I Just got a killer deal ($18) on a slightly used mooseracing billet thumb throttle, only problem is that its for a 400ex, I would really like to put it onto my 250, after putting it onto the bars, I realized that the part of the throttle cable that threads into the throttle is too small for the throttle, and the 400ex cable is too big for the 250 carb, is there anyway around this?

Thanks guys, I'd truly be lost without this forum 

Wow, thanks motoman. I really had no idea that was even possible. I just emailed motion pro with the specs that I'm looking for.  https://www.motionpro.com/motorcycle/custom/

Kinda feel dumb that I didnt even think that custom cables were a thing 

Or you might get lucky & find a local shop that makes custom cables. Thats what I did.