curious about holes in exhaust port area of head - Honda Motorcycles - FireBlades.org
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post #1 of 7 Old 03-21-2014, 11:08 AM Thread Starter
 
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curious about holes in exhaust port area of head

On a 954 does anyone know the purpose of the other small holes in the exhaust ports? They are right next to the second exhaust valve guide of every cylinder.
Haven't had a chance to investigate where they map to where the head meets the block but they do have a hole that comes out on the block matching side of the head.
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post #2 of 7 Old 03-21-2014, 12:16 PM
 
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Re: curious about holes in exhaust port area of head

can you post a picture of it?
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post #3 of 7 Old 03-21-2014, 12:23 PM Thread Starter
 
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Re: curious about holes in exhaust port area of head

yea... at work so don't have a pic. sorry.
But if you were looking through the exhaust side header hole into the head you would see to the upper right of where the valve guide is(or left depending on which cylinder), a small sorta rectangular shaped cut out. That recessed cutout goes back into the head and comes out as about a 1/4inch round hole where the head meets the block. In their dirty state.. it's hard to think of them as anything more than just a funky cutout in the aluminum.
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post #4 of 7 Old 03-21-2014, 1:51 PM
 
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Re: curious about holes in exhaust port area of head

Pair valve holes where fresh air is added to the exhaust for emissions regulations.

SOLD: 03 CBR954
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post #5 of 7 Old 03-21-2014, 5:24 PM
 
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Re: curious about holes in exhaust port area of head

Assuming you're talking about the ones below the exhaust port/manifold they are for drainage of the spark plug 'hole'.

Just checked as I have my head on the bench!
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post #6 of 7 Old 03-21-2014, 5:26 PM
 
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Re: curious about holes in exhaust port area of head

Sorry, just read your second post... Ignore my stupidity!
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post #7 of 7 Old 03-21-2014, 5:27 PM Thread Starter
 
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Re: curious about holes in exhaust port area of head

def not the sparky drain holes. Those are on the outside and smaller. : )
I think the Doc has it right. I'll have to go look where the block side of those holes go now.
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