That Puch split single brings back memories Ian,an EMC Puch was the first racing motorcycle I rode in the late 50s.
Not very quick and in trying to make it faster it devoured pistons.
What I remember of it, it had twin Amal carbs,1 each side and twin megaphones, later changed these for expansion chambers.
Only thing I liked about it was it had a most perculiar shaped like a kidney bean alloy tank. I virtually gave it away around 1962 wonder what it would be worth now?