The 4th. shot looked very much like a Villiers-engined Motor Bike, but a quick browse through the Villiers catalogue showed otherwise.
(The design of the engine is very similar to the 225cc, twin-port, two-stroke engine).
The Villiers two-stroke engines, (in common with most British Bikes), has the Kickstart and gear-change levers on the right-hand side of the Bike. (The rear brake lever was always on the left).
Excellent shots, Omag, I've saved them in my photo album...

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F....brmmm...brmmm.... 8-)...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.