gearing

I have a 2022 cbr605r (UK) and I haven't used it in a couple weeks and now it has developed a random issue, which I don't seem to be able to resolve. No matter what gear I'm in ( and all gears work just fine ) the neutral green N on the dash flashes on and off repeatedly and the gear indicator...

What is the fastest speed in first gear I can go before shifting into second gear?

Bike; Cbr650f 2015 (unrestricted) So the title says it all really. I am just hoping to get some thoughts on this change just before I do it. I have had friends tell me ooo that's a big jump and one that claims to be a bike "god" ... says even just 2 on the rear would make a world of difference...

Hi! Has anyone here tried changing the front sprocket on a cbr650f from stock 15t, to 16t or 17t? Reason Im thinking about doing it is for highway comfort. The bike vibrates quite a lot after 4800 rpm and at that point Im at a speed of only 100 kmh (62 mph). I would like to move this rpm to...