I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Re: 2007 GSXR 750 bogging under hard acceleration
If the replacement par is aftermarket then, it's an OEM 11 year-old unit, worth several hundred dollards with only 6500mi of service, vs a new cheap replacement unit worth several tens of dollars. Not necessarily an upgrade, depending on the condition of the OEM unit. If you replaced only the pump motor and not the whole assembly, then you also have the same high-pressure filter (and perhaps strainer) which is/are probably the source of the problem.
Finally the difference with making a measurement vs replacing the part (even if the latter is a good idea anyway), is that with the measurement you get a step ahead in troubleshooting regardless of outcome: you know it either is or isn't a fuel volume issue, for instance. On the other hand, replacing the part preemptively, is a gamble: if the problem is fixed, you know it was probably the part (although something in the replacement procedure might have just as likely been the real cause of the fix), If it didn't fix the issue, you don't really know much more.