I have an x18 and I'm looking for a new carb. I'm going to get performance ignition coil, ngk plugs, performance cdi. I can get a 22mm carb all day but I saw a 26mm makuni by the same guy. I would much rather see a makuni carb on there, but I don't know if it will bogg down too much due to too much fuel. I have a x19 that has a 22mm carb and it boggs down at lower rpm, but I have stock ignition. That could be due to a ****ed up air to fuel ratio but I'm going to let this question go to the experts.