Jetting Settings


196 replies to this topic
  • Hawaii-Rider

Posted August 14, 2004 - 01:42 PM

#1

Folks:
Will have this sticky up top so you can add Jetting settings you have for your R or X.
Please keep it to that, no off-side discussions. Want to keep this post for jetting info for folks so they dont have to dig through a bunch of discussion to get to what is working for us and where/how we ride.!
:thumbsup:
Thanx!

CRF-250X
Sea-level to about 2000'
Western Washington tight single track
Temps so far= 50 to mid 90s
Mods:
Air box lid cut to honda recommended line
Pink wire cut
JD Jetting kit
Red needle, 3d clip from the top
150 main
42 Pilot
2 full turns on the fuel screw.
PowerNow in carb
Backfire screen still in
Twin air and stock filter with No-Toil filter oil from
http://Shop.thumpertalk.com
Totally Stock Exhaust
Pump gas (92 octane) fresh each ride.

Very happy.....front end comes up with a twist even with my fat butt on it.
Bike loves to run lean I have found out.

  • money_pit

Posted August 19, 2004 - 03:30 PM

#2

Where?

  • redrider650r

Posted August 19, 2004 - 04:00 PM

#3

CRF250X - CA model
- Elevation from 0 ft. to over 9000 ft.
- NCYR needle in the 4th clip position
- 160 main
- 42 pilot
- Air box lid cut to honda recommended line
- Pink wire relocated to lower receptical
- Stock air filter
- Applied smog block-off kit
- Dr. D Exhaust
- Fuel screw is set for the stock CRF250R model(2 turns?)

  • Vic_250x

Posted August 19, 2004 - 06:21 PM

#4

what does cutting the pink wire do for u -- and would you want to possibly set it to be able to toggle off and on for different terrains or reasons?

  • cal44

Posted August 22, 2004 - 05:15 PM

#5

CRF250x;CAL bike
Stock air filter
Airbox;opened area where rubber baffle was
NCVT needle,3rd
148main
2.0 turns
Exhaust;removed baffle,cut off tube.
Reinstalled mini muffler,sounds good
Removed air injection
1000-4500 ft.,90's temp.
Runs great :thumbsup:

  • Throttlejockey

Posted August 23, 2004 - 05:38 AM

#6

How about some R settings?

  • money_pit

Posted August 24, 2004 - 11:53 AM

#7

How about any settings. What's it a secret?

  • 250Xrider

Posted August 25, 2004 - 07:04 AM

#8

I'm getting ready to tear apart my new CRF250x.....before I buy a bunch of parts I don't need, here's a question...

...what size main jets does JD include in the jetting kit for the X? I know I'll have to pick up a #42 pilot and an alternate size leak jet from Honda. I'd probably pick up at the same time a main jet or two not included by JD.

Thanks!

  • wheelsoff

Posted August 25, 2004 - 11:38 AM

#9

I finally set aside some time to dig into the jetting on the wife's X since it had been exhibiting signs of being quite lean. Here's what I went with:

150 main
stock needle, dropped clip two slots
45 pilot
55 leak jet
fuel screw two out
motor/exhaust other than jetting changes is bone stock

Took it for a short zip up the street. WOW!!!! Major difference from stock jetting. Absolutely 100% ZERO bog! Slow to an absolute crawl, crank the throttle all the way open immediately and up comes the front end. NICE! Bike had a terrible bog/hesitation before but sure doesn't now. I can't believe and am frankly rather annoyed at the fact that these things come so unbelievably lean from the factory. I've seen bikes one or maybe two steps off on the main but a 130 to a 150?? :thumbsup:

Temps are low 90s, humidity in the 50s, elevation near 1000.

  • Hawaii-Rider

Posted August 25, 2004 - 05:06 PM

#10

I'm getting ready to tear apart my new CRF250x.....before I buy a bunch of parts I don't need, here's a question...

...what size main jets does JD include in the jetting kit for the X? I know I'll have to pick up a #42 pilot and an alternate size leak jet from Honda. I'd probably pick up at the same time a main jet or two not included by JD.

Thanks!


JD kit has two needles, one needle clip and 5 main jets
150
155
158
160
165

HR
:thumbsup:
:devil:

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • zmr

Posted August 26, 2004 - 12:55 PM

#11

Here is our '04 250X (49 State) Settings...

