My friend bought the 860 bbk, drop-in cams, Mav heads (also one of your transmissions-not the point of this thread though) this year and finally got everything finished. He cranked it up and let it warm up for about 2 minutes then rode around his property. Varying rpm's in low gear for about 10 minutes. He noticed steam/vapor coming from the crankcase vent hose but figured it may be condensation in the engine. The next day, same thing...cranked and let warm up for about 1-2 minutes then rode for about 10 minutes in low gear. Noticed the same steam/vapor from the crankcase vent hose. It's not high pressure and doesn't seem to "puff puff" with the piston strokes... what do you think?
Btw, compression was 120 front and 121 rear, leakdown was about 30% (on a cold engine).
He took a short video but the attachment choices on this site only seem to allow pictures or gifs.
Btw, compression was 120 front and 121 rear, leakdown was about 30% (on a cold engine).
He took a short video but the attachment choices on this site only seem to allow pictures or gifs.



