ok so i have a 06 kx250f. has megabomb pipe and 4.1 muffler. no other mods. last year it ran idled and everything reved without popping and at the end of the season it acted as if the gas was bad.i think the carb was never jetted right. took it out last week wouldnt start without giving it gas( it is alot colder out then when it ran flawlessly last year) then when it did start it wouldnt run with anything less than giving it 1/4 throttle. so i took the carb off to clean out the carb and adjust the fuel pilot screw and i found a clogged low speed jet( as i thaught i would) so i blew it out with all the other jets put it back together, went 2.1/4 turns out on the mixture screw and it doesnt start. checked for spark-sparks good put a new plug in it for the hell of it, its getting fuel, but doesnt start at all after trying every possible way to start it. hot start cable is not stuck for sure. i dont under stand i thaught it would start up and run like garbage if the jettings off but nothing. didnt even switch the jets. so im ordering the right jet kit for the pipe and hopefull it starts. what do you guys think about it has me stumped!! what is the needle clip suppost to be at? 4 from the top?