Today, outside temperature 6-8 degrees, on my commuting trip I took some special notice on the 5000rpm surge.... there was none... smooth as ....whatever. So my impression is that it seems to be related to outside temperature.

Again: it's not a problem ... it's behaviour.... call it character.... buy a inline 4 if you want smoothness (or an electric scooter!).

HJ

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Riding the Mad Mule !! ... no more... went orange...