I don't have an exhaust on my 86 but I did a Cobra on the 85 200X.
I didn't buy a jet kit or go one step at a time, I just tried the following...
I raise the needle by dropping the clip one notch. I played with the airscrew a bit until it idled well and took off from a dead stop smooth. Inside I removed the 2 jets and found which drill size (1-60) fit well in the orifice. Then I used the next drill size up or about .002 thousandths larger and I drilled them out.
Then I rode it....
I could feel the bogging on the top, hard to describe but you'll feel it. I yanked the main and drilled it another size up and rode it. By the third time I felt it was spot on.
It is also a must to remove that airbox lid or put massive holes in it.
Anyone can add there 2 cents but that 200X ran like an SOB all through the gears. I sold to my best bud and he rides it every single day and that thing starts first kick hot or cold, never spudders and idles/runs perfect. It runs like a champ....
I did the same procedure on my 85 250SX when I built the motor and it also runs perfect.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country