Have you measured it? Have you ridden a GPX w/ the 22mm to compare?YBS_Mike said:I should have said it better. It's the stock carb off the X4R. There's confusion as to what it really is. It's definately a Mikuni carb but it is not the true VM-26 Mikuni. They advertise it as a 25mm Mikuni.
YBS_Mike said:It's a 24mm since it's stamped in the throat. I have riddin the bike with the stock carb and the new 22mm and the 22 is much much better on the bike. It would never wheelie with just throttle in 1st and will do so easily with the 22mm. Seriously, I think the 24-26 is just too big for a 124cc motor. It never bogged at all with the 22 but it did constantly with the bigger carb. (Vacum drop)