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 Honda BF 75 exhaust		  New Topic  Topic Locked
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D Wrate
1st Mate

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38 Posts
Initially Posted - 07/16/2004 :  13:55:05  Show Profile  Visit D Wrate's Homepage
I was checking the idle speed on the above on the weekend and noticed something which struck me as odd.

On the rear of the leg about 6" down from the bottom of the cowling there are two holes which emit exhaust when running. When I plugged thses holes the exhaust then came out under the water as it immediately started bubbling up.

Is this normal? I would have thought that the exhaust would have always been directed under the water.

David

S/V Cindino
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 07/16/2004 :  15:05:04  Show Profile
As I (vaugely) recall from my BF 75, I think that's normal. they are exhaust relief holes to reduce backpressure on idle.
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lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts
Response Posted - 07/17/2004 :  00:50:58  Show Profile
Clam Beach is exactly right. Those little holes are also placed where they are to release exhaust above the waterline when you have the motor in reverse, so the prop doesn't cavitate in it's own exhaust bubbles. Yamaha solves the cavitation in reverse problem by having a forward-facing exhaust port annulus built in to the propeller itself.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.