Jetting D-Base for CRF250R


17 replies to this topic
  • RallyImprezive

Posted November 24, 2008 - 07:51 AM

#1

A thread like this exists over in the YZ/WR 250F forum, and I thought it would be nice to have one here. Here is the template:

Model Year:
Main jet:
Pilot Jet:
Leak Jet:
Fuel screw (turns out):
Needle model/Clip position:
Airbox mods:
Pipe:
Altitude where you ride:
Temperature where you ride:
Other mods:
Degree of satisfaction:

Try not to fill the thread with other topics. Jetting questions should probably be directed to the Jetting forum. This will help make jetting searches more productive. So go ahead and post your specs!!
Mod: Sticky?

  • RallyImprezive

Posted November 24, 2008 - 07:55 AM

#2

Model Year: 2008
Main jet: 178
Pilot Jet: 48
Leak Jet: Stock
Fuel screw (turns out): 2 Turns
Needle model/Clip position: stock needle, 3rd position
Airbox mods: None
Pipe: Stock
Altitude where you ride: 6000'
Temperature where you ride: 50-60F
Other mods: None
Degree of satisfaction: Bike starts far more easy than stock. But there is some bog with the first 1/4 throttle turn. Pulls very hard and strong above 1/4 turn on the throttle.

  • nzmech

Posted November 24, 2008 - 11:39 AM

#3

09,jd jet kit 190 main red needle 5th clip,42 pilot,55 leak,1 3/4 turns out, 8thou ex,4thou in,no other mods,20-30 deg C, 0-2000 feet, Runs & pulls clean, no starting probs A++ NO bog whatsoeva!

  • moto-101

Posted December 10, 2008 - 04:45 PM

#4

What to do with my 08 crf250r i just instaled a merge racing leak jet and a jd jetting kit i have way to much bog on the bottom end, im using the red needle the clip is on the 4th position and a 190 main and im riding at sea level in vancouver canada, all the other jets are stock

  • seth240

Posted December 10, 2008 - 04:57 PM

#5

Model Year:2007
Main jet:172
Pilot Jet:42
Leak Jet:45
Fuel screw (turns out):2 1/4
Needle model/Clip position:3rd
Airbox mods:none
Pipe:stock
Altitude where you ride:0-1000
Temperature where you ride:50-70
Other mods:removed baffle plate in float bowl, turned ap timing screw 2 1/2 turns in
Degree of satisfaction:Very high :thumbsup: no bog at all!

  • shlambd

Posted December 10, 2008 - 11:49 PM

#6

What to do with my 08 crf250r i just instaled a merge racing leak jet and a jd jetting kit i have way to much bog on the bottom end, im using the red needle the clip is on the 4th position and a 190 main and im riding at sea level in vancouver canada, all the other jets are stock


did you not read what the first post said?

  • moto-101

Posted December 11, 2008 - 08:49 AM

#7

sorry im new at this yes i did read the first add thanks!

  • 22wdad

Posted November 10, 2009 - 02:12 PM

#8

Model Year: 2008
Main jet: 168 winter, 162 summer
Pilot Jet: 40
Leak Jet: 40
Fuel screw (turns out): 1.5 to 2.25 Turns
Needle model/Clip position: stock needle, 3rd position
Airbox mods: None
Pipe: Stock
Altitude where you ride: 4,000+ ft.
Temperature where you ride: 35-105F
Other mods: None
Degree of satisfaction: Starts good hot or cold and pulls hard, but I'm still looking for the right needle...

  • chayes627

Posted November 10, 2009 - 03:35 PM

#9

Model Year:2007
Main jet:175
Pilot Jet:42
Leak Jet:65
Fuel screw (turns out):2 1/4
Needle model/Clip position:3rd
Airbox mods:none
Pipe:stock
Altitude where you ride:0-2000
Temperature where you ride:50-80
Other mods:Boyeseen QS2
Degree of satisfaction:no bog at all

  • dirtracker

Posted February 03, 2010 - 01:41 PM

#10

Model Year: 2006 CRF250R

Main jet:[ 172 stock] 170
Pilot Jet:[40 stock] 45
Leak Jet:[55 stock] 50
Fuel screw (turns out):[1-3/4 stock] 1-1/2
Needle model/Clip position:[NHFS 3rd clip] stock
Carb mods: float bowl baffle remove,Merge racing AP spring
Airbox mods:stock w/ twin air filter
Fuel: pump gas
Pipe:White brothers dual aluminum
Altitude where you ride:0-1000
Temperature where you ride: 50-80 F
Other mods: Hotcam stage 2

No bog whatsoever very crisp sharp throttle response pulls clean from bottom to top.Starts 1st or 2nd kick most of the time.

