Can anyone tell me what these two ports do on the HIF? As you can see I have the upper one blocked and the lower one (float bowl vent??) runs to my charcoal canister.

Is blocking the top port wrong or ok?

Thanks, M

Just checked mine and my top one runs to my breathers and the other one is open to the air . Been running like that for years and no issues...

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Respect mine and I'll respect yours.

The one you have blocked off is for engine breathers but it`s not really a good thing,,, i`d leave it blocked off,,, the one with the hose attached is the float bowl breather

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Thanks Matt!

Now you've told me I do remember that being connected to the breathers and constantly sucking in oily air.

M