Honda CRF250X

January 20, 2010 version


 My Modifications 







Honda released the 2004 CRF250X in February, 2004.

On this page, I've collected information from many sources that will help you set up and modify your CRF250X. Some of the information is opinion, mine or someone else's. Pictures and factual information (measurements, documents, etc) have been provided by:
DwightC of Albuquerque, NM
Tom Myers of CycoActive
Motorsports Network
and others as noted.

Photo courtesy of Motorsports Network

Many numbers shown in tables and text are from the Honda 250X and 250R Owner's Manuals and Service Manuals and not from Honda web pages; exceptions are noted. Honda's web site is sometimes inaccurate on weights, compression ratios, rake, trail, and other numbers. These are all numbers that are not finalized until the first bike rolls off the assembly line.

I have updated the information to 2008 specs.

If you find any errors or would like to suggest changes, please let me know. My e-ddress is on my home page.

You should buy the Honda Service Manual and use it as the first authority on modifications. If anything you read or hear conflicts with the manual, go with the manual, unless you're absolutely sure you know otherwise.

Click on small pictures to supersize.   Click on underlined words to go to that section on this or another page.

Changes from 250X pre-release information
Differences between the 250X and 250R 
Miscellaneous Information 
Drive Chain 
Fuel Tank 
Closed Course Competition Modifications (CCC Mods)
Pink Wire 
Some Prices 
Why did I get a 250X 
Pictures and other info 

Changes from 250X pre-release information

I ordered the Honda 2004 CRF250X Owner's Manual from Helm, Inc for about $21, including shipping on 1/7/04.

The 250X Owner's Manual showed changes from Honda's web site and other pre-release information. The compression ratio is now 12.9 : 1, the same as the '04-'07 250R. Sprocket sizes are now 14/53 instead of 13/49 as previously published. The seat height is reduced to 37.7" and ground clearance to 13.6", which are the same as the 250R. The dry weight is up to 236 pounds. Ouch!

I ordered the Honda 2004 CRF250X Service Manual from Helm, Inc on 2/4/04. The price was $48; shipping and handling extra.


Differences between the 250X and 250R (based on Honda Service Manuals)
Additional information for selected parts and assemblies for all X and R model years is on the Comparo page.
Information on the '06 X and R heads is on the Big Bore page, topic 2006 head: '06 X 49-state vs '06 R.   ('07 R head info is included, also)
Complete specifications for the CRF250X are shown at the bottom of this page.

Black text is for 49-state models; blue text is for CA models.
When no year is shown, the information applies to all years - '04, '05, '06, '07, and '08.

Engine / transmission 250X   * California model 250R

Intake opens at 1mm lift - 10º BTDC
Intake closes at 1mm lift - 40º ABDC
Intake lobe height 35.580-35.660 (1.4008-1.4039)
Exhaust opens at 1mm lift - 40º BBDC
Exhaust closes at 1mm lift - 10º ATDC
Exhaust lobe height 25.081-25.161 (0.9874-0.9906)

Intake opens at 1mm lift - 0º BTDC *
Intake closes at 1mm lift - 45º ABDC
Intake lobe height 35.280-35.360 (1.3890-1.3921)
Exhaust opens at 1mm lift - 45º BBDC
Exhaust closes at 1mm lift - 0º ATDC
Exhaust lobe height 24.959-25.038 (0.9826-0.9857)

Intake opens at 1mm lift - 15º BTDC - '04-'07
Intake opens at 1mm lift - 20º BTDC - '08
Intake closes at 1mm lift - 50º ABDC
Exhaust opens at 1mm lift - 50º BBDC
Exhaust closes at 1mm lift - 20º ATDC - '04 and '08
Exhaust closes at 1mm lift - 15º ATDC - '05-'07

Intake lobe height
36.000-36.240 (1.4173-1.4268) - '04-'06
36.200-36.440 (1.4252-1.4346) - '07
36.280-36.360 (1.4283-1.4315) - '08
Exhaust lobe height
25.667-25.907 (1.0105-1.0120) - '04 and '06
25.501-25.741 (1.0040-1.0134) - '05
25.501-25.721 (1.0040-1.0126) - '07
25.750-25.830 (1.0138-1.0169) - '08

