FWIW... the TPUSA HC kit is quite impressive (HC kit here) . Its cams and high compression pistons. Add the igniter to it and you can get as much as 73Hp/50Tq ( TTP Dyno with HC kit ).

Those numbers are comparable to what most folks do with their 904 BB kits (with the exception of the ones that did head work, carbs, cams, etc...).

SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq NEW: 19 Goldwing Tour DCT