the 904 kit has liners (ductile iron, I believe). to use the kit you have to bore out the stock cylinders and shrink in the new liners and then bore and hone them to size.
with the 10.5:1 piston you should have no problems with ping or knock on 89 or better gas.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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