dont aplogize. just dont expect me to pay for the online tutoring:). so moto, would you say idealy, given allowing chassis dimensions, would a vertical spark plug be better? im assuming the only time when an angled plug would be better/practical is if there were 2 plugs in 1 cylinder.

curiosity sometimes eats at me.

I would say straight and centered in the combustion chamber is best unless testing dictates otherwise on a particular engine.