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I am almost finished restoring my 1967 Honda CD125, and have a question about a "vacuum" port on the top of the valve cover. When I got the bike, there was no hose attached to it, and it acutally had a small mud-dobber's nest packed in the hole. I am guessing that there should be a hose coming off, but where does it go? Is it supposed to go down and disappear behind the engine?
Is this designed to release air/pressure as the oil pump pumps oil up into the sealed valve rocker assembly area?
If the line gets clogged (for ex., from an onwry mud-dobber), is there another way for the engine to release the pressure, or will oil oooz out someplace?
Thanks.
Pic of the vacuum port:
If you look at the top of the engine, you will see the small hole where I assume a hose should be attached:
Is this designed to release air/pressure as the oil pump pumps oil up into the sealed valve rocker assembly area?
If the line gets clogged (for ex., from an onwry mud-dobber), is there another way for the engine to release the pressure, or will oil oooz out someplace?
Thanks.
Pic of the vacuum port:
If you look at the top of the engine, you will see the small hole where I assume a hose should be attached:
