Apparently, typical 4 stroke scooter engines actually produce less vacuum at higher RPM's. This, of course, is just when a bit more fuel pressure might come in handy. Has anyone noticed an improvement in oomph above 50mph or so after installing an electric fuel pump? I don't necessarily need more top end, but a bit more high speed acceleration would come in handy.
tomd, I know you've installed electric pumps. What did you you use and did you notice any performance change?