First of all, sorry for a dumb question like this.
I've googled for a long time but I still can't figure out,
which range of RPM i should use.
I know that higher RPM will have better efficiency ,
but at which point, our CBR250R will have a break-even milliage? (low vs mid vs high RPM)
I usually ride at 3.5k RPM and shifts at 4.5K RPM.
is it too low revs, and will such revs damage the engine? (both short and long term)
Please forgive my poor english, non-native speaker (I am trying my best