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Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
Get some emory cloth like plumbers use and clean up your bars under the grip. My son just installed a set of Avons and had the exact issue. Don't use grease on the bars, it will only gum things up as it collects dirt.
I just installed avons on mine last week and had the same problem. Turned out the grip was binding on the end of handle bar. Avons are a little shorter than stock grips. Loosen the 4 screws on on your switch assembly and move it out towards the end of handle bar, that should cure your problem.
Adjust the throttle and idle cables. Might as well lube them while you are in there too.
+100
Make sure you adjust it per the manual too. What may work great with the bars pointed straight ahead may not work very well with the bars turned to the far right.