Does anyone know why Honda lowered the redline? 
Also, I recall reading somethnig about K0s having hotter cams than later 750s. What's the deal on that? The power output supposedly remained the same...right? 
I think it was a matter of reliability. The preproduction bikes were redlined at 9000 RPM and the test riders were told to keep the bikes in the red zone at all times. If they went up a hill and the RPM's dropped, they were instructed to downshift!
Power output remained the same? Depends on who you ask. I've seen some motorcycle reference books that list the specs of early and later K-series bikes. the K0 was rated at 67 BHP, while the later models were rated at 65 BHP, according to one book.
I'm thinking the cam, along with the choked airboxes, more restricted pipes and everything else the power would drop a bit. I wonder if Honda also detuned the bike a bit to keep the famous K0 primary chains from snapping...?
Interesting. I heard about the K0 models breaking primary chains and ventilating the case due to the "massive power", but don't know how much detuning would help. A different primary chain design would have been best.
Also, wouldn't 2hp difference be within manufacutring tolerances? I know that as engines come off the same line, for whatever reason, some just run a little better and make more power than others. Some making 67 while others made 65 or 69 wouldn't suprise me.
For example, Porsches are my main automotive interest (aside from SOHC Hondas) and I know that in the old 911SC, made from '78 to '83, the factory rated them at 180 hp. However, typical of Porsche, they were conservative with the rating. The engines would make a
minimum of 180 hp, while some were independently dyno'd at up to 204 hp from the factory!! That's nearly 15% more power! I guess Porsche wanted to make sure there was no WAY the engines had less than 180 hp.
So a 750 making within 5 hp of 67 or 68 hp (different sources rated the K0 with both numbers) either way wouldn't suprise me.
