MIKUNI offers you this universal intake pipe for your motocross, quad, dirt bike,... It has an axis of screw of 60mm. The sleeve is Ø33mm of fixation. It will then be able to mount 28mm carburetors and many other carburetors of your choice without worries. The rubber is of excellent quality as always at MIKUNI. It will not harden with time. If you want a quality product to replace your original sleeve, we strongly advise you to take this type of product.