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From 2002 HD Sportster Service manual:
883 rated 57 HP @ 6000 RPM
1200 66 HP @ 5200 RPM
1200S Sport 69 HP @ 5500 RPM
From 1999/2000 Buell Lightning Service Manual:
2000 X-1 101 HP @ 6200 RPM
1995-96 S-2 76 HP @ 5200 RPM
1997-98 M-2 83 HP @ 5800 RPM
To my knowledge, the XB 12's were to be 104 HP. My '04 XB12R, with a stock muffler, stock ECM and K&N air filter made 94 HP to the rear wheel. On the same day my old '03 XB9S made 80 HP to the rear wheel with the Buell race ECM, air filter(K&N) and race muffler. The 2000 1200S Sport I had made 69 & 70 HP on several dyno pulls the only change was from a V&H SSR2 system to a Super Trapp.
Buell's use the Screamin' Eagle 'Bolt-in' camshafts (except for th M-2), same with the lightened flywheels (also not in the M-2).
In my experience and part numbers the S-1 Lightning head is the same as the Thunderstorm head, but they went from a flat-top piston to a dome.
The heavier flywheel in the M-2 and XL's will 'feel' torquey-er. Buell's also gain from having an excellent exhaust system from the performance stand point, where as XL's get stuck with drag pipes and street sweepers, more for looks than go.
Buells also get to operate at higher RPM's thanks to rubber mounts, Sportsters were solid mount until 2003. As for HD using Buell hot rod stuff, look no further than the Sportster Nightster with XB heads, pistons, and cams(and much more HP).
As for all the dyno data, in the summer time, there is a shop here in Tulsa that had a summer long dyno shoot out, it had several classes like 1200cc Buell/Sportster, Imports, 80 inch V-2, Twin cam, etc. It included Saturday night dyno pulls(two pulls for $20), with beer and sometimes a band, and usually lot of girls and tons of bikes of all kinds.
http://badweatherbikers.com/buell/me...tml?1214305663
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