For me it was back in 1981, after a pillion ride on a mates Honda CB250RS.
Up till that point I'd never even given bikes a second look.
I was 18,
I just thought WOW, this is for me.
I was going to buy a moped, but the old man in the bike shop persuaded me to buy a "proper" motorbike.
I got a Kawasaki KC100, little 2 stroke single, which I shortly afterwards ran into the back of a parked Volvo.
I was not a natural.
I've ridden ever since, without a break.
I owe a lot ot that wise old Man at the bike shop, who guided me in the right direction,
The shop itself is still there, and owned by the same family.
Last Summer I was back up that way, I took a photo of it with my bike parked outside.
Happy memories.

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