what max RPM on low comp 273

and what kinda timing do you have?
Do the 904s have some kind of governor?
What town are you in? My family and I are from Hallstadt next to Bamberg (more central Germany)

cannot really tell, what timing (have to figure it out exactly with a light-gun) i guess somewhat about 10 or so...

i´m coming from Nördlingen - it´s a small town in Bavaria - about 170 km far from Hallstadt