CRF250X- Uncorking the true potential

[@hansschweikert9153]

I love a well made how-to. Clear, concise, no guessing. Thank you for your solid contribution to the CRF community. I tip my hat.

[@tommygola]

Excellent, no fuss video with terrific footage and crisp, clear audio, thank you. I just bought a mint 250X for my 14 yo son. I bought the X because is WAS choked up and not as quick as the R. No doubt he'll be begging me to uncork it in a few months time. I'll be viewing this again in my workshop! Thanks for sharing.

[@gabekenyon4882]

After uncorking the 250x it will be quicker than a 250r surprisingly

[@Vagab0nd]

Great video, you have a fantastic pace and the sound is clear and loud. Your Camera captures everything we need to see. Just fantastic.

[@christophertucker1414]

I just bought a 2004 Honda CRF250X with less than 50 original miles on it...after a good carburetor cleaning, it still has the throttle-snap bog down issue. I bought a Boyesen Quick Shot 3, JD Jetting Kit, carb rebuild kit, and newly designed fuel accelerator diaphragm and spring...and will be installing these over the weekend. This video was a PHENOMENAL HELP in preparation for the teardown and rebuild. Thank you for spending the time and extra effort putting together such an outstanding video...

[@chariflakchiri]

Thanks for the feedback. Glad the video is helping others.

[@artvarnson8009]

Great video.... Gonna do the same thing to a 450X I just bought..... And did he really just do all that work with with a button up dress shirt on without getting grease on it.... Give this guy a medal.

[@cypresssteve1]

Just put a jdjetting kit through my carby and modified the carby on my crf250x and I love it. Massive improvement over stock. Love it.

[@ajdclassics672]

What did you change to the carb other than jets

[@emfl4437]

Great tutorial, appreciate the effort in making the video. Very clear and informative

[@NTRGFX]

The tig welds on that frame are damn near perfect

[@unclequack5445]

They should be their done by robot welders.

[@bigmiker6471]

Thanks so much for the video! i have a 2004 crf250x that im going to uncork but i didnt know how to do that till now! keep up the good work!

[@chariflakchiri]

Did you uncorck it?

[@jamesbramblett3346]

Charif Lakchiri are you liking your 250x better after the mods you did?

[@chariflakchiri]

Yes, I did all the mods at once, so I can't tell what difference each mod would have made individually, but with all the mods the bike feels and rides a lot better.

[@EddyOtway]

So glad I have a 2 stroke, so much easier to get to the carby

[@TokyoOffroad]

Yes, 2-stroke carbs are quite a bit smaller making it much easier to get them out and work on. Also steel frame bikes have a lot more room around the carb. The CRF250X carb is shoe horned into the frame...

[@chariflakchiri]

The frame is thick and narrow, making all the components densely packed, with zero room for access without taking the whole thing apart. I hope I won't ever need to pull the carb out again...

[@lostinpa-dadenduro7555]

Charif Lakchiri Charif if you have time could you put together a video on your thoughts about the CRF250X?

[@bigmiker6471]

very very true, i have a crf250x like the one in this vid but its crazy how many things you have to remove to get to the carb

[@chariflakchiri]

LostInPA I'm not much of a vlogger, but I'll think about it.

[@robertwoods2505]

Great job! Thank you for sharing it.

[@davidcostantino7622]

Just bought an 07 250x, great vid, thank you.

[@TokyoOffroad]

Pleased that you enjoyed the video.

[@jmart228]

Great video, guys! Very instructional!

[@claytonsmoothy314]

Remove the right side number plate and cut the pink wire👍 I learnt this building team Honda race bikes in Australia.

[@Marvelfunfaqs]

Sweet video, awesome bike mods

[@JapoksFamilyOfficial]

I am planning to buy used crf250x, this is very helpful video, Thank you😉

[@79series]

Great details. Gee it starts easy

[@jesseb7022]

I accidentally rode off to the trails on my 300cc ktm sx with my air box cover off and oh man did it feel faster, I'll for sure be getting more air to the airbox for the next ride.

