Hi I´ve got a cb750c which I´ve taken the stock airbox off of & also put 4 into 2 aftermarket exhaust on.It has hi-flo individual air filters.The bike bogs on the hi-speed jet & I need bigger jets.Can anybody help me as to which size,brand, supplier etc.for the jets.The carbs are Keihin VB42D.Thanx,Stash