main
48 pilot
1 1/4 out f/s
Boyesen AP cover

Stage 2 Hot Cam

Rocket exhaust full system

13/49 gearing

see garage for all other mods

[rstappenbeck]

Here is mine.

-Randall

[KevinM]

And here's mine for my New Jersey based '05 250X

'05 CRF-250X
Location:Sea Level-400'
White Bros E2 Exhaust
JD Jet Kit
JD's Red Needle- 5th pos from top
162 Main
42 Pilot
CRFsOnly Fuel Screw 1-7/8 turns out (2 turns in the winter)
TwinAir PowerFlo Air Filter Kit
Opened Airbox

cut n pasted just in case I change my Sig.

[fatty432]

crf450x 2500'-9500' tested
JD Red Needle 4th pos.
170 Main
45 Pilot {stock}
XR's ONLY Fuel Screw @2.0 avg.
BOYESEN APC {a must}{no adjustments to linkage}


PINK Wire Mod
AIRBOX Mod per Honda Wrench {emulates R box}

NAPALM Filter Screw
ENGINE ICE
UNI Air Filters {backfire screen removed}
APPLIED CC Breather kit
W.B. SMOG BLOCK KIT {10ft. of crap in the trash}
TWO BROTHERS M7 Slipon w/P1 Powertip{quietcore also}
GPR V1
PROTAPER crhi
TRAIL TECH Computer
TRAIL TECH Dashboard
FLATLAND ODO Spacer
ASV F1 Lever Set
WORKS CONNECTION Skid Plate
UNABIKER Radiator Guards
ONE IND. Technoflex Gripper Seat
CRF's Only Graffix
CYCRA PRO BEND Composite Handguards
SPIDER Grips {awesome}
SEAL SAVERS
MAXXIS IT {fr.&rr.}
FASTWAY Case Saver
MOOSE S.S. Footpegs
IMS 3.2 Nat/Wt Fuel Tank w/ Red Billit Cap
MOOSE Fender Tube Pak
MSR Rear Fender Pak
paul

This is a great thread, Paul you are exactly where I need to be. I am going for your config with the jetting. We will see how it turns out, May need some help come monday.

Thanks

[GIGDOG13]

05 CRF450
JD JET KIT
180 MAIN
STOCK PILOT JET
RED NEEDLE 6TH POSITION
QUICK SHOT PUMP COVER MSR FUEL SCREW 1 7/8 TURNS
900 FT
TWIN AIR POWER FLOW KIT
WHITE BROTHERS E2 SLIP ON

[BanditX]

06 CRF250R
700ft elevation
180 main
40slow
fuel screw 1 3/4 out
Boyesen AP cover
Twin-air open system
Needle red 5th clip position
No exhaust mods

JD Jetting set up on the money. I am impressed.

[Trucker]

06 CRF 450x
So. Cal.
WB E2 slip on
Boyesen Quick Shot w/ o-ring
removed smog
case vent
opened up airbox
twin air complete air filter system
170 main
48 pilot
65 leak
red needle 4th clip down fron top
crf fuel screw 1 and 1/8 out
Starts easy with smooth idle
Hits hard w/no bog, plug is a nice shade of tan.
Thanks goes out to JD, CRF's Only and you guys.
You made it easy!

[Skoot22]

The Skoot22 and Bocephus450x $30 450X Jetting kit
All the R&D is done
Honda 16233-men-671 NCVS needle 3rd pos.
170 main
42 pilot
Fuel Screw 2 turns out
Elevation: 1500'-9500'
Airbox opened up
Backfire screen removed
Baffle removed

This is an awesome setup with great throttle response and makes the bike feel very smooth.

[colbar]

its truly amazing that you can jet the bike

[honda_rules_2005]

07 CRF450X

JD jetting Kit
Pro cercuit T-4 exhaust system
Fully opend air box with twin air filter
Pink wire Mode

168 main
45 Pilot
Jd Winter needle in the 2nd pos
air-fuel 1 1/2 turns out.

