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Old 01-26-2013, 10:04 AM   #4
Strong Bad
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Joined: Oct 2007
Oddometer: 3,738
Many of the D-37 desert racers use the CRFX as a base. Having done it myself allow me to add a couple of things:

The R does not have the magic E button.

The R close ratio gear box is too close for desert usage (and assuming Rally Raid).

Many guys use R cams in the X head and there are different tuned cams that come on different years X & R.

Not uncommon for guys to swap the X head for the R head.

The R uses a 19" rear wheel, the X uses a 18".

Not sure about the newer bikes in the last couple of years, but the at one time the X had larger radiators.

I know that you can't directly fit an R pipe onto a X, how much of that is due to the different shrouds, tank size, or if the mounts on the frames are different or what.

If it was me I would start with the X, and I'm pretty sure that what JCR starts with for their Baja bikes.
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