Manufactured in the period 1981-83, this carburettor model was dedicated exclusively to racing. In particular, it was designed to equip the 2-stroke grand prix motorcycles, the Suzuki RG 500 XR 40, 4 cylinders with rotary valve (4 carburettors, two right and two left), of Team Gallina, winner of the 1981 MotoGP world title with Marco Lucchinelli. Its characteristics, however, made it versatile and also suitable for smaller displacement motorcycles, such as the 125 cc or 250 cc grand prix. Conceived, designed and built for motorcycling excellence (where weight reduction immediately translates into greater agility and performance), this Mikuni Kogyo had to combine the highest standards in terms of performance and the lowest weight levels, so the selected construction material was magnesium. From a traditional aspect, its real peculiarity is precisely that of being made entirely of magnesium, including the float bowl. This peculiarity, for the more experienced, can be seen directly by the naked eye thanks to its unmistakable golden colour, due to the treatment with a particular type of acid which on the one hand stops the oxidation processes to which magnesium is subject and on the other contrasts its high microporosity (which weakens its structure), extending its life-cycle. Transferred to karting, since the carburettors were not manufactured specifically for this category, this Mikuni replaced its aluminium counterpart, thus allowing an overall saving in terms of vehicle weight. The following were the engines it was most often combined with: the single-cylinder 125 Mac Minarelli, Asco, Villa and Rotax with gearbox.