After firing, runs crummy low throttle

[Condor87]

Hello, sorry to post this as I see many familiar threads but none with the exact issues as im having. I have a 99 kat 750, and recently it has been popping(after fire?) out of the exhaust A LOT, also seems to be a little bogy/stumbles and seems to be the reason for the pops when I am cruising with maybe 5% or under throttle.. It idles fine, if i give it some gas it goes good and runs fine, but with very light throttle and cruising it runs kinda crappy.
I changed the spark plugs and noticed that cylinder 3s plug was black, but all the others were fine.. changed the plugs and checked again 3 days after and same thing.
Also getting a slight gas smell from the air box when i checked the air filter.
The issue came out of no where, it wasnt like a gradual thing..one day it was running awesome then the next, this.
Thats about all the info I can think of to give..
If anyone can try to lead me in the right direction I would greatly appreciate it.

[arsenic]

Have you adjusted the A/F screws to 2.5 turns out? Have you added a full exhaust without adjusting the jetting? Both of those will cause that issue.

[Condor87]

No sir, havent changed anything

[arsenic]

See that part about adjusting the A/F screws to 2.5 turns out? Do that.

[Condor87]

ok, ill give it a go. thank you!

[Kreylyn]

While your in there, check your emulsion tubes for wear.

Krey

[arsenic]

The 98+ Katanas are a different animal when it comes to that. Don't confuse the pro lad.