No thats   what I used.. the boyesen reed say in instruction that you may have to drop the main by 6 sizes Because it can make them rich.The fmf will run on stock jetting say nothing about  running bigger jets. Also they were jetted safe form the factory.  Done plug chops to confrim I wasnt rich.I never melted a piston down the whole time I ran the setup. When I first got my quad 3 years ago. It had a 240 main  needle in 5th clip and a 45 pilot.  Running 44 to 1   now i run 32 to 1 Which it poured oil out of the flange. People never wanted to ride behind me because their quad got soaked in oil. But it would pull threw all parts  of the throttle. But after I jetted it down finally got it to quit soaking the silencer and for it to stop making a mess. But the biggest thing getting the pilot and the needle working right so you can get to wot to get it to pull full threw the throttle.