Dogger......the carb shown in that link is an older model with no pump. I had one of those that I used on three different bikes, a stock 95 XR00, a '98 HRC 628 and later adapted it to an '00 WR400. In each case, it was a definite improvement in performance over the stock carb. That said, the pumper version is an improvement.
'98 BMW F650
'98 Moto Guzzi V11
"Once you go over the hill, you start picking up speed!"