My VBB2T starts to detonate when I drive 75-80km/h or more.
I checked my ignition which is 28° TDC, point gap 0.35mm, sparkplug L86C (=NGK B6HS).
Tried with colder sparkplug L82C
Would it help to change main jet to higher type (102-104)?
Sparkplug is light brown, would like it to be bit darker.