[@TokyoOffroad]

If you take the airbox side cover off the intake noise will sound louder possibly giving the impression of more power. However, on my 2017 250EXC I did mod the airbox and side cover a little to make it less restrictive. All I know is that it runs well with this and the other mods I've made.

[@jesseb7022]

It felt a lot faster, I also changed my spark plug the same day, I'm thinking that was what made the biggest difference now that I think about it.

[@lostinpa-dadenduro7555]

Thanks for this video. This is a bike on my list to step up to for next summer.

[@chariflakchiri]

It's a nice trail bike. Can hang with them smoker enduro bikes at the right hands, but I'm still a beginner so I take it easy. Engine is torquey down low and mid-range, very good at maintaining traction. I'm still setting it up. Next on the list is new springs for my 'new' weight when I service the suspension.

[@PennsylvaniaDualSport]

@lostinpa and here I was just gonna share this video with you and you were here two years ago already lol

[@Kolsch221]

Thank you!

[@TheMattboudreau]

Good descriptive video

[@benlundgren3760]

80% rider 20% bike

[@aidanmacdonald8949]

50/50

[@donpardon21]

You wont get power out of rider

[@490Adrian]

Without the bike what is the rider?

[@NickRomanoMX]

100% the bike

[@talon0863]

I like to put anti-seize on header bolts, less likely to break off next time.

[@zalanicht]

I noticed you still have the stock air/fuel mixture screw. Doesn’t the JD jetting kit want you to alter that?

[@Dede230]

Top man

[@bigdolmar]

Im trying to improve hot starting with my 250x, im new to enduro and stall a lot, hot restarts can take dozens of kicks/ kill battery. Will uncorking like shown here help or hurt hot restarts? Thanks!

[@huntwarbukz4117]

? Was the red needle clip already set to the 5th position right out of the package. ? I put mine in and now I’m second guessing if it was set. At 5th position I dint change it right out of packaging ..I dint put gas in tank yet so I can still take apart

[@chariflakchiri]

Hunt Warbukz Sorry I don’t recall exactly what the original position out of the box was, but I do recall removing the clip once and putting it back in the position recommended by JD’s instruction sheet.

[@soundslikeaplan841]

Hey guys great vid. I have a crf250x and it has a high CP piston and a low and mid range hot cam. Will this not work with the JD jetting kit? Because it bogs on take off, but when I revs over 2 grand its all good? Would really like to hear what you guys think??

[@TokyoOffroad]

It sounds like the bottom end is bogging due to being too lean. Have you tried richening up the fuel screw. If that doesn’t work then try a richer pilot jet.

[@soundslikeaplan841]

Awesome I'll try that and let you know how it goes

[@soundslikeaplan841]

It was help a little bit be not enough I think I will have to go with the pilot jet

[@colinmaxwell4806]

Where would you start with the jetting? I'm in south Africa at about 700m above sea level.

[@rdnthedirt]

Hi, i also am using vortex, toyo mods 10 map ecu....excellent product , lightning quick with no decel pop or burp, my bike is around 70 horespower give or take with mods currently

[@chariflakchiri]

What model is your bike? Certainly not a CRF250X...

[@gigizack]

70hp??

[@lmtada]

70 hp from 250x. Lol!! Divide by 2. More like it.

[@rocketj7449]

70 hp LOL

[@robjohnston3471]

Nice Dog 😊😊

[@mikeschlup5279]

I did a 175 main because I cut the 50 % of the side out...

[@unclequack5445]

Iv'e been through all this, 2 HP at best, Yes it's worth it if you ride a lot.

[@chariflakchiri]

Yes, but it's not about HP. It pulls harder, so I think it gets more torque boost than power boost. Haven't done a dyno to confirm though.

[@JapoksFamilyOfficial]

Where did you got your fmf exhause...?

[@frederickfastier6105]

if all i did was remove the snorkel would i have to change the jetting?

[@hanizakholen3726]

how about Lectron carb?thinking to put on my CRF250X..

[@MrBluesmeister]

No info on the fuel screw adjustments????

