Air is pulled into the crankcase from the PCV (positive crankcase valve) the fresh air enters through this filter to keep dirt from being sucked into the crankcase. This filter is usually located inside the air filter housing.
there is no drain for the crankcase, after changing oil in the tank, you have to run the engine with the oil filter inlet line or the return line at the tank (low pressure) disconnected and run into a drain pan, the engine will maintain oil pressure internally, after the oil flow changes from dirty to clean at the filter inlet or tank line, shut off engine, install new filter, connect hose at filter or return line at tank, top up oil to specs.
In crankcase filter box
That is the oil filter
no
The filter is in the carburetor inlet. there is no external filter on this car. It uses a small sintered bronze filter behind the carb inlet fitting.
Ussually a sign of "blow-by" or combustion gases blowing by the piston rings into the crankcase. The excess pressure is blown into the aircleaner via the PCV inlet hose. (Your engine is on its last legs)
That would be part of the crankcase ventilation system. I guess you could call it the air filter housing to engine crankcase ventilation tube.
The connection on top is from the filter inlet (discharge of the pump). The connection on the opposite side of this one is the filter outlet back to the pool. The connection below the filter inlet is for backwashing the filter.
Probably because you have a plugged inlet filter. All washers have this tiny filter inside the inlet hose. -Another possible reason is the electrically controlled inlet valve, it may fail .
The crankcase capacity of the 1987 Yamaha 350 is 2.5 quarts. 2.0 quarts will go into the crankcase and .05 quarts will go into the oil filter.
On the inlet line of carb.
right on the front of the engine crankcase.