CB1100 vs CB750 Exhaust Tone – What's Behind the Difference?

[1973cb750]

Hey everyone,
I'm back again with another question about the CB1100, in hopes that someone has the time to teach me more about the mechanical aspects of the great CB1100.
I recently came across a video comparing a modern CB1100 and a 1970s CB750 K Series. Both bikes are running what appear to be Wyvern-style exhausts, and visually, they’re quite similar. But when it comes to sound, there’s a clear difference: the CB750 has a raw, wild tone that I find incredibly appealing, while the CB1100 sounds more refined and subdued.

https://www.youtube.com/watch?v=ckJwYVSpegk

This got me thinking:

What determines the sound characteristics of a motorcycle exhaust?
Besides fitting a reproduction Wyvern exhaust, is there a way to tune or modify the CB1100 to more closely match the CB750’s aggressive tone?
In the video comments, someone said:

"Sounds like a hotter cam to me. It would be cool to hear a 1100 with a similar cam profile."

Can anyone here explain:

• What exactly is a hotter cam?
  
• How does it affect the exhaust note, and engine behaviour overall?
  
• Would it be practical (or worthwhile) to fit a more aggressive cam on the CB1100 for sound and performance?
  
  

It also seems to me that the commenter is implying a hotter cam can be installed, based on how they phrased it. Or am I misunderstanding?

Looking forward to hearing your thoughts — especially from those who’ve done performance or exhaust work on these bikes. Thanks a lot! 


its port size cam profile and 2 valvbe vs 4 valve mine sounds pretty close to my dads 750 i built a custom exhaust the cat also takes away lout of beautiful noise