Okay, so i definitely see now how I left out too much information.
So I found out the yoshimura 4 into1 pipe isn't really open, but has a fair amount of internal baffleing in the middle of the pipe.
When I initially put the pipe on and went for a test ride it honestly felt exactly the same as stock exhaust but sounded better. Prior to the exhaust installation I put new spark plugs in and ran them for a bit and they looked near perfect. Since I have put the exhaust on I have not changed the plugs to see how it has reacted to the change but I will do so soon hopefully.
So what brought up my concerns for changing the jets is two minor things.
-very specifically holding the rpms at a steady 3k while riding I can hear some quiet popping. (Slightly suspicious of an exhaust leak but I don't think so.)
-Deceleration pops when rolling off throttle from high rpms. (I don't really spend too much time in the higher rpms. I don't like to thrash this engine too much unless I'm doing a canyon. I like the bike too much)
Overall tho the bike feels to be running really well. I have no issues cold starting, (live in southern CA so lowest maybe 45°F ish?). Power feels good, but can't really compare to anything else, last time I owned a 550 was a long while ago. However I feel like my fuel economy isn't the best. Goal wise I would like the bike to be decent in all categories of tune, not really looking for more power but would like to be in the healthiest tune I can get.
The keyster kits I have aren't really the rebuild kits, but a keyster tune-up kit. comes with 6 main jets, 3 pilot jets, and 4 needles, all varying sizes (also gaskets o rings and everything else to rebuild)
Currently I'm on the Yoshi 4 into 1 pipe and stock air box which I'd like to keep.
The carbs I'm assuming are stock, I haven't opened them up since buying it end of last summer. past two previous owners just kept it clean in their collections.
So what I was thinking to do was to put it the #95 main jets and maybe a richer pilot jet? next pilot jet size is #38.