Small hole sachs 505 cylinder head

I just got this Columbia with a sachs 505/1a running, and I noticed there is a little hole on the bottom of the head. It seems to be a little bit of oil and exhaust coming out of it, is this normal?

Re: Small hole sachs 505 cylinder head

It's the outlet for the decompressor valve. If your seeing smoke then the valve is leaking. You can replace it with a m10 1.5X20 bolt to bypass the decompression function and stop the leak.

Re: Small hole sachs 505 cylinder head

Cool thanks, I didn't think it was right.

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