M33 Oil tank breather.

[John FD]

Recently I've replaced the semi home-made battery carrier on the M33 for a replica one from Draganfly. However, during the fitting process I noticed a pipe pointing downward from the base of the oil tank toward the top of the gearbox. I'd not noticed this before. Having consulted the words of wisdom I see this referred to as "pressure release pipe" which makes me think it's a breather. My parts book suggests there should be a rubber pipe fitted to this then a rigid but bent tube leading off somewhere to be clipped to the frame.

My questions are, where does this open pipe exit? Does it still point down? What I intend to do is to pop some flexible pipe onto the bare stub and run it roughly to where it should end up.

It may be that I've found the mysterious intermittent oil leak which I thought was coming from the gearbox. Possibly not.

[Ian C]

I can check tomorrow, but if I remember correctly, there should be a 'P' clip fitted to the lower chain guard to mudguard bolt which acts as a positioning guide for a rubber tube to be just over the rear chain. HTH

[John FD]

Thanks Ian. That makes sense. I'd apreciate it if you could take a look. In the usual course of events does much come out of that breather?

[Ian C]

A breather will have some oil vapours exiting John. Obviously don't have the oil level too high in tank as when you tip the bike over to left when trying to get the last fuel in the petrol tank over to the tap (don't ask me how I know!!) it'll leak out of breather pipe. I've attached a pic of my setup. BSA's idea was a steel pipe with a small length of rubber to connect to the tank, but mines all flexible pipe.

[John FD]

Thanks again. That photo is just what I need. The plan is to do the same as you with a length of flexible pipe.

[Mark Cook]

From notes that I have.

"Clip, Oil Pipe 66-8340 shown in original
wrapper. This is located on the inside of
the of the left hand engine/gearbox
plate."

Mark