Discount exhaust leaks, jetting, and fuel pump to start.I get backfireing on both acceleration and deceleration only in the rear cylinder at at only between 1800 and 2000 rpm. Checked for exhaust leaks Proper jetting electrical malfunctions fuel pump and delivery problems. Any Ideas what this could be?
My guess would be that something is causing your rear cyl to run lean, but since your plugs look good it's gotta be intermittent-- or if only at those rpms it's in that carb most likely, but I'm too new to Hondas. Anything else I might say wouldn't necessarily be helpful. Good luck. Wish I were more help.All four plugs are light tan. Air mixture is three turns out (It has Cobra Pipes and a jet Kit).