250-500cc throttle cables too short?????

ive put a new twist grip on my 99 wr250,a domino part off a newer cr125 and the nipple on the cable woulnt fit so i changed over the cable with a new one for 250 wr 2000 on model and its still too short,does anyone know which model has a longer cable,its only mls out as if i remove the wheel in the throttle the slide shuts,and she'll run fine but theres no play and its not ideal set up,thanks

You can easily shorten the cable outer by a few mill, pull the metal ferule off the outer cable to expose the 'wound outer' carefully unwind several revolutions of outer, cut off the unwanted piece with a junior hacksaw and push the ferule back into place. You may also have to cut some of the outer sheath back to get the ferule back on. The trick is to be CAREFUL not to damage the inner cable by nicking it with the saw or trapping it in the end of the outer.

10 min job and it doesnt cost you anything!