I am planning on removing the baffles from the stock exhaust on my sportster, also ordered a high flow air filter. just wondering if I need to rejet my cv carb it has the stock jets in it now. I believe they are 45/ 180 what would I need to go up to or change with the carb?

 

start with a carb kit (about 40 bucks) only before you rejet. I did the same with the high flow K&N filter and SE slip on exhaust and thought I needed to rejet but a trusted mechanic (Shane at Hartman Cycles) advised against it, he installed the carb kit and the bike runs great with no more hichups or coughs .... not too lean or rich

 

Both my sporties are a size up on the low speed jet with just a mixture screw adjustment. You can shim the needle, or even get different needles in some of the kits, and supposedly make it work on the factory jet, but the bike spends so little time on the low speed jet circuit I just did it the cheap and easy way. But you'll need to do something, stock carbs are set really lean and it'll probably pop and fart quite a bit at low rpm shifts and throttle changes. I've heard you might get a little better mileage with some of the kits. Good chance you'll lose some mid range punch, too. Both my sporties had straight pipes when I got them, and got better mid range power when i put baffled mufflers back on them, and still ran better keeping the bigger low speed jets, too.

 

I would go up one size on the idle jet, the idle jet flows all the time so going up on it helps on the wot also. You also want to drill out the plug so that you can adjust the idle screw. Then see how it runs, to determine any further changes.

 

You are bound to need to adjust the carb in some way! Your bike, if the carb is bone stock, has settings to comply with EPA regulations at the time it was manufactured and they were not optimum then. So any changes you make today will take those settings further from optimum. I suggest you start as Harleycruiser recommends!

 

I know this a old thread and you probably have it all done and running great but thought I'll throw in my two cents. I had a 99 sporty with a stage II arlen ness air cleaner 1 3/4" drag pipes everything else stock. I did lots of changing with jets and different positions with the idle mixture screw. The best I found for both wide open and cruising was 48/195 set up and the mixture screw out 2 1/2 - 2 3/4 turn (or where your bike idles the nicest). Bike ran really well, butt dyno noticed a huge increase!