As above guys.
My loverly 'new' 160 had started to feel a little underwhelmed over the last few gallons so
I did the obvious took the rocker cover off to adjust the tappets and found the inlet valve
spring broken. I ordered a new one from Probuild fitted it, adjusted the tappets and took
her flying again. She still feels a little lack lustre any ideas where to look next Gents?