Ignition Control Module (CDI) aka ECU Uses throttle position sensor on carb to adjust ignition map Uses throttle position sensor on carb to adjust ignition map
Spark plug and gap NGK IMR8C-9H  .8-.9mm gap NGK IMR8C-9H  .8-.9mm gap - '04
NGK R0409 B-8  .6-.7mm gap - after '04
Transmission Wide ratio, 5-speed, primary reduction 3.611 (65/18) Close ratio, 5-speed, primary reduction 3.167 (57/18)
1st thru 5th ratios 2.385  1.750  1.333  1.042  0.815 2.143  1.750  1.450  1.227  1.042
1st thru 5th internal gears 31/13  28/16  28/21  25/24  22/27 30/14  28/16  29/20  27/22  25/24
Transmission oil capacity 670cc after draining
750cc after disassembly
720cc after draining - '04
600cc after draining - after '04
770cc after disassembly - '04
700cc after disassembly - after '04
Clutch plates Judder spring and spring seat, one large i.d. fiber disk, and 7 pairs of metal and fiber plates 7 metal plates and 8 fiber plates - '04-'07
Judder spring and spring seat, one large i.d. fiber disk, and 7 pairs of metal and fiber plates - '08
Clutch spring free length 38.8mm 37.1mm - '04
38.0mm - '05-'07
38.5mm - '08
Clutch spring service limit 38.0mm 36.3mm - '04
37.2mm - '05-'07
37.7mm - '08
Sprockets 14/53 (3.786) 13/51 (3.923)
Engine dry weight 58.6 lbs - '04-'06
59.3 - after '06;  extras include heavier flywheel, electric starter motor, extra gears for electric starter, and electric starter clutch
52.68 lbs - '04, '05
53.02 lbs - '06
53.09 lbs - '07
53.13 lbs - '08
Engine oil capacity
(no difference; included for completeness)
660cc after draining
690cc after draining and oil filter change
850cc after disassembly
Engine oil jet (ServMan p. 4-6) oil jet only - '04, '05
oil jet and bolt - after '05
oil jet only - '04
oil jet and bolt - after '04
Engine service interval Racing - same as 250R
Non-racing - 600 miles (transmission oil, engine oil and filter)
Every 6 races or about 15 hours

Carburetor / air box 250X   * California model 250R
Carburetor 37mm FCR02A and FCR03A* - '04, '05, '06
37mm FCR02B and FCR03B* - '07
37mm FCR02C and FCR03C* - '08
37mm FCR01A.A - '04
37mm FCR01B.A - '05
40mm FCR01C.A - '06
40mm FCR01D.A - '07
40mm FCR01E.A - '08
Jetting NCVT #3, 130 mj, 40 pj, 55 leak, 2 1/4 fs - '04, '05, '06
NLAT #1, 130 mj, 42 pj, 60 leak, 2 1/4 fs - '07
NLAT #1, 130 mj, 42 pj, 60 leak, 1 3/4 fs - '08
NCYU #2, 130 mj, 40 pj, 65 leak, 2 fs - '04, '05, '06*
NLBU #2, 132 mj, 42 pj, 55 leak, 2 1/4 fs - '07*
NLBU #2, 132 mj, 42 pj, 55 leak, 2 fs - '08*
NCYS #4, 152 mj, 40 pj, 70 leak, 2 3/4 fs - '04, '05, '06   CCC mods

100 slow air jet (changeable) - '04-'07 49-state and CA
Slow air jet is press-fitted - '08 49-state and CA
NCYR #4, 160 mj, 40 pj, 70 leak, 2 1/4 fs - '04
NCYQ #3, 172 mj, 42 pj, 70 leak, 1 3/4 fs - '05
NHFS #3, 172 mj, 40 pj, 55 leak, 1 3/4 fs - '06
NKBT #3, 175 mj, 42 pj, 70 leak, 2 1/4 fs - '07
NMGU #3, 188 mj, 42 pj, 70 leak, 1 7/8 fs - '08