I have changed the jetting


I now have

170 main
45 pilot
Jd summer needle in the 6th pos from top
air fuel at stock adg

Now its a absolute blast!

[colbar]

:shock:

crf450x 2500'-9500' tested
:D :D JD Red Needle 4th pos.
170 Main {165 for 8000-9500'}
45 Pilot {stock}
XR's ONLY Fuel Screw @2.0 avg.
BOYESEN APC {a must}{no adjustments to linkage}
O-Ring Mod to link :D
PINK Wire Mod
AIRBOX Mod per Honda Wrench {emulates R box}
UNI Air Filters : :) {backfire screen removed} :D :D


paul #1

[honda_rules_2005]

does any one have a JD Jetting kit instructions printout for a 05 CRF450R?

[billk]

Model: 2006 250X

Settings for what altitude: 800 – 1,200 ft
Ambient temperature: 85F – 96F (low humidity)
Main jet size: 155
Needle used: NCYQ (Honda part 16202-MEN-671)
Clip location: 4th (middle).
Airbox mods: 3” square; cut open between three vertical ribs with rubber cover removed
Air Filter changes: Moose

Any other related changes:
Leak jet: 55 (Honda part 99108-MEB-0550)
Pilot jet: 45
Fuel screw: 1/2 out (see note below)
Exhaust: stock with baffle removed
Accel. pump cover changed to Factory R&D
(which included a easy-adjust fuel screw)
No accel. pump linkage modifications
Air pump and emission controls are stock (not blocked)
Pink wire stock
Gearing is stock
Pump gas: Premium

I tried a 42 pilot but had to open the fuel screw 3-1/4
turns. With a 45 pilot, there is no bog and I can richen
the mixture as weather gets colder.

A 158 main jet worked, but the 155 seemed a bit better
under the current weather conditions.
I tried a 162, but it didn't feel as snappy as with the smaller mains.

The engine now lugs very low and has good acceleration
without bogging. There is an occasional backfire on downhill sections.

I replaced the Phillips head screws on the float bowl with Allen head screws. This enables me to remove the bowl to access pilot jet, but it's still an hour-long job.

Another observation: Jetting seemed to make a more noticeable improvement than upgrading the accel. pump cover.

[Skoot22]

Model: 2006 250X

Settings for what altitude: 800 – 1,200 ft
Ambient temperature: 85F – 96F (low humidity)
Main jet size: 155
Needle used: NCYQ (Honda part 16202-MEN-671)
Clip location: 4th (middle).
Airbox mods: 3” square; cut open between three vertical ribs with rubber cover removed
Air Filter changes: Moose

Any other related changes:
Leak jet: 55 (Honda part 99108-MEB-0550)
Pilot jet: 45
Fuel screw: 1/2 out (see note below)
Exhaust: stock with baffle removed
Accel. pump cover changed to Factory R&D
(which included a easy-adjust fuel screw)
No accel. pump linkage modifications
Air pump and emission controls are stock (not blocked)
Pink wire stock
Gearing is stock
Pump gas: Premium

I tried a 42 pilot but had to open the fuel screw 3-1/4
turns. With a 45 pilot, there is no bog and I can richen
the mixture as weather gets colder.

A 158 main jet worked, but the 155 seemed a bit better
under the current weather conditions.
I tried a 162, but it didn't feel as snappy as with the smaller mains.

The engine now lugs very low and has good acceleration
without bogging. There is an occasional backfire on downhill sections.

I replaced the Phillips head screws on the float bowl with Allen head screws. This enables me to remove the bowl to access pilot jet, but it's still an hour-long job.

Another observation: Jetting seemed to make a more noticeable improvement than upgrading the accel. pump cover.

You can get to the pilot and main jet by removing the float bowl drain bolt, i believe it's a 17mm. Loosen the 2 hose clamps on each side of the carb and rotate the bottom toward you. You can get i believe the 6mm nut driver in there to get the main out and the pilot is right next to it. Should be like a 10-15 min job tops.