XT600 running issues

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Hey guys XT600 1989 kick start

Finally i've been able to ride bike, put about 80 miles on. More questions.
Previous i had a problem with a surge around 3k-4k, switched out with another carb i had (also busted secondary jet). This carb worked better, not perfect but improvement. I think my surge/stumble comes from the make shift on the jet fix. I also have the secondary carb coming on slightly earlier on 2nd carb.

I am running I think a 38 tooth sprocket. Feels way to high geared with this set up. problem is i can't remember what the stock set up felt like (ages ago). Is anybody running this smaller rear sprocket? Feels like i will laboring the engine in 5th. I know this is an issue with oil to the gear box so I'm thinking this is a bad set up. But I am still sorting out the carbs so perhaps its not producing the power it should.
Both carbs run pretty similar power wise.

Also Battery/stator question
The battery is dead at moment probably junk at this point.
When the bike is running I still have weak lights, at times i have no directional or tail light. When I hook up to charger they work fine.
I thought the stator would power them all up good. Now the batt is dead and when running there is light just week. The battery did previously take a charger from the batt charger.
Could this be a stator issue?

Also the decompression cable is kaput. Now I know what it feels like to TRY and start without........ humiliating
I think this cable wasn't right from beginning
Anyone ordered one lately and know if there are other options? Ebay was empty.
Thanks
Greg