Amazing what this will do for cold starts...40 degrees this morn and she fired right up....usually kills the battery before it'll crank when cold....not no more ...turn mixture screw out 2 1/2 turns for a much smoother idle while the carb was off....totally different bike...if you haven't done your klx250 and its a hard starter...this is the fix.... $12.00 shipped...you'll only need it for a few minutes...and can likewise...pass it on...best $12.00 I've spent for the cure...