Edited by dirtracker, February 07, 2010 - 07:10 PM.


  • Charlie C

Posted February 03, 2010 - 02:32 PM

#11

What to do with my 08 crf250r i just instaled a merge racing leak jet and a jd jetting kit i have way to much bog on the bottom end, im using the red needle the clip is on the 4th position and a 190 main and im riding at sea level in vancouver canada, all the other jets are stock


What size pilot is in it to start with? I can't remember which adjustable leak jet says to remove the leak jet completely. It might be the merge. I don't know much about the JD jetting kit, but the 190 is really rich. I can get them to run real strong without the JD jetting kit and just playing with the stock set up with the addition of the adjustable leak jet. How far in do you have the screw turned in on the adj leak jet? I know on my kids 08, it's almost all the way in. His has the R&D adjustable leak jet with a 42 pilot and a 172 main. Needle in the 3rd position and who knows how far the mixture screw is out. It runs hard!
Also, is there any other work done to it like head porting?

  • homernukem

Posted February 06, 2012 - 04:05 AM

#12

Here's a site that has stock crf250's and crf250x's it shows stock jetting and has several jetting charts.
http://rickramsey.net/CRF250X.htm

  • BassMan

Posted February 20, 2012 - 06:08 AM

#13

Model Year: 2008
Main jet: 172
Pilot Jet: 45
Leak Jet: 40
Fuel screw (turns out): 1 Turn winter 1/2 turn summer
Needle model/Clip position: stock needle, 3rd position
Airbox mods: None
Pipe: FMF Q
Altitude where you ride: 600'
Temperature where you ride: 30-100+F
Other mods: Rekluse EXP 2.0
Degree of satisfaction: easy starts cold or hot, runs great

  • slidin

Posted February 20, 2012 - 06:23 AM

#14

Model Year:2007
Main jet:172
Pilot Jet:42
Leak Jet:45
Fuel screw (turns out):2 1/4
Needle model/Clip position:3rd
Airbox mods:none
Pipe:stock
Altitude where you ride:0-1000
Temperature where you ride:50-70
Other mods:removed baffle plate in float bowl, turned ap timing screw 2 1/2 turns in
Degree of satisfaction:Very high :bonk: no bog at all!



Same, same. No bog/exact setting

  • Keith72

Posted February 20, 2012 - 04:07 PM

#15

Model Year: 2009
Main jet: 172 winter, 168 summer

Pilot Jet: 42 winter, 38 summer
Leak Jet: 70
Fuel screw (turns out): 2.25
Needle model/Clip position: NLCT / 3rd from top
Airbox mods: None backfire screen not removed
Pipe: FMF 4.1 with megabomb
Altitude where you ride: 1000' approx
Temperature where you ride: 35-105 degrees
Other mods: ported head, 37mm carb bored to 38.5
Degree of satisfaction: starts and runs great no bogs

  • Goforaride

Posted March 17, 2014 - 12:04 AM

#16

Bump

  • tomjv

Posted May 30, 2014 - 02:24 PM

#17

2006 CRF250r

176 main

45 pilot

NKBT needle on 3rd clip from bottom (of 5)

100-2500', 60-90 deg F

Mostly stock.  Bike runs fine.

 

TomJV


Edited by tomjv, May 31, 2014 - 09:56 AM.


  • tonyiaco290

Posted May 30, 2014 - 06:29 PM

#18

Model Year: 2005
Main jeticon1.png: 172
Pilot Jet: 45
Leak Jet: stock
Fuel screw (turns out): 2

Needle model/Clip position: stock/3rd
Airbox mods: No Toil filter cage
Pipe: stock
Altitude where you ride: 800-3500
Temperature where you ride: 60-85
Other mods: 2008 higher comp piston
Degreeicon1.png of satisfaction: Very Good







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