100 slow air jet (changeable) - '04-'07
Slow air jet is press-fitted - '08
Carburetor maintenance tool Maybe; if not, order the 250R tool Yes, allows on-bike needle replacement
Carburetor adjustment info Minimal, see 250R owner's manual and my Jetting page Six pages, includes jetting charts
Air box One-piece box with a side door for air filter access and a top shelf for the battery. There is an air snorkel in the top, held in place with two pop rivets. Formed by several component pieces; the air cleaner housing which is a box with an open top and back and partial sides, a rear fender panel, and part of the side number panels.

Suspension / frame 250X 250R
Fork springs .40, .42, .44 kgf/mm available;
.42 - '04-'08
.43, .44, .45, 46 .47, 48 kgf/mm available;
.45 - '04-'07
.46 - '08
Fork spring free length 495mm - '04, '05
500mm - after '05
495mm - '04-'07
494mm - '08
Fork height Top of the fork tube aligned with the top of the upper fork clamp; the owner's manual states that this is not adjustable, but clearly it is adjustable. Maybe they mean you "should not" adjust it. But see how the 250R is lower. For 21" front wheel - groove in fork tube aligned with the top of the upper fork clamp (fork sticks up 7mm)
For optional 20" front wheel - top of the fork tube aligned with the top of the upper fork clamp (like the 250X)
Fork fluid capacity (fork tube) 345cc (11.7 oz) - '04, '05, '08
340cc (11.5 oz) - '06
348cc (11.8 oz) - '07
379cc (12.8 oz) - '04
371cc (12.5 oz) - '05
369cc (12.5 oz) - '06
372cc (12.6 oz) - '07
408cc (13.8 oz) - '08
Rake 27º 56' - '04, '05
27º 54' - after '05
27º 44'' - '04
27º 50' - after '04
Trail 116mm (4.6 inches) 112mm (4.4 inches) - '04
123mm (4.8 inches) - '05-'07
125mm (4.8 inches) - '08
Shock spring 4.55, 4.80, 5.00, 5.20 kgf/mm; stock is 4.80 5.10, 5.30, 5.50, 5.70 kgf/mm; stock is 5.30
Shock spring installed length 254.4mm - '04, '05
256.6mm - after '05
260.1mm - '04
261.3mm - '05
259.0mm - '06-'07
259.6mm - '08
Wheelbase 58.4 inches 58.2 inches - '04-'07
58.1 inches - '08

Other 250X 250R
Gas tank 2.5 gal (includes .4 gal reserve) '04-'07
2.35 gal (includes .42 gal reserve) '08
1.93 gal
Rear wheel 18" 19"
Coolant capacity 1.13 liter (1.19 qt) at change
1.20 liter (1.27 qt) at disassembly
0.93 liter (0.98 qt) at change
1.00 liter (1.06 qt) at disassembly
Radiator fan Optional (bonus!); see below No
Coolant overflow bottle Yes No (possibly fit the 250X bottle)
Alternator 64.4 W / 5,000 rpm Not rated; used for ignition only
Lights Front 12 V 35 W (3 wires in the socket, only 2 used ), tail LED No
Starter Electric and kick Kick
Spark arrester Removable screen type, clean periodically No
Muffler packing No, uses internal metal baffles Yes, glass wool
Exhaust diffuser, aka exhaust baffle Diffuser pipe in the muffler canister, held in with one torx bolt; see the Closed Course Competition Modifications section. No
Exhaust header pipe Longer than the 250R, about 3", for more torque Short, for more top-end
Side stand Yes, bolts to frame No
Water pump guard, plastic wing Yes No
Odometer Yes, analog No
Chain T-ring Standard, non o-ring
Weight, claimed 236 lbs 206 lbs
Non-engine service interval Racing - same as 250R
Non-racing - 600 miles
Every 2.5 hours



Miscellaneous Information

Previously ('04-'06), the California model 250X had a secondary air injection system, which introduces filtered air into the exhaust gases in the exhaust port. There are extra hoses and an air pump under the fuel tank.

