I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Re: 11 k9 losing power in high rpms
In cases of fuel flow restriction, it's more likely for the high pressure filter to be clogged, than for the pump to be faulty. As far as I know, eBay pumps don't include the filter/pressure regulator assembly, so the net result of a new pump, will be swapping a good quality, working part for a bad quality one. Just one of the reasons not to blindly replace parts, just because "they're cheap online".