For those that are interested i borrowed the drill set (imp, Numbered SWG) and compared pistons that i have laying around. Kyosho 3B = Number 56 = Losi Red, so after working that out i drilled some 3B's to make some 55's. Then i got the K' 3A's out and found that the 55 drill was a little sloppy and the 54 drill would not go through the hole at all, so they must be equivalent to 554 Losi (drilled) which is wot the xxxCR set-ups run. Needless to say i am now running 3 hole pistons B's in the front 35wt and A's in the rear 30wt, ae oils.
Hope that helps.
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