Last time I was out on the 1954 Velocette MAC it was pitifully slow, and uphill it really struggled. Being overtaken by Welch on an MZ 150 was the last straw.
A compression test revealed all of 50psi. Valve clearances aren't tight, so apart it came.
Popped the valves out of the head.
Need to pop the piston off the conrod and check wear and ring gaps in the barrel
So I reckon a top end tidy up and some new rings and we'll be back in MZ beating business.