I do not have the exact length of the Motion Pro Cable for your '01 Honda CR250 but I can say these cables are made to the same specifications as the OEM cables so it would be the same length as your stock clutch cable.
I've used this cable before and for my 2009 KX250F it was an exact replacement. You might try going to the Motion Pro website and finding the cable length and style you want and then come back and see if MotoSport has it in stock. Good Luck!
Yes, This Motion Pro cable is the exact fitment for your bike. It would be same length as the original clutch cable. I could not find any extended cables that are made specifically for your Suzuki SV650. I do know that Motion Pro will make custom cables though. I would recommend contacting them directly and they should be able to manufacture a cable to the specific length you would need. http://www.motionpro.com/
Depending what bike this is for, it will have either the lower adjusting nut or an inline adjuster. It does not include the adjuster at the clutch perch as that item is associated with the clutch perch itself.
the image is a generic depiction of a clutch cable and doesn't necessarily show what your application has. These are stock OEM type replacement cables, you'll get the cable that looks similar to your make/mode/year.