Hello,
My 1961 650 has the engine breather on the rear left of the crankcase.
When i built it in 1998?! as a spotty youth I originally initially routed it to the front of the chainguard. Very messy first rides!!
Then I routed it to the front of the oil tank (no froth tower), and the "second breather" on the oil tank to the chainguard. Messy again! But this time from the pressurised oil tank blowing out past the cap. And a bit at the chainguard.
Finally I put a T piece just in front of the oil tank. The "straight line" of the T goes to the tank, with the 90 degree part pointing up, then arching across the frame under the seat, and out to the ground on the LHS. This allows the engine to return oil to the tank, but oily air goes "up and over", breathing out the breather. I guess it's like a not very effective oil separator based on gravity as oil is heavier than air.
Will post a pic when home....
Anyway, it seems to work ok. No pressurised oil tank, *no leaks* from the motor (actually, none. Dry, like a modern-ish!) Just a little drip from the (atmosphere-breathing) breather when I park up after a hard ride.
So I am thinking of putting a little catch tank in (like the 750) and just empty it every week or 2.
I wanted to ask what it *should* be from factory. And what do others do??
Finally, do you think a PCV would help me? There seems to be a goodly amount of oil thrown out the back of the cases, but my T piece oil separator system means this mostly returned to the tank. Would a PCV not struggle with the oil? And would i not still need an "additional" breather from my t piece? I get the benefit of negative pressure in the crankcase to stop oil leaks, but I have no oil leaks to cure....
Thoughts? Would a pcv mean that I breathe less oil??
Cheers!
Andy
My 1961 650 has the engine breather on the rear left of the crankcase.
When i built it in 1998?! as a spotty youth I originally initially routed it to the front of the chainguard. Very messy first rides!!
Then I routed it to the front of the oil tank (no froth tower), and the "second breather" on the oil tank to the chainguard. Messy again! But this time from the pressurised oil tank blowing out past the cap. And a bit at the chainguard.
Finally I put a T piece just in front of the oil tank. The "straight line" of the T goes to the tank, with the 90 degree part pointing up, then arching across the frame under the seat, and out to the ground on the LHS. This allows the engine to return oil to the tank, but oily air goes "up and over", breathing out the breather. I guess it's like a not very effective oil separator based on gravity as oil is heavier than air.
Will post a pic when home....
Anyway, it seems to work ok. No pressurised oil tank, *no leaks* from the motor (actually, none. Dry, like a modern-ish!) Just a little drip from the (atmosphere-breathing) breather when I park up after a hard ride.
So I am thinking of putting a little catch tank in (like the 750) and just empty it every week or 2.
I wanted to ask what it *should* be from factory. And what do others do??
Finally, do you think a PCV would help me? There seems to be a goodly amount of oil thrown out the back of the cases, but my T piece oil separator system means this mostly returned to the tank. Would a PCV not struggle with the oil? And would i not still need an "additional" breather from my t piece? I get the benefit of negative pressure in the crankcase to stop oil leaks, but I have no oil leaks to cure....
Thoughts? Would a pcv mean that I breathe less oil??
Cheers!
Andy
