Jump to content
Sign in to follow this  

09 Carb on 05

Recommended Posts

Having issues with my crf250x 2005 Carb.

The hot start was completely stuck and now with the new one it does not slide in & out. Where the hot start is located it seems that the walls inside are rather rough. To me this does not seem normal.

I have found a used 2009 CRF250X Carb but not sure if it will work on my 2005??

Any input would be greatly appreciated.

Share this post


Link to post
Share on other sites

I believe they have not changed the carb enough for this not to work. In 08 (?) they changed the pilot screw and the AP linkage, but the body and diameter are the same.

Share this post


Link to post
Share on other sites

im not positive yet as i havent measured them but i believe the 05 is a 37mm and the newerone is 40mm waiting to hear back on this site in another post i think it will be a good swap if true.

yup its true the x has a 37mm carb on the older ones for sure and the newer r have a 40mm.

should be a good swap.

Edited by lilman

Share this post


Link to post
Share on other sites

Thanks lilman

But if I go from 37mm to 40mm will my air boot and the rubber boot from carb to enjine connect to the the 09 Carb?

Share this post


Link to post
Share on other sites

im not home to measure but i assume the only change would be to the id of it

Share this post


Link to post
Share on other sites

i could be wrong but i think back in the old days when you bought a bigger carb the bigger part is the slide part of the carb the boots should be the same size...i could be talking out of my ass though

Share this post


Link to post
Share on other sites

i agree, its the i d that prob changed, just bored 3 mm probably

Share this post


Link to post
Share on other sites

correct me if I am wrong, but the X carb never changed. The R carb has been bigger since 06.

Share this post


Link to post
Share on other sites

I rec'd an email from James Dean (JD Jetting) and he has tested a 250R carb that does have a 40mm manifold on it. A 250x has a 37mm manifold.

Per his email....

"I had installed a 40mm carb on a 2004 CRF250R, which originally had a carb like your 37mm version, as a test to see how the motor would perform. This change is OPPOSITE of what most 2006-2009 CRF250R owners were usually making when the CRF250R went to the bigger carbs. Many of the newer CRF250R's developed a bog when using the bigger carb. The top-end power gain was not enough to offset the low-end issues, and slightly less low-end response."

Share this post


Link to post
Share on other sites

2009 X still has a 37mm carb, but you can probably save your carb. The Bore walls of the hotstart are not real critical as long as the plunger seals on the end. You could polish the bore and put the plunger back in with a little grease or anti seize. Use it more often to keep it , and the cable free.

Having issues with my crf250x 2005 Carb.

The hot start was completely stuck and now with the new one it does not slide in & out. Where the hot start is located it seems that the walls inside are rather rough. To me this does not seem normal.

I have found a used 2009 CRF250X Carb but not sure if it will work on my 2005??

Any input would be greatly appreciated.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By Hayden Ploeger
      So I have never actually posted on one if these forums. I usually just stalk them to get answers but I messed up and I might be out 800 bucks🙃
      I have a 2013 CRF250L that I recently bought and I wanted to get supermoto wheels for it. I got online and almost ordered a set of warp 9 wheels but then I saw an add on Craigslist. Long story short I purchased lightly used warp9 wheels from a 2012 CRF250X not realizing the axles are different sizes. The rims are the same size as what comes in the kit from warp 9 but the spacers and bearings are larger on the wheels that I got. Does anyone know if I can buy new bearing and spacer kits to go in these hubs to fit them on my bike or will I need to purchase new hubs entirely? 
      I work on a fishing boat and I'm off the coast of Oregon for a few weeks and wanted to order something so I can get these wheels on my bike when I get home.
      Thanks, 
      The guy who f***** up 
    • By yrun
      I have a new 16 crf250x.  Would like gear it up a bit for two track, orv trails.  How much can i drop the rear sprocket size without shortening the chain.
      Thanks men!
      Joe
    • By yrun
      I was working on installing new needle for JD jet kit today. While trying to get a bit more rotation on the carb i broke a little plastic tee on the top of carb (left side). I think its some sort of vent? Not sure if the brass part is threaded into carb or not? At any rate it will have to be replaced. Wonder where i'd get this little item?
      Any ideas?
      Thanks joe

    • By ronbuell
      Ever been bored or really ticked off by not being able to reach your fuel screw for trailside adjustments?  Well, I decided to do something about it, and not spend a bunch of money to boot!
      Parts liste included:
      Short length of brass tube. Short piece of old, broken speedometer inner cable. Nut from the rejects bin.   I welded the nut to the speedometer cable inner and soldered the other end to the fuel screw using the brass tube as a connector.  I didn't need or fab up a holder for the end, but I wouldn't be too hard. My DIY flexible fuel mixture screw works great and the price is right! I highly recommend this mod.

      Cheap, but effective DIY fuel mixture screw
    • By Frana
      Hi everyone. I’m new here so I don’t really know what to do but let me explain what’s up, so I bought this 2008 CRF250X today and everything looked in tip top shape, but within a few minutes of riding the engine and radiator gets to hot to touch and then the bike dies at low RPM, then it is a hassle to get it started(i drained the battery trying) and once it fires it dies super easily again like by touching the trottle or just idling and I have to be super cautious on the throttle to grt it going. I don’t know if it is overheating or if there is another problem, if anyone could help me it would be very much appreciated.
×