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I have a 904'd 865, and judging by how my front wheel lifts off the ground I'd say it increased the hp!
Cool,  Since you're here, how much more money was the 904 conversion after the initial parts purchase? Did you do head work while you were at it? It's worthwhile to the discussion since the original topic was based on the dollars to horsepower ratio.
I did the Wiseco 904 kit along with installing 2mm larger intake valves and 1mm larger exhaust valves, along with porting and polishing the head and intake manifolds.
The total cost of the Wiseco kit, including machine work but not installation labor (I did it myself) was around $800 dollars. This includes $500 for the kit, $200 for machine work, and $100 in assorted parts and gaskets not included in the kit.
The headwork ran about $600, mostly in labor, but the valves themselves cost $250 and the valve seals cost about $80-100 bucks; exspensive little rubber bits.
Total cost was in the neighborhood of $1400. It runs well, I've been messing with a few things to tune it better and then I'll get it dyno'd. It has been lifting the front wheel in first gear (no clutch dropping) and when letting the clutch out in strong upshifts to 2nd gear. It is much stronger than stock. I'll post dyno runs when I get one. Probably in a few weeks.
There is no greater thrill than being shot at with no consequence. -Churchill
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