[@chariflakchiri]

Installed R&D Racing Remote Fuel Screw. Set it as per someone's suggestion on ThumperTalk and haven't touched it since. Sorry, forgot how many turns.

[@bradtraceyfouche6232]

Can you tell me where you bought all the parts from?

[@samrichmond3989]

what model and year is the megabomb selected for?

[@huntwarbukz4117]

Hi guys great vid. I have. A stock 2005 250x. Just bought. ?Can I do the air box mod and jet. Kit... even if I keep stock pipe ??

[@chariflakchiri]

The stock exhaust is very restrictive and isn't high flow compared to the aftermarket ones. If you don't plan on installing an aftermarket exhaust, the airbox mod might make the mixture too thin by letting in more air at high throttle opening, so the jetting needs to be adjusted to your combination of airbox mod + stock exhaust.

[@evgeniy690]

White shirt is, and where is the master's tie?)

[@jamesbramblett3346]

I did all these same mods to my crf450x as well as leak jet #50. If the bike has a "bog" this or an adjustable leak jet can cure this condition. Something I noticed was a lot of heat comes off that header so I fitted a e-line carbon fiber guard to act as a heat shield. Nice video

[@TokyoOffroad]

Yes, the e-line carbon header guards are nice. I had one on the KTM 500EXC I used to have. Charif did fit a remote adjustable fuel screw when we made the mods, so he can easily tweak the setting.

[@chariflakchiri]

Will get the CF header guard before the next ride ;)

[@jamesbramblett3346]

Tokyo Offroad I noticed the R&D flex jet in your video. I use them on all my 4 strokes. They are great just keep them greased under the rubber tube or they will corrode. The adjustable leak jet I was referring to controls the amount of fuel that the accelerator pump gets. Merge racing used to make them and also Boyesen Racing. 👍🏽

[@joeybergeron376]

Is there no way to properly cover the area to protect it from water and etc

[@laxkiller131]

How long did you mess with tuning?

[@motorco.9454]

👍

[@codymullins4523]

So with the applied block off kit did you take the air pump off

[@chariflakchiri]

Yes. Saved like a pound or so :)

[@pazpaz4930]

do you suggest cutting the air box on any dirt bike? like a ( 4 stroke fuel injection with a square style air filter(non foam and no oil))

[@TokyoOffroad]

Only if the airbox is over restrictive. If the bike runs fine and the airbox is able to flow enough air just leave it stock.

[@UndisputedKingofSnails]

Every bike is going to be a bit different, but yes most bikes come stock really choked up, but cutting the box alone will not help much and can actually cause issues. if you open up the air intake, you must change the exhaust and jetting as well. Search online for a good idea of the suggested do's and don'ts of your specific bike.

[@TokyoOffroad]

Yes, always adjust the jetting (or fueling for FI) if making significant changes to your intake and/or exhaust. If you don't you risk the bike running lean which will cause excessive heat and could result in the piston seizing.

[@thedukeofconway4209]

I’ve been looking at an 250x 07

[@chariflakchiri]

Great trail bike. Bit on the heavy side for the gnarly terrain.

[@finneganfun2705]

that has the unicam design. Is that swapped?

[@rdnthedirt]

Good job!! What can you fo for the husky fc350, it is very restrictive

[@TokyoOffroad]

I don’t know if you have already done any mods, or what map you are using. When I had a 500 EXC I change the exhaust to a FMF full titanium system (header and silencer) and changed the map to what was known as the Euro map (race map) and tweaked the TPS sensor voltage setting to richen. It made a huge difference to the engine responsiveness and power. I suggest that you ask some other Husky FC350 owners online for advice regarding specific mods and advice.

[@scotthewiseman2471]

My 450X has never started that easy, pre or post corking.

[@fraco_wr_crfr]

Where can I find one kit just like this one ?

[@xXRedEyedStrangerXx]

I remove nothing from my bike at all just loosen the carb and rotate it a bit and I can change my needles and jets just like that

[@chariflakchiri]

I tried that recently, but I couldn't make it work. I might try it again next time I need to rejet.

