Is is EFI or carby? If EFI yes it could be a fuel pump problem, seeing as it comes good after a bit, it would seem it's not building up to required PSI fast enough.
If carby then again it could be a problem with the mechanical pump, or I think there is a float in the carby itself to regulate how much fuel sits in the carby ready for use, if the carby is becoming empty, it would take a few seconds for it to fill up to an optimal level again.
Kev.
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