Re: M25 what is this and where does the hose go?
On our M25, we simply routed the breather hose down to a peanut butter jar, drilled a hole for the hose and then a bunch more smaller ones to vent it. Any oil drops into the jar with full atmospheric pressure all around. Simple.
Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)