[@tjlovesrachel]

Adam Krasnecki do you have the same make and model??

[@rocketj7449]

@@chariflakchiri you have to squeeze the clutch and clamp to hold in that position. That gives you more room to rotate the carb. Also, you can get to the needle from the top without removing carb. Flick the throttle to bring the needle up. Such a pita to remove that carb.

[@Wesley..]

What size is the starterjet?

[@Kolsch221]

Ok, so where do I find Newton meters to foot pounds chart at?

[@TokyoOffroad]

I usually use Siri for conversions, quick and easy. Or type in "convert newton meters to foot pounds" in Google and you'll see a list of web pages

[@tjlovesrachel]

Kolsch221 T lollll google

[@leetheriderforlife7548]

Where do I get them indicators from that are on the back of the bike Thanks

[@chariflakchiri]

DRC Type 586 Flashers (www.drcproducts.com/elect/d45-58-617/index.html)

[@magni1200]

Nice job!!

[@whitthacker__9425]

What brand rear seat Handle does he have

[@chariflakchiri]

Tugger Lift Straps www.thetugger.com/index.php?route=product/category&path=59

[@genaminin]

Could you please give a link to part numbers and brands to buy for replacement

[@chariflakchiri]

Here's what I've put on the bike. Let me know if you have a specific part in mind. Cycra Probend CRM Handguards (Part Number: 1CYC-7401-32X) Notoil Air Filter and Air Filter Cage FMF Q4 Muffler (Part Number: 041249 ) FMF MegaBomb Header (Part Number: 041431 for Stainless Steel. I have the Titanium version from the 2004-2005 CRF250R, but they don't make it anymore) JD Jetting Kit (Part Number: JDH003) R&D Racing Flex Jet Fuel Screw Applied Racing CRF/XR Emissions Block-Off Kit Applied Racing Crankcase Vent Kit Trail Tech Honda Digital Fan Kit (Part Number: 732-FN6) Tugger Lift Straps (front and rear) Devol Radiator Guards (Part Number: 0101-1202) Devol Skid Plate (Part Number: 0102-1201) Decol Front Disc Guard (Part Number: 0104-1103) Devol Rear Disc Guard (Part Number: 0105-1103) Works Connection Rear Brake Caliper Guards (Part Number: 25-014) Works Connection Rear Master Cylinder Guards (Part Number: 15-070) DRC Tough Start Lithium Battery (Part Number: D45-09-102)

[@johncarlson1877]

I hope you are replacing the battery with shirazi lithium ion battery at only one pound that should be the 1st mod duse!

[@chariflakchiri]

Yes, replaced with a DRC Touch Star lithium battery. Saved a couple pounds there.

[@johnmeurer4780]

Never seen anyone change jets without taking the bowl off

[@chariflakchiri]

Me neither. We took it off to rejet of course.

[@alexdouthat5316]

you should also do the pink wire mod

[@chariflakchiri]

Thanks for the suggestion. The pink wire mod raises the rev limiter by 500rpm, which is of no interest to me for now. It only makes sense along with an R camshaft in order to gain more HP up high, but you lose a good bit of low end torque. For the kind of riding I do, which is slow and technical, I don't plan on making any more CCC mods.

[@MotoBuilds]

500 overrev is just one benefit of the pink wire. It also advances the spark timing a bit throughout the range and gives noticable power in the bottom end as well. You can always unplug it, slide into the empty slot, ride and then reinstall it to it's proper port if you change your mind.

[@rdnthedirt]

I wish i knew your emsil, i would send you some pics of my bike,ect....

[@JeankArias]

horse power difference?

[@chariflakchiri]

Did not bother do before/after dyno measurements, because I didn't have access to a dyno. Moreover, I don't ride the upper rev range that much to notice a difference in peak horsepower, but the bottom end and mid range definitely feel stronger with more pull.

[@mehdimohebi6155]

this bike is in lran now ,l buy it,it is very good,where do you live,

[@TokyoOffroad]

Both myself and the bike owner at that time are located in Tokyo, Japan

[@TheAneewAony]

Are you sure it's a titanium MegaBomb?