This system is on ALL USA 250X models beginning with the 2007 model year.

Photo courtesy of DRZINK on ThumperTalk

Clutch baskets: The part numbers for the 250R and 250X clutch baskets are different and some other clutch components are different. Aftermarket clutch kits may or may not interchange.

Fork shim stack: In response to questions about the fork shim stack, neither the 250R nor the 250X Service Manuals show any details or parts breakdown of the shim stack.

Electric start: A look at the electrical wiring diagram in the 250X Service Manual shows that there is no key and no on/off switch, but there is a normal kill button. And there is an electric start button. The clutch lever must be pulled in for the electric start button to function. There is no neutral-sensing switch in the transmission. The bike will start in or out of gear, but the clutch lever must be pulled in for electric starting, always. The kill button is on the left side of the handlebar where it normally resides; the electric start button is on the right side of the handlebar.

Battery charging: The 250X Service Manual chapter on Battery/Charging System notes "The battery will self-discharge when the motorcycle is not in use. For this reason, charge the battery every 2 weeks to prevent sulfation from occurring." I added a pigtail with a covered connector to the battery terminals to facilitate trickle charging with my Yuasa charger.

Handlebar position: The handlebar position on both the 250R and 250X models may be moved forward 6mm from the standard position. Page 12-32 in the 250R Service Manual and page 13-32 in the 250X Service Manual describe the adjustment. Remove the top handlebar clamps and handlebars, then remove the lower clamps. Rotate the lower clamps 180º and reinstall everything. There are optional lower clamps that move the handlebars only 3mm forward of the standard position.

Important information about trimming your handlebars at CycoActive Trail Tips.

Supplied with bike: 2004 CRF250X Set-up Instructions booklet, page 2, step 3:
"Keep the Owner's Manual, the 'Tips & Practice Guide for the Off-Highway Motorcyclist' booklet, spoke wrench, carburetor maintenance tool, and the spark plug wrench separate and hand-deliver to the customer at the time of delivery."

busyOptional Cooling Fan
Buying this fan is a no-brainer for trail riders. The mounting tabs are already on the stock radiator frame. The Honda part description and number for the complete fan kit is:
Fan set, cooling
19000-KSC-000 - '04, '05
19000-KSC-D00 - '06, '07
The D00 kit includes additional parts: condenser, fan motor relay, sub-harness
The Cooling Fan Kit previously available for the '04 through '07 models is not listed for the '08 model. This does not necessarily mean that a kit cannot be fitted to the '08 model. The right radiator, which has the fan mounting tabs and thermostat tap, is unchanged from previous years. The '06/'07 kit had extra components that allowed it to be fitted on '06/'07 models even after some electronic components were changed or deleted starting with the '06 model. The '06/'07 kit should work on the '08 model, but you may have to run extra wires to the battery hot/ground (the wire harness is changed on the '08 model, wiring to the battery and a connector were probably removed.).

Click for Cooling fan kit installation.

Needle Doohickeybusy
This tool is used to remove the needle from the carb while the carb is still mounted on the bike.
Cost - $2.24


Drive Chain

I compared the stock CRF250X drive chain (DID 520MXV) to a T-ring chain (DID 520VT), an X-ring chain (DID 520VM), and an O-ring chain (Tsubaki 520 QR). The DID chains were 120 links long, and the Tsubaki was 110 links long, but I normalized its weight to 120 links. All the chains were new, fresh out of the box or bag.

The VT is a new chain from DID described on the box as follows:
DID 520VT Narrow T-RING chain - DID's 520VT chain is the latest technological breakthrough in sealed chain design. This Narrow T-RING chain is designed for Enduro racing motorcycles that can not accommodate a wider X-RING chain due to clearance limitations. (Rick's note: sounds like it's made for a 250X.)

