yeah...i've got a buddy with an 03 busa with ~85xxx miles on it that started to do this over the last 6-8 months. i don't think its had the valves checked either. starts up fine when pushed started. he has all new charging system,new starter and battery. i told him it might be valves but what do i know.
BMC, Full M4, ECU flash, F/R SS brake lines, -1, bazzaz afm
Old: 01 750
New: K6 1000