KAWASAKI FD750D ISSUES

I HAVE AN EX MARK LAZER Z WITH THE KAWASAKI FD750D 27 HP LIQUID COOLED INGINE WITH 600 HRS OF USE. RECENTLY WHILE MOWING IT SHUTS OFF. iT WILL RESTART BUT SOMETIMES MISFIRES WITH SOME BACKFIRE AND THEN RESUMES RUNNING NORMAL AGAIN.
ANYONE HAVE ANY EXPERIENCE WITH THIS?