UPDATE - DID now makes the VT2 chain, which is a narrow chain like the VT, but which has an X-ring instead of a T-ring. One advantage of the VT2 - rivet AND clip style master links. The VT2 master link (clip and rivet) does NOT fit the VT chain.

Weight (120 links) 4 lbs 4 lbs / 4 lbs .5 oz 4 lbs 4 oz 4 lbs 4 oz
Inner plates - overall width 10.5mm 10.5mm / 10.5mm 10.6mm 10.7mm
Outer plates - overall width 16.6mm 16.6mm / 16.65mm 17.15mm 16.4mm
Staked pins - overall width 18.5mm 18.5mm / 18.6mm 20.0mm 18.7mm
Shape of ring  T  T / X  X  O
Master link type rivet rivet / rivet or clip rivet or clip clip
Sprocket spacer no no recommended recommended
Chain color metal-gray gold and black gold and black metal-gray
Note stock-excellent best replacement excellent X excellent O
  busy busy busy busy

The colored ends of the rivet-type master link pins are mushroomed when you use the rivet tool.

The information in this table tells me that the stock MXV and new VT T-ring chains are lighter and narrower than the VM X-ring chain that I've used for the last 10 years. The MXV chain is metal-gray; the VT chain has gold outer side plates. Other than that, I could not detect any difference between the MXV and the VT chains. Their T-rings look identical also.

The DID 520MXV (06405-KSC-003) is available from Service Honda for about $90 (Jan '06).

The new DID 520VT is available from Kevin's Cycle Racing for about $90 (Sep '05).

The DID VT2 is available from CRFsOnly.com (extra clip style master link for $8.50), MotoXoutlet.com, and RockyMountainATV.com.

Honda calls the stock 250X chain a 'T-ring' chain, although others refer to it as a 'D-ring' (I think this is incorrect; they misunderheard the name). The cross-section shape is like a stylized T with the curved part being the outside circumference; like this, more or less busy

See also the D-Ring Chain information below from the May '04 issue of "the wrench". Yeah, he got it wrong, too - it's a T-ring!


Fuel Tank

How big is the 250X fuel tank and do I need to buy a bigger one?

The 2004 CRF250X Owner's Manual shows the following on page 12:  Fuel capacity 2.2 gal, 8.3 liter    Fuel reserve capacity: 0.4 gal, 1.5 liter

The question is, what is the total capacity, 2.2 or 2.6 gal?

In March '04, I measured about 2.25 gal when I filled the empty tank, but I wasn't being careful. So, I decided to measure again today (July 19, 2004). I used a beaker calibrated in liters and measured 9.750 liters poured into a completely empty tank. This includes burping the air out from around the white filler tube, probably more than the average rider will do.

Anyway, 9.75 liters is 2.575 gallons, which is 2.6 when rounded. I prefer to use 2.5 because you can't use rounded gas; it's not in the tank ;-)

Honda has published 2.2, 2.25, 2.4, and 2.6 gallons in various places, and I've been told 2.6 gallons by several knowledgeable people. I think I'll go with what I measured today; 2.5 gallons.

So do I need a bigger tank? I'm getting about 44 MPG, so a full tank of fuel should carry me about 110 miles, which is more than I usually ride in a day. For now, I'm sticking with the stock tank. Other riders who are getting poorer mileage may opt for the Clarke tank (3 gal, $180) or IMS tank (2.7 gal and 4.0 gal, $225), (from BRP).


Closed Course Competition Modifications (Thanks to DwightC, Albuquerque, NM and American Honda Motor Co, Inc.)

The January 2004 Honda Technician Newsletter ("the wrench") describes modifications that you can do to the 250X to increase performance. These modifications are also known as the CCC Mods. These modifications are "for closed course competition-only use" and they will make the 250X NON COMPLIANT with noise and emissions regulations on public lands. The article states: "In order to obtain the full-power benefit, you MUST make all of the changes in the procedure." My personal opinion is that a subset of the changes that keeps the 250X somewhat quiet will probably pass muster with public land management law enforcement personnel.

