Backfiring... Check the spark plug to see if she is running right mix wise. Couldn't tell in the picture but does your muffler have the spark arrestor still? Most of them seem to have lost them with age, if it does have it pull it out and clean it and then start it up without the arrestor and rev it up a few times and blow the carbon and crap out of the muffler. I would also check the valve adjustments as well.
Very clean looking trike, i would have paid good money for that!
Oh for the headlights... They aren't very bright, i added a couple 27w LED lights to mine in place of the high beam, makes a huge difference and only draws as much as the high beam element in the stock bulb used to, no need for electrical upgrade!
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....