The 20 - 80 usable RPM rule

[imdying]

I beat the absolute crap out of an FXR, red lined it in every gear all day every day, never managed to kill it though.

[Dodger]

I have a 50cc scooter here with a Tachometer, why?! The thing wont do 60kph without it sitting at the high end of the redline.
I think it's more for show

[thehollowmen]

I thought "whoa I must be labouring the engine" because of shuddering, but I worked it out by riding today. I'm doing about 40-80% because of a factory installed flat spot between 3-4k RPM for emissions.

I'd like to go lower, then I'd gear it up, better sort out that flat spot then.