The CCC Mods apply to '04, '05, and '06  250X model years. I think you can do the CCC mods to the '07-'08 bikes, but I suspect that the improvement won't be as dramatic as on the '04-'06 models. The '07-'08 carbs are different spec than the earlier models, so the recommended carb changes may not be exactly correct and you'll probably have to do some fine tuning there. The exhaust diffuser is not removable on the '08 X. The '07-'08 X heads are a better design that more closely mimic the R model heads, so the X performance will already be a little closer to the R. The X performance has been improved by Honda and the CCC mods have been de-emphasized lately. There certainly is room for improvement in the X and doing the CCC mods is a step along the way. I'd say, do all or part, but don't expect too much in the end. A Thumper Racing 270 kit is a much better direction to go, in my opinion. That's why I went that route.

Replace the standard camshaft with an '04 CRF250R camshaft.
  Camshaft    14100-KRN-670

Replace the standard exhaust pipe (header portion) with an '04 CRF250R exhaust pipe. Don't forget both exhaust gaskets.
Pipe, Ex.
Gasket, Ex.
Gasket, Muffler

Replace the standard carburetor parts with the following:
Jet, Main (#152)
Needle Set, Jet
Jet, Leak (#70)
(Accel. pump bleed)

Set the pilot screw at 2 3/4 turns out.

Remove the diffuser pipe from the exhaust muffler.

Increase the air box opening:

Remove the subframe and air box.

Drill out the two pop rivets holding on the air snorkel, and remove the air snorkel.

Following the raised cut line, cut inside the raised cut line with appropriate tools while wearing eye protection.

Reinstall the air box, subframe, and all parts.

Change the Pink wire in the ECU circuit (Rick's note: the WR has a gray wire, the 250X has a pink wire; kewl)
Behind the left side cover there is a "Natural" color main coupler. On the ECU side of this Natural coupler there is a Pink wire. Underneath the Pink wire is a blank terminal plugged with a rubber cap. Swap the positions of the Pink wire and the rubber cap. Reconnect the coupler to the wiring harness. (In modified form, the pink wire is unconnected to any other wire.)

Remove the noise and emission compliant label from the rear fender.

Rick's note: in these mods, the stock muffler is retained, with the diffuser removed, but the spark arrester installed. If you do not remove the diffuser, but instead drill it in a few places, the modified 250X would be noisier than stock but quieter than a 250R. You would also have to adjust jetting. This could make the 250X quiet enough to ride on public lands.

the wrench May '04

I snagged two scanned items from the May '04 issue of "the wrench" that were posted on ThumperTalk by EricS in May, 2004. These are follow-ups to the original CCC mods that Honda published in January, 2004.

I urge readers to read and understand what Honda is telling you here, and then make thoughtful decisions according to your own needs. Note that they mistakenly call the T-Ring Chain a D-Ring Chain. See the Drive Chain topic above for more information about the T-Ring Chain.

busyD-Ring Chain

The engineers designing the CRF250X concentrated on making it as light as possible, to offer exceptional handling characteristics. Even the drive chain was looked at, resulting in the choice of a D-ring chain. This chain is 1.6mm narrower than an O-ring chain and, consequently, lighter.

Since this lighter chain was specified for this model from the beginning of its development cycle, the engine cases were designed to accommodate only this type of chain. If you use an O-ring chain, it will contact the engine cases, causing damage. Make sure you use only a D-ring chain on the CRF250X. Inform your CRF250X customers of this requirement, and have them note this information in their Owner's Manual.


busyClosed-Course Use

If a customer intends to use a CRF250X in closed-course competition, they must follow the modification instructions EXACTLY as stated in the January 2004 article in The Wrench. Doing some of the modifications and not others will not be beneficial to the performance of the bike. Discourage "home-brewed" air box modifications.

Remember, the correct jet needle position for CRF250X models with closed-course competition-only modifications is in the 4th groove.

Also, note that if the CRF250X model is modified for competition, the CRF250R maintenance/piston replacement schedule must be followed.


