One Piece Airbox/Surge Tank Removal-no cutting - Page 3 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #21 of 48 (permalink) Old 10-23-2013, 05:29 PM
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It does appear that the carbs themselves are the most restrictive part of the intake system. But if you take an emissions analyzer, and get a reading with the whole system intact, then remove the ducts from the carbs, run it with no filters at all, you will get a leaner reading. If you want to go further, it actually looks like the valves are the most restrictive part with stock cams. But that's not what the analyzer says. It's a little more complicated than the actual size of various openings. You also have to take air velocity into account.

On the duct installation thing, I tried the stuffing them in past where they were supposed to be, with the idea of pulling them back out, but just couldn't get my hands in there to do it. They just wouldn't bend enough on the top end. The only option was to remove both air filter housings and the cooling system parts like the manual says. And since I figured I would be removing the carbs again (I've done it twice already since modifying the ducts) I decided to try and find a way to make it easier.

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post #22 of 48 (permalink) Old 10-23-2013, 05:47 PM
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post #23 of 48 (permalink) Old 10-28-2013, 01:32 PM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
It does appear that the carbs themselves are the most restrictive part of the intake system. But if you take an emissions analyzer, and get a reading with the whole system intact, then remove the ducts from the carbs, run it with no filters at all, you will get a leaner reading. If you want to go further, it actually looks like the valves are the most restrictive part with stock cams. But that's not what the analyzer says. It's a little more complicated than the actual size of various openings. You also have to take air velocity into account.
I don't buy a bit of this. I was involved with your post until the part where some kind of analyzer told you the valves were not the restriction.

Justification of your position?

Even though I prefer to tune street with a narrow band, I have owned a wide band w/data logging for 10 years. I have been asked to be involved with the tune up on 4 M/C and a handful of street cars this year. I will only 'help' competent mechanics.

You and I would have an argument and maybe a bet if I cared more than I do.
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post #24 of 48 (permalink) Old 10-28-2013, 02:14 PM Thread Starter
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I was involved with your post until the part where some kind of analyzer told you the valves were not the restriction.

Justification of your position?
I had a similar question. Hypothetical answer: A flow bench?

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post #25 of 48 (permalink) Old 11-27-2013, 08:21 AM
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Did this removal make the bike run any better? Or was it for looks...
Sounds like a lot of work.
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post #26 of 48 (permalink) Old 11-27-2013, 08:55 AM Thread Starter
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Wink

I didn't have any seat time to make a comparison, had only ridden a mile before tearing into the work ... stator, dampers, earshave, and coasters. Also tires and spline lube.

Everything I read here said the earshave improves performance. It does run great, I know that.

If I ever have to pull the carbs, it will be a lot easier. It's also nice to have all that plumbing gone.

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post #27 of 48 (permalink) Old 11-27-2013, 10:52 AM
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Quote:
Originally Posted by brions750go View Post
Did this removal make the bike run any better? Or was it for looks...
Sounds like a lot of work.
Guess if you consider it "work" you'll just not understand....

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post #28 of 48 (permalink) Old 11-27-2013, 11:38 AM Thread Starter
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It's really not that much work. Like I said before, it takes more to write it up than to actually do the jobs.

After you get the plumbing and airbox out, slap on the filters and coasters, then hook up the harness.

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post #29 of 48 (permalink) Old 01-22-2014, 03:54 AM
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Hi Spock, read your job on removing the air box,so I reversed the procedure and refitted the air box. It gave me a little trouble getting the spouts on the front of the air box, over the front rocker,so I shortened them a tadd. During the process I discovered, the smaller of the two,when cut, opened up to a much larger diameter. So I saved the off cut, for the purpose of refitting in the carby breather line. My presumption is, that the engineer that designed the thing calibrated the size to let the carburettors breath as opposed to being vacuumed. Alternately, I may just run an accessory breather filter, and cap the old one. I never though that air box would ever go back in, good tip Spock. Thanks.
I must have pushed the wrong button the reply was to Spocks air box removal. OOPS!

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post #30 of 48 (permalink) Old 06-07-2016, 04:57 PM
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I just stuck this thread in the carbs and fuel forum.
(I don't think stickyed is a real word. lol )

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