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i went with the wiseco kit when i did mine. the stock sleeves bored get very thin. the weisco sleeves are pretty thick. with major heat everything i read says that the weisco kit takes it better and actually gains power while the nikisil expands more because its thin.



I am going to have to differ with you on this. The wiseco sleeve require a lot more material to be bored out of the stock barrels, both for the main sleeve and a 6mm per side larger shoulder at the top of the bore, the iron sleeve is them shrunk into the aluminum bore. With still plenty of meat left. THe nikasil bores are just 2 mm larger with plating. A lot less metal removed and no wieght added, lower co-efficient of friction between the nikasil bore and the rings. As was previuosly said both types work well.

On the pistons, I have the 12:1, with the head work, I am probably slightly less, but still have to run premium. If doing over would go with the 11 or 11.5:1 pistons. The wiseco piston do not quite measure out equal to the compression values they claim.

Oh and - do it, do it, do it. You won't be able to wipe the grin off (unless you get a new thunderbird)

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