I have a 2005 CRF250R. WhiteBrothers Pro I. Boyesen AP. 155 main jet. Needle on 6 slot. Air screw is 2 turns out. Bike feels flat. Feels good mid and high but low is a little rough. any suggestions. Also thinkin about going to a 110 in the back. Good or Bad?
Jetting Settings
Started by
Hawaii-Rider
, Aug 14 2004 01:42 PM
193 replies to this topic
Posted 19 June 2005 - 09:51 AM
I couldn't take it anymore...the off-idle bog of my 250X was maddening. After reading wheelsoff's post I figured "what the heck". I went with the some of the same carb mods: 130 to 150 main jet, 40 to 45 slow jet, and dropped the needle clip 2 slots. Didn't mess with the leak jet. But anyway, talk about a huge difference!! It's like riding a completely different bike! Crack the throttle and BAM, the power is there!
Posted 30 July 2005 - 02:28 PM
'05 250X with a FMF Powerbomb header and Q muffler.
160 main, 45 pilot, stock needle at #4, FS 2 turns.
Riding at 500' ASL, temps 80-100.
The bike runs great with no bog.
160 main, 45 pilot, stock needle at #4, FS 2 turns.
Riding at 500' ASL, temps 80-100.
The bike runs great with no bog.
Posted 30 July 2005 - 07:06 PM
I just finished re-jetting my 250X today. Huge gains in power and throttle response. No bog either! Changes were as follows: 150 main, 42 pilot, stock 55 leak jet, lowered needle clip two positions form stock. Fuel adj. screw is two turns out. Airbox is slightly opened up on top to a 3" x 3+1/2" opening(not near as much as the CCC mod) and the baffle has the Rick Ramsey modification done to it. Elevation here is 900 ft. and the temps in the low 90s. Best $14 I've ever spent.
Posted 30 July 2005 - 07:10 PM
CRF230Rider said:
I just finished re-jetting my 250X today. Huge gains in power and throttle response. No bog either! Changes were as follows: 150 main, 42 pilot, stock 55 leak jet, lowered needle clip two positions form stock. Fuel adj. screw is two turns out. Airbox is slightly opened up on top to a 3" x 3+1/2" opening(not near as much as the CCC mod) and the baffle has the Rick Ramsey modification done to it. Elevation here is 900 ft. and the temps in the low 90s. Best $14 I've ever spent.
Posted 01 August 2005 - 05:57 AM
Does anyone know what kind of jetting I would need for my Pro Circuit Ti-4 SL at 0-1000 ft altitude?
Posted 11 August 2005 - 08:49 AM
Who can help me out.... what jetting would you lot recomend for my CRF250R in the UK, probably a little over sea level if any at all.I have heard so many different options. Got stock pipe and will remove screen from air filter.
Posted 19 August 2005 - 01:07 PM
NE corner USA
06 CRX 250 X
Airbox Mod 4.5x4
Leak Jet: 70
Pilot: 42
Main jet: 160
JD Kit, red needle, 5th clip from top
Koobalink extended fuel screw: 2 turns out
PowerNow intake
The machine runs very strong and no bogging
Phil
06 CRX 250 X
Airbox Mod 4.5x4
Leak Jet: 70
Pilot: 42
Main jet: 160
JD Kit, red needle, 5th clip from top
Koobalink extended fuel screw: 2 turns out
PowerNow intake
The machine runs very strong and no bogging
Phil
Posted 06 September 2005 - 01:53 PM
Sea Level 250-04' X. 135 Main, 142 P, Needle stk. 2 notch from top of needle.
100 mile dual sport, 45 mpg. plug perfect tan, don't use the hot starter lever, never missed a beat. Drop, pick up and start right now. Crisp and no hesitation anywhere through the range.
100 mile dual sport, 45 mpg. plug perfect tan, don't use the hot starter lever, never missed a beat. Drop, pick up and start right now. Crisp and no hesitation anywhere through the range.
Posted 02 October 2005 - 05:42 AM
I suppose I ought to post my jetting as it seems to be working well. Thanks to Ramsey for all the reference materials .
'05 49-state 250X
Full CCC mods
5,300 ft elevation riding
40 - 100 degree temps
Slow Jet: 42
Needle: NCYS (CCC needle), 2nd clip (I might drop to 3rd when cold)
Main Jet: 145 when hot outside, 148 when cold
Fuel screw: 1-1/2 - 2 turns out, whatever runs best
Leak jet: 70
.'05 49-state 250X
Full CCC mods
5,300 ft elevation riding
40 - 100 degree temps
Slow Jet: 42
Needle: NCYS (CCC needle), 2nd clip (I might drop to 3rd when cold)
Main Jet: 145 when hot outside, 148 when cold
Fuel screw: 1-1/2 - 2 turns out, whatever runs best
Leak jet: 70
Posted 12 October 2005 - 09:48 PM
I have a 160 main and the stock crf250r silencer. good? bad? carb changes? I'm gonna take off the airbox snorkel too.
Posted 16 October 2005 - 05:16 PM
Clarksville, Ar 250x W/r Pipe&header, Air Box Cut, No Tiol Airfilter
400ft To 1000
Main Jet130 Stock To A 170
Pilot 40 Stock To A 42
Leak Jet 55 Stock
Needle Clip Down To The Four Slot 2 More Than Stock
A/c Pump Adjustment Screw One Full Turn
Fuel Screw Or Pilot Adjustment 2 1/4 Turn
No Bogg Great Power
400ft To 1000
Main Jet130 Stock To A 170
Pilot 40 Stock To A 42
Leak Jet 55 Stock
Needle Clip Down To The Four Slot 2 More Than Stock
A/c Pump Adjustment Screw One Full Turn
Fuel Screw Or Pilot Adjustment 2 1/4 Turn
No Bogg Great Power
