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Cam Shaft Bearings
Posted: Sat Oct 20, 2018 2:31 am
by holsa912
Does anyone know if you can replace the bearings on the cam shaft of a CRF250X 2006, rather than having to buy a whole new assembly? I've been to a local dealer this morning who says I can only buy the full assembly, but I have seen bearing kits online.
The bearing on the sprocket side of the cam shaft cracked as I fastened the bolts for the holder onto it. It must have been misaligned as I used the correct torque as per the manual.
Cheers!
Re: Cam Shaft Bearings
Posted: Sat Oct 20, 2018 7:34 am
by JimDirt
Welcome to the site !!
Unfortunately No, the left bearing can't be replaced , only the right bearing , so yes , you will have to replace the cam , sorry ....

Re: Cam Shaft Bearings
Posted: Sun Oct 21, 2018 3:09 am
by holsa912
Thanks for getting back to me
Damn, I was hoping I could change both sides

Re: Cam Shaft Bearings
Posted: Sun Oct 21, 2018 4:47 am
by holsa912
@JimDirt Thanks!
Damn, I was hoping that not to be the case.. Ahh well, a new cam shaft it is then.. Do you know if the cam shaft is the same on the CRF250R and CRF250X? I'm looking at a few breakers, but can only seem to find them for the 'R' version and not the 'X'.
Re: Cam Shaft Bearings
Posted: Sun Oct 21, 2018 9:20 am
by JimDirt
The grind is different , the X has a mellower profile and is not as aggressive as the R , some people change them for performance gains , it really depends on what usage you want with the bike , if its slow trail or single track riding , the X cam is not as much of a handful of power down low like the R cam is , you may like the R cam profile , I run a HotCams Stage 1 in my 450X and use it for tight single track as well as open desert riding , and i love how the bike responds , though more R cams are best suited for desert type riding when used in a X
Its a matter of , if your happy with the power delivery of the X cam then I would just continue with it , not everyone likes or needs the performance gain you get with a cam swap , not saying the bike will be uncontrollable , it will just have a more abrupt power delivery .... If you can get a R cam cheap , then try it out , if you don't like it , then continue looking for a X cam
Re: Cam Shaft Bearings
Posted: Mon Oct 22, 2018 9:39 am
by holsa912
Ok that sounds better! Did you do a straight swap of the cam on yours, or did you change the head/valves springs etc? I've read somewhere that if you change the cam you need to ideally change the cam, but I'm not sure how accurate that is?
I do mostly single track riding too (though there isn't much desert here in the U.K.

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Re: Cam Shaft Bearings
Posted: Thu Dec 06, 2018 3:34 am
by holsa912
Update**
Swapped the X cam out with an R cam and did the CCC mods too, the bike has been transformed, much more power down low and throttle feels a lot more responsive! Sorted out my jetting at the same time, and doesn't seem to bog as it used to. Surprising what small changes can do!
Re: Cam Shaft Bearings
Posted: Thu Dec 06, 2018 12:35 pm
by JimDirt
Glad you liked the change , yea , the power delivery is different , and if it suits the riding you do , then that is great
