Nice bikes you have.
I personally prefer the older ones, where even riding with 90 km/h feels dangerous.
My first big bike, a "Jawa 500 OHC" from 1954. On my first long ride on a vintage ralley (800km) the engine shaked so much that I lost a 13cm long bolt from the engine attachment and couldn't even hold an empty glass in my hand.
Jawa-500-4.JPG
But now after a new balancing of the crankshaft it feels really nice to ride that twin-engine.
At the moment I restore a "NSU 501T" from 1929. It's a 500ccm one-cylinder 4-stroke engine.
PICT0044.JPG
I hope it will be ready next year. Some parts look really horrible.