1.) I believe you are referring to the crankcase breather which comes off the valve cover. If so on the yerf dog the breather hose just vents to atmosphere. If you are blowing oil out the hose it is caused either by overfilled crank case which will stop after excess blows out or you have blow by which is caused by worn or improperly installed rings.
2.) This hose is both a drain and also an overflow hose. Leaking will be caused by either a loose drain screw or in some cases a bad o-ring on drain screw, some have an o-ring and some don't. Or the carb is flooding due to dirt in float bowl, sticky or bad float, leaking needle seat. Pull the carb and give it a good cleaning.
3.) This is a breather tube for the final drive and like the engine vent , vents to atmosphere.
4.) Not sure what you are referring to air strainer for front of crankcase. The shrouds I can get for you. You can give me a call 662-301-1563 and I can get you everything needed.
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