Jetting Settings

[Hawaii-Rider]

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.!

?

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]

Where?

[redrider650r]

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]

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]

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 ?

[Throttlejockey]

How about some R settings?

[money_pit]

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

[250Xrider]

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]

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?? ?

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

[Hawaii-Rider]

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

?

[zmr]

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]

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!! ?

[FGR01]

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]

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]

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]

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]

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]

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]

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]

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.