I picked up a '85 720 last fall, and just started digging into it. It ran when I picked it up, drive it home. Rather gutless (max about 45mph), pretty significant engine vibration on start, and ran pretty hot (even with topped off radiator) - lots of cracked vacuum lines, very poorly tuned carb (previous owner had no idea what he was doing and cranked on various knobs randomly) - so there are a lot of opportunities for improvement.
I did some digging and came to the conclusion the head gasket was *likely* blown, but failed to do a compression test before tearing in - I definitely should have done that first, and would in retrospect.
Regardless, I pulled the head off and snapped some photos. It appears that #4 is the problem child here, but I'm not having much luck identifying exactly what is going on in that cylinder, specifically the build up on the exhaust valve. I _think_ from what I can find via the google is that I'm burning some coolant in that cylinder, but thought I'd post a few photos in here in case someone with more experience that I do knows exactly whats going on.
Next up, I have a machine shop where I'll be dropping the head off to machine it, do new valves, etc, as I don't have the equipment necessary - and I definitely trust this shop more than my garage.
FWIW the #2 and #3 cylinder look really good from what I can see, I'm reticent to spin the crank to check #1 and #4 without pulling the whole front off and dealing with the timing chain - any tricks there that I don't know about? Thanks!
-Badger
