just replaced clutch cable

hi guys and girls first post here and im looking for some help with my ZXR250C i just replaced my clutch cable with a A model cable cable it was about 3mm longer than the C model clutch cable now when i start the bike and put it into gear it stalls i have it adjusted correctly i can hold the clutch in with the bike in gear and start it soon as i even the slightest bit release the lever it stalls i think it could have something to do with the saftey feature in the clutchlever how can i fix this?