Haha..Sorry but Totaly untrue.ANY mods you do to Streetbikes,quad's dirtbikes with carbs.Its all the same your SUPPOSES to rejet with ANY MOD!..But do some research with the Airbox off..It will Draw to much air into the motor Making the Air/fuel ratio off.I do premix my own gas and i know that is correct.So i KNOW! for a fact that without this airbox lid.i will keep fouling plugs.Thats why alittle trick with quad is to drill a FEW! extra holes into airbox for more air.when you remove that Lid..its drawing in way to much.ASK! anyone such as myself who knows what there talking about with Carbs.I am a certified Tech for a yamaha/kawi dealer So i work on bikes and quads all day long..its my day job.But sorry cant help ya with that CDI!..but i know im running way to rich.I can hear it when its running ill clean the plug off start it up..2-3 mins later its just soo fouled out bike stalls.Put a peice of cardboard over where the airbox lid would go and to my surprize no more fouling plugs.So i need an airbox lid...