Congrats on the bike... I've had my '78 CB400 for about 12 years now. I replaced the mufflers shortly after I got it with aftermarket, but very similar to stock ones. I don't know about the '79, but the '78 came with dual exhaust.
I only run Shell or Petro Canada 91 octane in it only...
I do pretty much the same thing on my '78 Honda and my '99 BMW... just keep in mind you WILL fill your neighbourhood with smoke. It also works great for getting crusty old neighbours off their front porch!
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