Single Track riding only
Pink Wire Stk
Mostly ride 1,000 - 3,500 ft. - Runs GREAT here!
Ocasionally ride 5,000 - 6,000 - Still runs pretty good
added 13oz. TrailTech Flywheel
PowerNow (intake side only)
using Stk Air Filter w/backfire screen
Premium Pump Gas
Modest airbox opening (have not done full CCC mod)
Drilled an extra couple of smallish holes in the Stk
Exhaust insert-still nice and Quiet-does not seem
any louder than stk pipe w/insert

* 40 PJ (42 was too rich)
* 150 MJ (started w/158-but too rich-especially over 5,000ft
* 4th Clip Pos. on JD's Red Needle

  • smoker

Posted September 01, 2004 - 04:33 PM

#12

CRF-250X
Sea-level to about 2500'
Ridden: NJ, NY, CT, MA and NH
Temps so far= 50 to mid 90s
Mods:
Air box lid cut to honda recommended line
Pink wire mod
JD Jetting kit
Red needle, 5th clip pos. from top
165 main
40 Pilot(stock)
2 full turns on the fuel screw.
Backfire screen removed
Twin air Back fire installed w/ No-Toil filter oil
Totally Stock Exhaust
Pump gas (92 octane)
Plug color: tan
Riding: 90% single track, very technical to preschool.
Riding style: always on the gas!! :thumbsup:

  • FGR01

Posted September 05, 2004 - 11:30 PM

#13

I have seen some people asking how to obtain the size 55 Leak Jet (70 is stock). 55 is stock for the 450 and is available through Honda as part # 99108-MEB-0550.

Does anyone know a good source to obtain other sizes, say 65, 60, etc? Actually they probably go in steps of 2 or 3 since they're Keihin.

  • Geno1

Posted September 06, 2004 - 11:52 AM

#14

So Cal riding. Applied block off. Stock exhaust, air filter with screen. Snorkel cut. 14-50 gearing. 140 mj, 42 pilot, air screw 2 1/2 and needle second position from bottom. Just got back from Colo, 9000-13000' 130 mj and clip in mid position. Ran clean but definitly less power.

  • Red_250X

Posted September 08, 2004 - 08:43 PM

#15

You're probably a little rich if the baffle is still in. At the same altitude in CO, I ran a 130 main and 42 pilot with the baffle out and the mods listed below. I could hardly tell a difference in power. Out of the 25 bikes in our group, the only ones that could outrun me were an XR650 and a WR450F. I climbed some hellacious hills...the only problem I had was just hangin' on!!

  • Dingus

Posted September 10, 2004 - 09:04 PM

#16

Hey everybody, I'm a carb novice and I'm trying to find a good tutorial geared specifically for motorcycle carbs (even more specifically, the carb on my X!). Does anyone know of any good "carbs for idiots" resources? I bought the service manual but it understandably assumes basic knowledge...that I don't have.... Thanks.

  • 4strokemadman

Posted September 11, 2004 - 01:42 PM

#17

Ride in NH, MA, CT, PA
0-1,000 FT Elevation
Airbox Modded
Exhaust Baffle removed (left in spark arrester)
Stock Air Filter with screen (No Toil Oil)
Pump Gas
150 Main
42 Pilot
Stock Needle in the 4th Position
Riding: Technical Single track to Dirt roads
The above mods made a huge difference.

  • Red_250X

Posted September 14, 2004 - 09:45 AM

#18

Here's a great site for jetting information. It references the Yamaha high end four strokes, but it's the same carb as we have on the CRF250's (and probably CRF450).

http://www.thumperfaq.com/jetting.htm

  • mikerides33

Posted September 16, 2004 - 12:16 PM

#19

I called up PRO CIRCUIT today and they told me for a stock 2005 R use the following:
MAIN: 162
PILOT: 42
NEEDLE: NCYR 3rd from top
FUEL SCREW: 2 turns out
LEAK JET: 55
What does everybody think about this?

  • FGR01

Posted September 16, 2004 - 02:10 PM

#20

I called up PRO CIRCUIT today and they told me for a stock 2005 R use the following:
MAIN: 162
PILOT: 42
NEEDLE: NCYR 3rd from top
FUEL SCREW: 2 turns out
LEAK JET: 55
What does everybody think about this?


That main and needle sounds very lean. That is the factory recommended settings to use with the optional 94dB muffler that came with my bike.





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