Thanks for that. How many turns out onthe needle due you consider rich enough?
You can start at 4 turns out or more. There might be a change there if you have to pinch almost continually like in the first 2 tanks. The piped motors behave a little different than the muffler motors. The muffler motors can start whats called a "run-away" where the piped motors wont.
The "run-away" is when the whole o/b builds enough heat that it will quickly digest all that extra fuel you've been giving it and turn into a self feedin' demon. Of course it happens when you have the pinch off but stay calm and choke the carb slightly ,(I use a brushing motion with the back of my finger) and the R's will fall back down. This usually happens with the last 3 tanks and would require a click or two richer.
Be advised the entire o/b will get fairly hot. This is the advantage of semi-breaking-in an o/b. All that extra metal hangin down there acts as a great heat sink.
The other method, put the whole works on the water rich and run, run, run it in. Still a great method no doubt,, have broke-in many successful powerheads that way. But in recent years I've had several customer o/b's to build and never really trusted most of them to actually finish a solid break-in. Many just don't understand how important this process is.
dub