Well my 1985 yamaha xt600 is blowing bits of black smoke in the morning is that bad?
SOURCE: running rich and blowing black smoke
Could be a number of different things.Fuel pressure relief valve not working,injector pulse too long,Is the air box lid securely fastened and air cleaner clean.Are there no leaks between the air box and throttle body(intake tube).Have you checked oxy sensor.air flow meter may be also possible.Try squeezing the flexible fuel hose enough to allow the engine to run and see if the engine reacts better if it does you have excessive fuel pressure.
SOURCE: blowing oil and smoke
When overfilled, how long before the level was drained back to normal, or was it? The problem with overfilling, is that the oil will 'foam' and not lubricate properly. This can result in serious engine damage. So, make sure it's at the proper level now, if it is, I believe the engine was damaged due to lack of proper lubrication. Wish I had better news. Good luck.
SOURCE: 1985 f250 with a 460 gas motor blows blue/white
Blue --is Oil
White- is Coolant
Bad intake gasket or head basket
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