Join Date: Sep 2016
Location: Champasak province, Lao P.D.R.
Higher rev's aren't bad for an engine.
The problem with the 390's is the valve springs that can't keep up.
I have to be honest and tell you that I have no idea what a boosterplug is but unless trying it, I won't render it "better"
The PowerTRONIC regulates AFR as well as ignition pretty or retard.
As long as you are happy with what you ride.
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