[@chariflakchiri]

Yes :) It's was a brand new titanium MegaBomb for a 2004~05 CRF250R, which fits all model year CRF250X. FMF stopped making titanium MegaBombs for the CRF250X after 2006 and only offer stainless steel since then. I was able to find mine on a local online auction site. Apparently the seller had it sitting in his closet in its original box for 10+ years...

[@TheAneewAony]

Nice! Titanium is certainly great looking too. I have a stainless MegaBomb on my X and it's amazing. Much better than the PowerBomb. Great video.

[@gilsincrfx2496]

É um cabeça de bagre mesmo...

[@lombardozarateiii6920]

U gotta remember those old pipes have carbon build up thats why they would weigh more

[@judevanz175]

Lombardo ZarateIII not much more lol

[@awesomebilly9601]

not even a gram more

[@justinm.3594]

What year bike is this?

[@TokyoOffroad]

It’s a 2009 US spec model

[@justinm.3594]

Tokyo Offroad thanks!

[@freddyhyslope5415]

I see you have turn signals did you make you bike street legal

[@TokyoOffroad]

Yes, the bike is registered and street legal.

[@chipper442]

I’m sorry, but the three horsepower gain, that nobody without a pro license could feel, or use for that matter, isn’t worth hacking the crap out of a perfectly good air box. Most weekend warriors can’t even use the power available in stock form. Not to mention the potential damage, should you hit a water crossing and suck some gritty water. Just not worth it to me.

[@neveragain5782]

Is the 250x that loud?

[@TokyoOffroad]

No, fairly quite actually

[@neveragain5782]

Ok thx

[@chariflakchiri]

@@neveragain5782 Stock it's very quiet. With the full FMF, it's louder, but it's not obnoxiously loud either.

[@RamiroAADias]

Pena não traduzir português 🇧🇷🇵🇹

[@ariel_monaco]

2:15 世田谷！

[@TokyoOffroad]

Yes, I live in Setagaya-ku…

[@tjlovesrachel]

Waaaait a min... did I see the old cut filter back on that bike ?

[@TokyoOffroad]

No, we installed a new, freshly oiled air filter

[@finneganfun2705]

what da dog doin'?

[@bear1568]

Too much to do, for mechanically challenged person like me.

[@chariflakchiri]

Agree. But having the space, the right tools, the service manual, and an experienced friend to help definitely makes things easier

[@bpowa]

nice vid.. your friend has no clue and looks lost working on his bike. I'm sure you had a lot of directive.

[@chariflakchiri]

That was the second time I pulled the carb, so I "kinda" had an idea how to go about it, but using Tokyo Offroad's workshop and tools and having his help and advice definitely made things easier. We all start somewhere.

[@Lynch_Odhran]

Charif Lakchiri you sound so kind and this guy sounds so judgmental. Hope your enjoying your bike if you still have it.

[@codenamenoob4973]

Just buy a KTM and save yourself the hassle 😉

[@TokyoOffroad]

Code Name Noob - Not true. Stock KTM EXC-F bikes are choked up with emission crap too and need uncorking if you want full power. JD and other sites have dyno charts and mod details. Eg. A stock 450EXC is about 39Hp and 51.5Hp after uncorking (SXF silencer, airbox reeds removed and fuel tuner). That’s a huge difference. A stock 350 with 36Hp goes to 43Hp after similar uncorking.

