What compression do you get on your GS ?

[Tom R]

Maybe the cam timing is off on the engine.... could explain higher compression and lack of power.

[ukjules]

When I start pulling it to bits I'll check that
as I work down. Yes cam timing is a mistake
that could have happened . An idiot mistake but
I can admit that at that time it is possible
All cylinders effected
at the same mad increase when logically they
should be lower. not much else can do that !
with what I used (pistons and rings )(nothing fancy and lapped the valves
myself)

i Will forensically pull apart and check clearances.
That will be weeks away mind but the answer must be known.