Breather question

I did not build the engine. Hope this picture tells the story. There is no right angle fitting. But a blue anodized bolt.


Here is what I think is the relocated breather connection.



And here is what I think was the chain oiler.



The head is an RH6C. And the gas tank has hand painted 'Norris Norton' on it. Like I said in an earlier post the bike is very fast. Maybe the PO tried to mimic the combat engine. But do these photos back up what you all have said?

sole survivor said:

But do these photos back up what you all have said?

Click to expand...

Sort of at least to me. I still don't know where the hoses are going, but that's not unusual to put the breather off the timing side 'magneto port'. There may or may not be a one way valve off that magneto port to the oil tank or to the air, but usually it's put in there to make lower pressure in the engine than in the air, which helps stop leakage from seals in the engine. If I were you, I'd figure out how the breather is plumbed so you know what's going on, and I find it best not to drip oil off an unblanked hose because it always seems to find it's way to your bike somewhere.

That said, I did remove the oil tank breather from mine that went to the air box and fed it to a catch bottle that resides between the gearbox and the engine. It's a rare day when I have to remove oil from that pill bottle, but it's better than when it went into the airbox and then dripped down on top of the gearbox and further down on the engine and back on the rest of the bike when it was going down the road.



There are more elegant solutions to the problem, if it's a problem for you.

Dave

The chain oiler hose connects to the oil tank on the back side above the large banjo bolt. The oil tank has a metal tube that is split into a tee. One leg of the tee accepts the return from the crankcase (scavenge side of oil pump) and the other provides oil to the chain. It is very common for this to be plugged.

There is also a hose that typically goes from the top of the tank to the airbox.

Russ

rvich said:

The chain oiler hose connects to the oil tank on the back side above the large banjo bolt. The oil tank has a metal tube that is split into a tee. One leg of the tee accepts the return from the crankcase (scavenge side of oil pump) and the other provides oil to the chain. It is very common for this to be plugged.

There is also a hose that typically goes from the top of the tank to the airbox.

Russ

Click to expand...

This is exactly how mine is connected. Or disconnected. Both, the relocated breather and the chain oiler use the same split T connection on the oil tank.
Just wondering if that is enough 'breathing' to bleed off all that internal pressure. And the thin tube at the top of the oil tank is still connected to the air clearner backing plate. And in my picture you can see I have removed the air cleaner assembly. After each ride there may be some residual oil that has dropped out but never enough drip to the ground. I'll check that small hose to see if there is any blockage. So maybe, in a roundabout way, the unused area in the oil tank(below the oil level indicator on the dipstick) is enough of a breather to pass through any built up pressure.