poor power and backfiring

[Brads Brown wing]

Hello folks, I had the opportunity to buy my old bike back after 3 years, It didn`t start so I benched it and started looking, It was outside for a cpl. years under a tarp, so first off brought it in the shop to dry out. It would barely idle with the choke out but wouldn`t run and would pop and backfire, so first off I took out the carbs for a cleaning, Found lots of gunk so I used a guitar string and cleaned the jets and put it together, first time but it seemed to go well. Since I was in there I ordered a cpl. coils and new wires with throttle cables, got it together and much to my surprise after a few cranks started right up. Problem now is a lack of smooth throttle operation and still backfiring, so I`m in the process of checking the valve clearance, ran into an issue with the oil plug, they stripped it and now I need to touch that up before firing. Any other ideas as to why it would start perfect but run poorly?

[biguns]

Check the igniters under the tank, you will have to remove the tank to see them on the left side 2 of them, usually they lose their potting from getting hot, doesn't necessarily mean they are bad but worth looking at , should be a testing procedure in the manual or here on the forums how to.
Check for chaffed or shorted wires as well.

[Brads Brown wing]

Thanks, I`m a little lost as to igniters, I did the coils , spark plug wires and set the valves, seems to be running fairly well ,but theres a few holes in the exhaust that need some attention, so I`ll get to them, right now I`ve got brake issues,lol. Guess when it sits outside for a cpl.4 years under a tarp they don`t fair well