2006-07 YZ450F User Jetting Database

35 replies to this topic
  • MN_Kevin

Posted December 15, 2005 - 01:09 PM


2006 YZF450 (posted from Burned)

I can sya one thing for sure,the stock yzf jetting will be super lean at sea level.
This bike ended up with a 48 pilot jet a 162 main here at 5500 ft.
It will be able to stand a 158 in the summer.

At sea level you will need a 48 pilot and 170-172 main jet.

  • Reyndogg

Posted December 21, 2005 - 10:55 AM


2006 YZ450F

-Pilot Jet 48
-Main 170
-Needle stock
-2.25 turns out fuel screw
~400 feet elevation

stock pipe, twin air filter w/no toil oil

  • DPW

Posted December 21, 2005 - 11:26 AM


'06 YZ450
-Pilot Jet 48
-Main 170
-Needle stock
-2.00 turns out fuel screw
~400 feet elevation

stock pipe, twin air/stock air filter

  • oldron

Posted January 16, 2006 - 01:16 PM


I have a 2006 YZ450. I had the jetting on a dyno. We could not get it to crisply with the stock needle. We put in a NCYR needle, and with the clip at #2, 160 main, 45 Pilot, Fuel Screw at 1.75 it runs great. I think all you guys that are haviong trouble with th '06 and trying to get with the bigger pilot should look into replacing the needle with the above profile needle.

  • Ga426owner

Posted February 16, 2006 - 05:39 PM


Here is my 06 jetting for Georgia/Alabama.
Winter temps 45-60 degrees w/ medium to low humidity - (45% - 10%)
1.5-2 out Fuel screw

Probably go to a 168mj for the summer - will try Quickshot soon :thumbsup:

  • SurvivorMan

Posted March 02, 2006 - 11:54 AM


06 yz 450
4000-5500 ft
Temp is around 30 (this is throwing things off a little)
160 main
45 pilot
drop the needle one position
fuel screw 1 3/4 turns
Otherwise, everything else is stock...for now.

  • dirtbikindad426

Posted March 21, 2006 - 08:14 AM


Model: 2006 YZ450f
Main Jet: 170
Pilot Jet:48
Starter Jet: stock
Leak: stock
Fuel screw: stock
Needle: stock
Air box: Moose filters
Pipe/muffler: Stock pipe with PMB S/A & silent insert
Altitude: 3000-3400 feet
Temp:current 40-60F
Humidity: ? unkown but I race in the high desert so I am assuming it's low most of the time.

I will add my new fuel screw and do some trials with the pilot jet and post my results

  • SurvivorMan

Posted April 12, 2006 - 03:09 PM


Model: 2006 YZ450f
Edit Revision:19/04/06
Main Jet: 170(stock is 160)
Pilot Jet:48(stock is 42)
Starter Jet: stock
Leak: stock
Fuel screw: scotts t-handle, 2 1/2 turns out
Needle: #5 clip (I richer from stock) stock needle
Air box: stock filter, no toil
Pipe/muffler: Stock header, stock silencer
Altitude: 4000ft-5000ft
Temp:current 10-15 degrees celcius
Humidity: dry 30%

It's the best the bike has ever run. No hesitations, no bog off bottom, started well. I never messed with the jetts or fuel screw during the ride because i was smiling too much!
This setup doesn't make sense to me. I think I should have been leaner than the rest of you with these settings.
I'm just waiting on my smaller leak jet to get a richer ap squirt...that should do it!

  • YZ450FCajun

Posted April 28, 2006 - 07:51 PM


Model: 2006 YZ450f
Main Jet: 165
Pilot Jet:45
Starter Jet: stock
Leak: stock
Fuel screw: Bonez T-handle style 1.25 turns out
Needle: stock
Air box: stock
Pipe/muffler: Stock pipe
Altitude: 3000-3400 feet
Temp:current 40-60F

The bike is running pretty well. It has a lot of power. No pop on decel when riding. When the bike is on the stand, I get the occasional pop on decel and the bike will hesitate when I blip the throttle, but only when the bike has idled for a minute. Otherwise, I can snap it with no hesitation. I figured I would put all this info out there because it might add some clues to whatever is troubling someone else.

  • SurvivorMan

Posted May 15, 2006 - 06:39 PM


Model: 2006 YZ450f
Edit Revision:edited may 15th from April 9
Main Jet: 170...changed back to 165
Pilot Jet:48(stock is 42)...kept it at 48 after trying a 45
Starter Jet: stock
Leak: stock
Fuel screw: scotts t-handle, 2 1/2 turns out
Needle: #5 clip (I richer from stock) stock needle...back to 4th(stock)
Air box: stock filter, no toil
Pipe/muffler: FMF Q2,was terrible, took away from the midrange,back to stock
Altitude: 4000ft-5000ft
Temp:current 10-15 degrees celcius...15-25 celcius
Humidity: dry 30%
Had to go back to almost stock, except for my pilot at 48, it still likes the fat pilot. I tryed the 45 and the bike ran worse(popping and hesitations). I think I will try one more clip leaner on the needle though, the mid range is a little out. I have noticed the bike hates filter skins, especially if they are over oily or dirty. I think the filter and it's condition is playing a huge role in the jetting for this bike, I am going to try a K&N.

