Stihl FS 130R trimmer lost compression

[Newdave]

My Stihl FS130R trimmer has lost compression, I suspect it is a problem with one of the valves due to the sudden nature of the failure. This is my first two stroke engine with intake and exhaust valves so my hope is someone here has a repair manual or suggestions / advice on valve adjustment or ?

 

[Newdave]

Problem solved with the help of Steve's small engine saloon, very easy to adjust valves and wow what an improvement in performance.