For those who appreciate the skill & effort involved in pushing the envelope. I bought an Aprilia SR50R with the specific intention of improving the feeble engine to decent street/race level performance.
I'm away on business so today my mechanic posted this video to show me the progress. It's nearly ready...
Spoiler alert: at 1:40 the tortured tyre gives up - popping rubber on a 50cc scooter is a rare achievement.
(Edited to add spoiler alert)