Oil change then it leaks!

[Stu55Flash]

I was really pleased with my plunger flash until I changed the oil from Commer SAE30 to SAE40 no leaks before then blowing out the breather over the rear tyre.
 
Anyone else had this problem? Any ideas or should i just change the oil back again?

From here things got worse. She kicked back at me and I strained a tendon in my knee. Absolute agony! She is not happy with me.

Stu

[orabanda]

Stu,
Don't panic (yet!).

My tip is that you overfilled the tank (perhaps some oil left in the crankcases?), and the oil level has risen too high in the tank. If this happens, it WILL come out of the breather tube!.

Re-check the oil level; if it is too high (or even high), drain a bit out, and see how it goes.

Richard

[A10Boy]

I'm not familiar with the plunger oil tank level, but i've seen many restored SA A10's with the "oil Level" transfer fitted way too high, like up at the neck. They should be around 3 inches down from the cap. maybe worth checking on your bike?

[brackenfel]

I use Morris SAE40 in my s/a Flash with no ill effect so I wouldn't think it's the oil viscosity.. I've probably got it a bit too full at present as well but it still doesn't blow..

Hope you find the cause..
Adrian