Standard ear air intake question? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 25 (permalink) Old 05-08-2009, 02:24 PM Thread Starter
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Standard ear air intake question?

I am in the UK although the bike is still fitted with the US emissions reed valve system.

When I open my ears at the initial air intake there is a square rubber hose that bends at 90 degrees and ends just over the edge of the top of the filter element.

When I look in my 3 different manuals this part is not shown (what is shown is a simple square rubber grommet that just covers the square intake hole cut out of the back of the ear).

In all of the pictures I have seen of open ears I have only ever seen the simple square finishing grommet or just the bare square hole.

So, has anyone else seen the parts I'm talking about?

I was thinking that people might be removing them as they obviously cut down the airflow into the ear.

The part is definitely made for the bike but I was just interested as I've never seen them anywhere else and none of the manuals seem to show them.

Cheers, Trace.
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post #2 of 25 (permalink) Old 05-08-2009, 02:45 PM
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Have you checked the online manual here?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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post #3 of 25 (permalink) Old 05-08-2009, 02:52 PM
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Part information

Trace, I haven't seen that part before, but it sounds like you have a California/Switzerland model bike. The California/Switzerland bikes have some extra emissions parts. At the base of your fuel tank (under the lip of the seat) do you have two vents? If so, then you have the one of those models. That part is shown in the Clymers manual in diagram 75 on page 272, part number 15. It's labeled simply "Fitting (California and Switzerland only).

The manual on Ron Ayers site shows it as part # 92071A. Is that the part you're looking for? Take a look at the service manual page here (top left quadrant of pic, zoom in and it's inside a box):

http://fiche.ronayers.com/Index.cfm/...r_Cleaner(1/2)
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post #4 of 25 (permalink) Old 05-08-2009, 04:28 PM Thread Starter
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No the part I'm talking about is instead of #14703C on the main part of the ear.

Thanks for putting up the link it makes it a lot easier to explain what I'm talking about.

Cheers, Trace.
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post #5 of 25 (permalink) Old 05-08-2009, 05:12 PM
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Huh. Weird. I've never even heard of something like that then. Sorry Trace.

Bookmark that site though, those diagrams and part numbers come in real handy.
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post #6 of 25 (permalink) Old 05-10-2009, 09:21 PM Thread Starter
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Interesting, I took some measurements today and the unusual intake duct grommet/square rubber tubes on my bike cut down the air intake duct size by nearly exactly half.

I'm gonna take some pics of these so you can see them.

When I've got more time I'm gonna have to check the size of main jet in the carbs (removed the rubbers and definite fuel starvation when main jet takes over).

Bike goes like a train (I've seen just over 120mph on the speedo twice) but this is still an obvious air restriction (the parts are definitely made for the bike).

I find it interesting that with the many people that have viewed this thread and checking all the manuals and parts fiches I can find that nobody else seems to know about these parts.

Cheers, Trace.
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post #7 of 25 (permalink) Old 05-11-2009, 08:36 AM
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Hi Trace. If you are on the look out for standard parts let me know. I'm going to look at a scrap 750 and possibly a 700 at the weekend (my petrol cap got crow-barred) If the air filters are still with the bikes I could get a price for you. I'm in the UK so postage wouldn't be much.

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post #8 of 25 (permalink) Old 05-14-2009, 08:08 PM Thread Starter
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Hi Retro,

I maybe interested in both of the 750 wheels but don't need them, it would have to be at rock bottom price as there is absolutely NO demand here for them.

But if they want some cash with no hassle quick, then I may make an offer.

Cheers, Trace.
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post #9 of 25 (permalink) Old 05-14-2009, 10:50 PM
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Quote:
Originally Posted by Trace View Post
I find it interesting that with the many people that have viewed this thread and checking all the manuals and parts fiches I can find that nobody else seems to know about these parts.

Cheers, Trace.


My guess, unless you bought the bike new, is that someone replaced the stock grommet with the odd one you found. Guessing there ie one on both airboxes?

You did not mention the year either, but Kawasaki does not substitute parts without making note of it somewhere.

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post #10 of 25 (permalink) Old 05-15-2009, 12:08 AM
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didn't some of the euro models come with smaller main jets therefore the smaller air intake also .I am thinking out loud here all the intake rubber grommets going into the surge tank I have seen were oblong,Now I am confused that is the grommet we are looking at, correct? IGNORE THIS POST I WAS LOOKING AT THE WRONG END OF THE AIR FILTER HOUSING ,I really don't know I threw all that crap off mine in favor of K&N's Before I rode it.




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Last edited by denny6006; 05-15-2009 at 12:12 AM.
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