Kawasaki Forums - Problem with my Kx250F

Hellp everyone,I've got Kawsaki KX250F 2014,with 90 engine hours.well treated. before 3 weeks the problem started,while mid air jump the engine stalled.
and than the problem has really started,and for this day when it stalled, it kept stalling while riding,when ever i pull the clutch the RPM goes down and the engine stalls.
a day after this day the bike wont start, and when it do (with choke for example) the bike is revving up and down like maniac and then stall,and would not start again.
so now, three weeks after, the bike has been in two garages and 3 mecahnics didnt found the problem. the bike just wont start, when it do starts,you can actually ride it, because it normal - engine sounds good,has a lot of compression as normal and no stalling problems appears,only when shutting it again,then it wont start.

here are some facts about the bike for now:
spark plug replaced
throttle and throttle body check
have fuel
have oil, cooling fluids.
.all the cables checked,found damaged cable to the injector,fixed and still same problem
valves checked, needed to adjust the intake a bit, but still same problem.[
mechanic has searched all the snseors that seem to be working good, and checked the ecu for codes, nothing.

that's pretty much it, if I will remember anything else I'll add. this problem is going on for 3 and a half weeks, I'm going crazy about it.