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Alvaro :
My 250 rolls easily on idle because she is very light but more importantly, the 1K rpm speed in 1st is very probably pretty low compared to your bigger engined bike.
So that is not really relevant.
My conception of lugging is really focused on my bike : if I ride it slower than 50 kms/hour in 5th (yes, those small engines are geared very low), she doesnt like it at all but to be honest, i'd rather stay at 50 km/h in 5th rather than drop down a gear to have her happier (and closer to the torque peak).
It is all very confusing for me because when the throttle is lightly opened, the pumping losses are very high (yes losses, that doesnt sound efficient at all) and yet we want to be in the higher gears (=> with small openings) as much as possible.
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