Open exhaust jetting?

Sorry if this has been covered before. I havent been able to find a thread that involved the exhaust only.

Heres the deal.

I have and 81 kz440. Runs great other than the megaphone mufflers in pretty bad condition.

I would like to cut them off and replace with some insert baffles and chrome turn-down tips. I have the stock air box on and plan to leave it that way.

My question is, with the above set up, what size jets would you first try?

The carb currently has its stock jets (other than the main) in, which I believe are 65-primary main, 85-secondary, and 125-pilot.

Again, sorry if this has been covered before.

-J

Do a search at KZ400.com (plenty of model specific info.) and here for carb jetting.
More post on the subject than you can shake a stick at.
Every bike is different,displacement,climate and altitude(?),riding style and demands,
fuel octane and quality,and what has been changed from stock.
You will have to be the one to decide on what jetting to use,but a general idea of where to start can be obtained from those post.

When trying different jets, how far do you go up or down in the jet number to affect anything. I am trying to avoid buying way more jets than I actually need.

For exhaust changes, I typically see around 5% on the main jet, but with a totally open exhaust, you might go a little more. Maybe 10% or 15%. It's harder to guess with CV carbs like yours.

Start with just the main and see what happens.

Thanks for the direction.