What is it, and what does it do? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 02-16-2014, 08:39 PM Thread Starter
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What is it, and what does it do?

In what I believe is the TOC manual, Which is 2397, on page 334 (page E1130-0185), what is the function of part 16126, air switch valve and what does it do?

Edit: where do the hoses go as well?
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post #2 of 9 (permalink) Old 02-16-2014, 10:57 PM
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That's the gold colored air valve (suction valve) in front of the battery. Triggered by a vacuum line from the right side carb, it pulls exhaust gas from the reed valves on each head, through a pair if hoses, and sends that air into the air box. An emissions device, "clean air system".

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post #3 of 9 (permalink) Old 02-17-2014, 12:05 PM Thread Starter
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Are there any beneficial or detrimental effects from removing this part? Marble the Reed valves, close off the right side carb vacuum, remove the assembly, and plug the holes on the surge tank.

What can you tell me about how the bike will perform with this modification?
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post #4 of 9 (permalink) Old 02-17-2014, 12:24 PM
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https://www.vn750.com/Forum/Showthread.Php?T=1083

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post #5 of 9 (permalink) Old 02-17-2014, 12:24 PM
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What you are describing is a common mod, but many people just marble or use coasters and leave all the other stuff intact.

The mod primarily reduces after-firing (popping) in the exhaust, and tends to reduce exhaust pipe temperatures and discoloration. Air injection affects back pressure a tiny bit, but since the throttle is closed it a non-issue.
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post #6 of 9 (permalink) Old 02-17-2014, 01:30 PM
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The air is coming out of the heads and going into the airbox. It's an EGR setup, versus air injection to the exhaust.

The ports in the heads spit out exhaust gas, the reeds open outward toward the suction valve. So the reeds can't let air into the heads.

If anything, the mods must allow a slightly richer mixture to exist, reducing the pops and letting the pipes run cooler.

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post #7 of 9 (permalink) Old 02-17-2014, 02:48 PM
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Garage
Quote:
Originally Posted by Nadan8 View Post
In what I believe is the TOC manual,
First, I'd say download the repair manual in my signature. It's essentially the same as TOC's but, it's chapter-ed & a hell of a lot easier to go thru.

But, as to your question, like others said. It's easily removed. Infact, here is a drawing for the reed valve cover.


Last edited by kanuck69; 02-17-2014 at 02:51 PM.
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post #8 of 9 (permalink) Old 02-17-2014, 04:07 PM
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And here's a way to make them using the reed box for the pattern:
https://www.vn750.com/forum/showthread.php?t=32273

The engine has to be a lot happier without all that rubber on top of the rear valve cover.

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post #9 of 9 (permalink) Old 02-17-2014, 04:36 PM
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Or you can just buy a set ($15 I think) off ebay.

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