Pink Wire


The pink wire mentioned in the 'Closed Course Competition Modifications' section above is not shown on the electrical diagram in the Owner's Manual or the Service Manual. TomM provided proof of it's existence with several pictures. busy

The 'blank terminal plugged with a rubber cap' is right next to the pink wire terminal.

CRFX_Rider on TT says: "You can unplug it - use a paper clip to unhook that little pain-in-the-a$$ clip.... or just yank it out with the needle nose if you don't plan on hookin' it back up."

When removing the pink wire, it helps to separate the two halves of the natural-colored coupler. Then, use a paper clip or small probe to reach inside the half with the pink wire and release the small strip of metal which locks the pink wire end-pin in place. The pink wire and end-pin will then slip out of the coupler. Re-insert the pink wire into the adjacent empty slot so it doesn't just dangle in the breeze. Or make a K-dub switch like I did at My Modifications.

For more pink wire info, see:  ThumperTalk post - Settled the pink wire mod once and for all
The dyno chart is missing from the TT post, but I made a copy here:  Pink wire dyno chart


Some Prices

I looked up the prices of a few parts on the Service Honda web site.

Service Honda prices for Closed Course Competition Modifications Parts (1/27/06)

Description Part number

Price (each)

Camshaft - 250R - '04 14100-KRN-670


Pipe, Ex. - 250R - '04 18320-KRN-000


Gasket, Ex. - 250R - '04 18291-MM5-860


Gasket, Muffler - 250R - '04 18392-MK4-000


Jet, Main (#152) * 99101-357-1520


Needle Set, Jet (NCYS) * 16204-MEN-671


Jet, Leak (#70) - 250R - '04 99108-KRN-0700





* These are NOT stock CRF250R parts; they fall somewhere between X and R performance.

Service Honda prices for Other Interesting Parts (1/27/06)

Description Part number

Price (each)