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  • Ga426owner

Posted June 19, 2006 - 06:15 AM


on a 06 YZF450 with WB AlumPro 2 pipe. - was using 48pj / 170mj works great up to 80/85 degrees
swapped out to a 165mj for temps at/above 90 and it was flawless - I will try 168 next weekend.

Guess what.....no popping period! :excuseme:

  • grayracer513

Posted June 21, 2006 - 10:55 AM


Model: 2006 YZ450FV
Main Jet: 165 (168 winter)
Pilot Jet: 45 (changed from 42)
Fuel screw: Zyp Ty 1 3/4 turns out (varies w/conditions)
Needle: #4 clip ( stock NFPR)
Air box: Stock, Twin Air filters oiled w/Maxima FFT
Pipe/muffler: DRD Full SS System (no change to jetting when pipe changed from stock)
Altitude: 3500 feet and under
Temp:nominal 60-95F
Humidity: 30-80%

Both '06's using the same settings. Bikes run cleanly. Had an excessive amount of decel backfire when delivered with the 42 pilot, but no more. The engine can be made to stumble off idle on the stand, but it never shows up while riding, and it's a lot better in that regard than with the 42. Starts easy, too, even when dropped.

  • migs647

Posted August 17, 2006 - 11:40 PM


Model: 2006 YZ450f
Main Jet: 168
Pilot Jet:45
Fuel screw: 1 1/2 - 1 3/4 turns out
Needle: Stock Yamaha NFPR at #4 clip
Air box: Uni Filter and White Bros
Pipe/muffler: White Bros Aluminum Pro
Altitude: 300-1500 feet
Temp:current 70-100F

I gotta say... the bike has great response once fired. But for some reason I'm having problems starting it.

Any ideas?

  • aford541

Posted September 10, 2006 - 08:27 PM


Here is where I ended up:

48 Pilot
2.25 out on fuel screw
NFLR needle 4th slot
165 main, thinking I need to go to a 168

I have powernow plus's in front and back of the carburetor
2 stroke 250 filter cage
DMC pipe

  • nedragin460

Posted October 05, 2006 - 06:56 PM


:devil: 06 Yz 450......no popping and WFO fast. Main 162 or 165
depends on ambient temp. needle set at #3 with a 5 thousands shim under it. pilot 45 air screw..... warm the bike up and fine tune it til the dam thing idles smooth and happy. fuel!!!!! mix 1 part (that would be a gallon) 108 or 110 vp to 1 part super unleaded. cheap horse power boyzzz. No screen in the air cage and stock pipe. Popping is cured. Spark plug is light colored with a film of hazy brown. stick to the 165 if you have it still. Remember cold air is go air and hot air is slow air. lol.

  • aford541

Posted October 24, 2006 - 10:27 PM


07 YZ jetting

45 PJ Power nows, Wired Accellerator pump, Disconnected TPS.
NFLR - 4
165 main

  • SaddleBackAgain

Posted November 30, 2006 - 08:07 PM


Thanks I want to say the main is 165 and the I know the pilot is a 45 vs. the 06 42. I haven't checked the needle pos yet.


Stock 2007 jetting is:
160 main
45 pilot
NFLR needle in position 4.

BTW - I"m in Socal riding 1,000 to 4,000 ft mx.
YZ450 is hard to start (compared to crf450) and stalls in slow corners too much.
I'm going to bump the pilot to 48 and go from there.
(love the bike otherwise!)

follow up: the #48 pilot jet helped to ease starting and reduce stalling in corners. Success! May try raising needle and/or going up on main just for fun, but basically feels good now.

  • WB450

Posted May 07, 2007 - 08:56 AM


My 07 YZ450 carb settings.

Model: 2007 YZ450f
Zip Ty Carb Mod
Main Jet: 168
Pilot Jet:48
Starter Jet: stock
Leak: n/a
Fuel screw: Zyp Ty 2 1/2 turns out
Needle: #3 clip ( stock)
Air box: Twin Air
Pipe/muffler: Stock PMB end cap.
Altitude: 2,550 feet
Temp:current 40-90F

  • rtgincnm

Posted June 07, 2007 - 07:10 PM


I have a new '07 YZ450 just past break-in, stock pipe and airfilter
Altitide: 7500 FT
Temp: 50-75F
Main: 158 (stock was 160)
Pilot: 45 stock
Needle: stock

Check the plug after 1 to 2 hours of 2-track and it is very light in the center and dark around the outer rim. Runs great, some backfire on decel, no noticable flat spot.

  • ca412686

Posted June 12, 2007 - 07:39 AM


2006 YZ450 Supermoto

Main Jet: 172
Pilot Jet: 48
Starter Jet: stock
Needle: Stock NFPR
Leak: 45
Air box: K&N Holes drilled in box
Pipe/muffler: Dr D full
Altitude: 400 feet
Temp: 15-25C

The bike has been ported and balanced crank with a high comp piston.

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