Single Carb? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 61 (permalink) Old 02-03-2014, 02:57 AM Thread Starter
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Single Carb?

I am totally tired of these carbs on this bike!!
I have had them off more than any bike that I have owned since I started riding in 1956!!

Has anyone thought of making a single carb manifold for a VN750?
If I were still in California, I would have made one a long time ago, but here in the Philippines, there ain't much around in the way of a good macnine shop.

I would like to run a Harley type CV. You can pick them up cheap as a "take-off" when they change to a S&S or Mikuni.

Think how much better it would be to have just ONE carb to work on!!!
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post #2 of 61 (permalink) Old 02-03-2014, 07:03 AM
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Or fuel injection.

Single carb been talked about. But not sure if anyone had actually done it yet.

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post #3 of 61 (permalink) Old 02-03-2014, 09:24 AM
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I love these carbs I could pay my rent three times a year just keeping the local guys carbs clean

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post #4 of 61 (permalink) Old 02-03-2014, 11:26 AM
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Quote:
Originally Posted by honest Al View Post
I am totally tired of these carbs on this bike!!
I have had them off more than any bike that I have owned since I started riding in 1956!!

Has anyone thought of making a single carb manifold for a VN750?
If I were still in California, I would have made one a long time ago, but here in the Philippines, there ain't much around in the way of a good macnine shop.

I would like to run a Harley type CV. You can pick them up cheap as a "take-off" when they change to a S&S or Mikuni.

Think how much better it would be to have just ONE carb to work on!!!
it has been thought about, I have even drawn one up on several occasions. But as I start to get ready to build one, I realize there is one huge draw back... Calculating CFM, and Jetting to get the carb dialed in, and I don't have access to an engine Dyno to properly adjust everything once I do get it done. I have been thinking about going with a "Micro-Squirt" injection system since my CDI already has a circuit built in for using the stock ignition pickup coils to calculate the FI squirt. Maybe one of these days.
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post #5 of 61 (permalink) Old 02-03-2014, 11:57 AM
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Quote:
Originally Posted by slimvulcanrider View Post
Calculating CFM, and Jetting to get the carb dialed in,
That seems the easy part to me, Use a CV 36 and jet to the middle of Keihjn's recommendations as per air jet size.
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post #6 of 61 (permalink) Old 02-03-2014, 02:22 PM
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Originally Posted by wmsonta View Post
That seems the easy part to me, Use a CV 36 and jet to the middle of Keihjn's recommendations as per air jet size.
only 4mm bigger than the stock 32mm x2... I would think you would want a 50-60 mm carb to feed both cylinders since each 32mm carb feeds one, you would want to double it... But that is where I am confused... I know when building a HP V-8 engine if I we're going single carb I would want a 750-850 CFM Carb, but when going to a Dual 4 barrel, we always go with 450-600 CFM...
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post #7 of 61 (permalink) Old 02-03-2014, 02:38 PM
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You are only feeding one cylinder at a time

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post #8 of 61 (permalink) Old 02-03-2014, 02:43 PM
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true, but I would be afraid of fuel starvation in the higher RPM range
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post #9 of 61 (permalink) Old 02-03-2014, 04:44 PM
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I recently helped with a Harley with Screaming Eagle parts. It had, from memory a 40 mm CV carb. Over 1400 cc.

To reference the Kaw manual, an intake valve is only open for 284* out of 720* per complete cycle. One single 34 mm CV would out perform twins until probably 6000+ rpm. A single is win/win with half the fuel standoff and intake reversion.

Why did Kaw use twins? Easy. If you take the vn to redline and shift, the shift recovery is from a high rpm. With the relatively large cam overlap and the right size carb's, throttle response would suffer some. So they under carbed the vn and used twins.

The old KZ 750 had, I believe, 38 mm Mikuni's(60 hp). My '83 Shadow (68hp) had 36 Kiehin's.

edit- the reason for the airbox, is it is larger than the cylinder swept volume. 45 cu in. The atmosphere has over twice the time to fill the airbox as with an individual 'tube'.

Last edited by wmsonta; 02-03-2014 at 04:50 PM.
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post #10 of 61 (permalink) Old 02-03-2014, 05:14 PM
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The virago guys do it cause their carbs REALLY suck

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rejetted for K/N Pods part#rc 2340
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