Handlebar - 250R/X 53100-MEN-670


Spark Plug (IMR8C-9H NGK) - 250X - '04, '05, '06 31911-MBW-E11


Spark Plug (IMR8C-9H NGK) - 250R - '04 31911-MBW-E11


Spark Plug (R0409B-8 NGK) - 250R - '05, '06 31911-KRN-731


Jet, slow (#42) (pilot) - 250R/X optional 99103-440-0420


Seal set, Fr. fork - 250X - '04, '05, '06 51490-KSC-003


Chain set, drive (DID520MXV-120L) - 250X - '04, '05, '06 06405-KSC-003


Engine R/X

Piston - 250X - '04, '05, '06 13101-KRN-670


Piston - 250R - '04, '05 13101-KRN-670


Piston - 250R - '06 13101-KRN-850


Ring set, piston - 250X - '04, '05, '06 13011-KRN-670


Ring set, piston - 250R - '04, '05 13011-KRN-670


Pin, piston - 250X - '04, '05, '06 13111-KRN-670


Pin, piston - 250R - '04, '05 13111-KRN-670


Clip, piston pin - 250X (1 each) - '04, '05, '06 13115-KM7-700


Clip, piston pin - 250R (1 each) - '04, '05 13115-KM7-700


Gasket, cylinder - 250X - '04, '05 12191-KRN-671


Gasket, cylinder - 250X - '06 12191-KRN-731


Gasket, cylinder - 250R - '04 12191-KRN-671


Gasket, cylinder - 250R - '05 12191-KRN-731


Gasket, cylinder head - 250X - '04, '05, '06 12251-KRN-671


Gasket, cylinder head - 250R - '04 12251-KRN-671


Gasket, cylinder head - 250R - '05 12251-KRN-731


        Click here to see 2006 250R cylinder head and associated parts

Front Sprocket R/X

Sprocket Fr. 13T - 250R, stock 23801-KSR-A00


Sprocket Fr. 14T - 250X, stock 23801-KSC-670


Rear Sprocket R/X

Sprocket Rr. 50T - 250R 41203-KZ3-J20


Sprocket Rr. 51T - 250R, stock 41202-KZ4-J20


Sprocket Rr. 52T - 250R/X 41203-KZ4-J30


Sprocket Rr. 53T - 250X, stock 41204-KZ4-J30


Sprocket Rr. 54T - 250X 41201-KSR-J00


Fork Springs, Shock Spring 250R

Spring, Fr. 0.43 - 250R 51401-KZ3-J21


Spring, Fr. 0.45 - 250R, stock 51401-KRN-003


Spring, Fr. 0.47 - 250R 51401-MEB-003


Spring, Rr. 5.1 - 250R 52401-KZ3-J51


Spring, Rr. 5.3 - 250R, stock 52402-MEB-751


Spring, Rr. 5.5 - 250R 52401-MEB-751


Spring, Rr. 5.7 - 250R 52403-MEB-751


Fork Springs, Shock Spring 250X

Spring, Fr. 0.40 - 250X not available

not available

Spring, Fr. 0.42 - 250X, stock 51401-KSC-003


Spring, Fr. 0.44 - 250X not available

not available

Spring, Rr. 4.55 - 250X 52402-KZ3-J21


Spring, Rr. 4.80 - 250X, stock 52401-KSC-003


Spring, Rr. 4.90/5.00 - 250X 52401-KZ3-J41


Spring, Rr. 5.10/5.20 - 250X 52403-KZ3-J41



Why did I get a 250X if I already had a CRF230F?

The CRF230F is an air-cooled, 6-speed tranny, entry-level trail bike. It has short-travel, non-adjustable suspension, and a corresponding low seat height. It doesn't have any lights. It's based on an engine that has been used in Brazil for years, and it is even made in Brazil.

The CRF250X is a water-cooled, 5-speed tranny, hi-zoot off-road bike. It's the CRF250R's sibling, and has about 95% parts commonality with the 250R. It has state-of-the-art suspension, an aluminum frame, and all the other goodies found on bikes like the CRF450R and CR250R (the 2-stroke cousin of the CRFs). It runs circles around the 230F in all but the most slimy, tight situations.

I have the 230F for exploring and plonking and I have the 250X so I can keep up with everyone on all the faster trail rides.


Pictures and other info

Pictures of the pre-production 250X that was at the Denver motorcycle show on December 20, 2003.

First pictures of the CRF250R - Nov '03

Honda web site              My CRF230F

Motorsports Network - An excellent source of 250X info.

Moto Roman - some pictures from a Japanese site with some very interesting accessories for the 250X.

Photo courtesy of Motorsports Network

Photos courtesy of JMac24 on ThumperTalk

Horsepower / torque comparison
XR400R vs CRF250R

Numbers from DirtBike magazine, May and December 2003

  CRF250X '04, '05, '06, '07, '08    From Honda Service Manuals
Engine Type 249.4cc water-cooled single-cylinder OHC four-stroke
Bore and Stroke 78.0mm x 52.2mm
Compression Ratio 12.9 : 1
Valve Train Unicam; four-valve
Carburetion 37mm flat-slide with throttle position sensor (TPS)
Ignition Solid-state CD with electronic advance and lighting coil
Starter Electric start, plus kick start
Transmission Wide-ratio five-speed
Final Drive 520 T-ring chain; 14/53
Front Suspension 47mm fork; 12.4-inch travel
Rear Suspension Single-shock; 12.3-inch travel
Front Brake Single 240.0mm disc with twin-piston caliper
Rear Brake Single 240.0mm disc
Front Tire 80/100-21
Rear Tire 100/100-18
Rake 27º 56' - '04, '05
27º 54' - after '05
Trail 116mm (4.6 inches)
Length  85.6 inches - '04, '05
85.5 inches - after '05
Wheelbase 58.4 inches - '04, '05
58.3 inches - after '05
Seat Height 37.7 inches
Ground Clearance 13.6 inches
Fuel Capacity 2.5 gallons - '04-'07    2.35 gallons - '08
Dry Weight 236 pounds
Available February 2004


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