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.
In crankcase filter box
That is the oil filter
no
There is a fuse for the "air" filter?!
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 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.
right on the front of the engine crankcase.
top center of engine under/behind air filter housing
5.2 quarts in the crankcase including filter
Crankcase breather tube.
its hiden under the air filter you have to take alot of stuff off if its a 351 ford