like harley, and probably others, they cannot tune the engine correctly or they violate epa. harley has had the same trick for years.
lower engine rpm for the drive by test. this is done without considering the engine luggs hard in high gear at highway speed.
retard timing at cruise to build heat in exhaust to supplement the cat converters.
lean tuning to less than stoich
add funny plastic wing thingy under the boys to keep from scorching
shut down rear cylinder and call it "parade mode" no joke!
tell customer "they all do that"
tell customer warranty will be voided if customer corrects problem.
finally, they are getting liquid cooling effective.
motorcyclists cant say balls? wow