What pilot would you recommend? I'm using a 50 at the moment in 33pwkThe 2's peak just a tad bit more, like a 1/4 HP. Great for drag bikes I suppose, but the new VF4 is capable of delivering near the same peak as the 2's and still pick up lots more throttle response and help with the lack of bottom end grunt. As mentioned earlier, make sure to give it a bit more pilot. They eat a bit more fuel which translates to more power.