Any jetting needed for 4-2-1 exhaust on otherwise stock '82?

[fizzlebottom]

My factory 4-into-4 mufflers are 39 years old and turning to dust inside. I'm sure I could get mufflers alone, but I'm likely gonna buy a 4-2-1 system from Ripple Rock Racers (https://www.ripplerockracers.com/produc ... s-1979-82/). The muffler comes packed with baffling, so it isn't a straight-pipe situation.

Everything else on the bike is stock. It currently starts easy, carbs are properly sync'd, and everything else is well adjusted. What is the likelihood that I'll need to fiddle with jetting?

[Volker_P]

As the CV (VA44) carbs are not that sensitive to air or exhaust mods as the piston (PD51) carbs you probably do not need to care for jetting.
But as the CB650 stock jetting is already quite lean it is a good idea to have a look at the plugs. It is all right that CB650 plugs are a bit white.
If you mpg is low and your plugs look dark this is a hint that you might be on the rich side.

[fizzlebottom]

That matches what I was thinking. I might grab a set of 120 mains just in case, but I'm gonna keep the stock 118s in until my plugs are showing issues and anything else is ruled out.

Thanks for the validation.