I found a thread where a guy used a pressure regulator from a Kia in his WR. Externally they are the same but the Kia regulator is set to a higher pressure. In theory the higher pressure would cause more fuel to flow through the injector up to the point of max capacity. Since the bike is way lean from the factory, it could act like a poor man's fuel programmer. The down side is the bike could be too rich in higher RPM because of restricted intake / exhaust. It's less than $20 for the Kia regulator. I'm going to try it and see if it makes a difference on throttle response. I will post a video of it.

@@ufixit I've seen that thread before, if I recall correctly he had to modify it somewhat to match OEM spec. Never thought of just running it as is at Kia spec. I'll definitely keep and eye out for that video, very interested! I'm taking a shot right now at the QFS warranty because the pump only lasted 5 months before it went (OEM was 20,000km).

Have this problem did anybody get a long term fix? Got a quantum pump and regulator and still bad You think I got a bad pump or regulator?

@@mr.wizard2028 hey man, I’m not sure if this is your problem but I figured out what happened to mine. I had some junk in the injector. Replace to fuel pumps and the fuel line before I realized it. If you haven’t checked that out, it’s easy to get it out, and you can spray some compressed air through it. Maybe maybe!

@@w_rnz thanks no thread on this that I found. So does your bike rip now I mean easy first and second gear no clutch whillie You should be able to get the front end up without using your clutch. Thanks for your help really appreciate your help.

Hard to say for sure but a bad regulator can cause low fuel pressure, which may cause what you describe. Hope you get it worked out.