Sorry, reread your post, the mechanic did rejet. Some Triumph dealers and indie shops readjust the carbs after new exhaust and jets. They use an oxygen sensor and adjust the air mixture screws making the bike run lean, sometimes causing popping also. Use Blue Job and turn your screws out i/2 turn.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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