checked your valves recently?
the PSI checking is the same for cars. to confirm compression try a bit of oil in the cyl and see if there is a difference!
the TT are having their first eco race called TTXGP
looks sorta cool and does 150mph
Norton are pitching in with the wankel engines beast the Norton NRV588 Rotary Racer for the manx GP
I used to use cornflake packets for gasketv material. lighly oil the part, press it on the card and you have an impression. Cut around it and viola!! C'est Bon