I used to ride a motorcycle many years ago - back in the early 80's.
I had a Kawasaki KZ550. That bike was a beast. A brother in another congo had a business servicing, repairing and selling bikes. I always had my bike serviced at his business. The one time he put 'racing' sparkplugs in my bike - scary as hell.
Good times. I miss them.
PS; When I accelerated the bike, my GF / now my wife, squeezed tighter - 'evil grin'.