I had been having trouble with getting my stock bore blaster with pro carbon reeds and no lid and toomey b1 the 310 main works great but the bottom end was bad so this is what i ended up with so far and it rips runs better then any setup on any blaster iv had 35 pilot needle clip 4th from top and airscrew is about 1 and half turns out maybe a little more but on castor 927 and went to just 93 octane no ethanol so just thought if anyone was bogging to get a bigger pilot jet and lower the needle jet untill it stops mine hits as soon as you crack the throttle