[@codenamenoob4973]

@@TokyoOffroad I'm just teasing of course, all this EU emissions crap really sucks. Luckily I'm not rich enough to afford the bikes that have to follow all these more recent laws, although I might put myself in some debt shorty to get myself a husky 701 SM but of course again heavily choked up stock until you fork out £800 plus to unlock the bikes full potential or most realistically the way they where intended to be by slapping on a power up kit (new airbox, silencer and some other bits) it's very frustrating that if you buy a new bike you have to pull it apart or blow more money on it just to uncork them, really feels like a scam

[@TokyoOffroad]

Code Name Noob - It’s not the fault of the manufacturers. They are just following the regulations and policy laid out by the EU and US. If they don’t do that they can’t sell bikes. It’s lucky as a consumer that there a reasonably cheap methods to convert them to full power, for closed course use... :-)

[@dracgotbands]

It’s fuckin annoying how Honda always restricts the power and sound of these bikes

[@TokyoOffroad]

Indeed. The new CRF450L is a prime example. The Japan domestic model is strangled to 24Hp. Yes, that's not a typo, misunderstanding, or mistake. 24Hp. If you"re in the US you have it lucky and they produce about 40Hp stock...

[@dracgotbands]

Tokyo Offroad I wonder why Honda does that tho🧐

[@TokyoOffroad]

Honda (and other manufacturers) design the bikes to pass the exhaust emissions and noise regulations of the the regions the bikes are sold to. Unfortunately the regulations are becoming tougher and tougher to pass, typically requiring the manufacturer to neuter the performance by restricting the air intake and ECU. So going forward I wouldn't hold my breadth expecting manufactures to deliver bikes which perform well stock, fresh out of the crate :-(

[@dracgotbands]

Tokyo Offroad ohhhhhhh well now I know😛

[@primalcarnage2480]

do mine

[@johncarlson1877]

Sorry should a been dude

[@twowheelflyercr]

REMOTE FUEL SCREW !

[@chariflakchiri]

Yes. I fitted the R&D Racing Flex Jet Remote Fuel Screw.

[@gixxer7907]

Proper crap design by honda that you've got to undo the rear subframe and take the shock off just to remove the carb 🤦🏻‍♂️ the older bikes you just take the tank off undo the jubilee clips on the boots and pull it out so much quicker and easier

[@jocrp6]

That bike already looks like Afghanistan,,, Depleted and used up,,

[@chariflakchiri]

It has seen some action indeed.

[@jamesbramblett3346]

Did you just remove the "mesh" from airfilter cage or go with another brand cage? No concern about backfires and the possibility of catching your petroleum soaked airfilter on fire?

[@chariflakchiri]

I went with an aftermarket mesh-less cage. The air filter catching fire from a backfire is possible, but extremely rare. I am using the NoToil Super-Flo kit, and the airfilter is said to have a flame retardant inner lining that will protect it from hot spark generated by the backfire. With all the mods, I noticed the bike backfires a lot less than stock, especially after I removed the smog pump. The air filter stock mesh screen seemed restrictive so I wanted to run the bike without it now that I opened up the airbox. Next time I'll inspect the inside of the airfilter for any indication of heat marks and may install the stock mesh screen back if I find any.

[@jamesbramblett3346]

I agree the backfire and fire would be extremely rare. You should be ok as long as you continue to use the no toil foam oil. I really like the belray foam filter oil so I have been very hesitant to remove my backfire screen. I have a 450 and really don't need any more power anyway.

[@jaredhouser9418]

I'm having a hard time getting the vent tubes back on the airbox, the one especially next to the shock any tips?

[@chariflakchiri]

Jared Houser I removed the smog kit a long time ago. I used to route a couple of tubes back into the air box. I used Applied Racing’s blockoff kit to close the holes. Unless you’re referring to other tubes?

[@ROCkamikaze]

nice video, So, do you know how to uncorking "CRF450L" ? I'm thinking about buy that...

[@TokyoOffroad]

ROC kamikaze - I’m guessing the restricted version of the CRF450L (not yet available) will have airbox, ECU and exhaust restrictions. Airbox and exhaust it may be possible to modify, but the ECU would probably need to be replaced, or a piggyback controller used. Won’t know for sure until they are available though.

[@ROCkamikaze]

Yes, that's right. I can't get some information about that... thx a lot !

[@TokyoOffroad]

In Japan a 2019 KTM 450EXCF is the same price as a CRF450L. The KTM can be purchased unrestricted, is about 18kg lighter and larger fuel tank. If the Honda had long service intervals I could see the attraction, but it’s doesn’t. Still keen to test ride the Honda though...