what determines when should bore and engine
You can, but you should find a big bore kit to do it. But if you are really looking for more speed and power, you should get a bigger scooter.
because if we do not care your ears your ears will be dirty
should i be worried about this bump at the corner of my right ears?
Use full bore for applications where pressure drop should be minimum (such as in the suction pipe of a pump with required NPSH very close to available NPSH), or for pipes which could be cleaned with a pig (so that the pig doesn't get stuck on the valve). In other applications a reduced bore should be OK.
as long as you get no die in your ears you will be fine(:
Why not, Sophie needs some bling in her ears any way.
You should get your ears tested at a hospital by a professional.
Flying with blocked ears is not necessarily dangerous. However, you want to find out why your ears are blocked before you fly.
You should be able to see the grain in a wooden clarinet, and the bore is a term used to describe the inside of the clarinet.
of course you do
Ears really don't have dangerous veins. You should be fine piercing anywhere on your ears.