Naraku 5mm Jet Tuning Kit for Dellorto Carburetors. This 10 piece kit contains jet sizes 50,52,54,56,58,60,62,64,66, and 68. Intended for use with carburetors that use a m5x.80 threaded main jet. Dellorto carbs are found on 2-stroke Yamaha Zumas as well as 2-stroke scooters from manufacturers such as Aprilia, Malaguti, Derbi and others. Please see our Warranty & Returns Policy.