Carb Rebuilt kit! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 19 (permalink) Old 12-15-2009, 03:44 PM Thread Starter
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Carb Rebuilt kit!

Does anyone know of a good carburators rebuilding kit. Where can I get them and how much do they go for?

I think my vn was kept in the garage for way to long prior to my purchase, I am only getting 30 miles to ther gallon I have seen posted on the site 38+mpg...

I have the ears on it but with a K&N replacement filter how should I adjust my mixeture screw?

Thanks in advance

Andre
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post #2 of 19 (permalink) Old 12-15-2009, 03:58 PM
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Theres is no such thing for these bikes. Most of the O-rings can be reused but if you need to replace any of them you'll have to order them seperatly. As for the air mix screw start at 1.75 turns out on each if all stock (exhaust too) and work from there.

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post #3 of 19 (permalink) Old 12-15-2009, 04:44 PM Thread Starter
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All I have is the aftermarket K&N Filter that fits in the original and how do I re adjust the carbs? by the feel?
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post #4 of 19 (permalink) Old 12-15-2009, 06:43 PM
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I have a guy I know that does carb rebuilding and rejetting using factory kawasaki parts. He cleans and adjusted carbs and set float levels --- He is inexpensive -- I cleaned my carbs when I got my bike running and then after a few months I met Steve and he recleaned my carbs and reset my float levels and such. He also has ideas and filters and jet kits available to adjust our VN 750 -- Contact him. It will be well worth your time --

His web site is www.carbworx.com. Steve Reed -- He is a factory Kawasaki carb specialist. Hope this helps.

Jeff

1995 Vulcan 750 26,000 miles
Mustang Seat
Ear shave
Cobra Exhaust
Rejetted carbs
Coastered
Unifilters

Cleaned and Rebuilt carbs from Steve at www.Carbworx.com Awesome service.
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post #5 of 19 (permalink) Old 12-15-2009, 09:02 PM
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I recommend using either stock factory filters, or their Emgo equivalent. K&N filters flow more air, and will lean out the mixture. Rejetting will fix that, but there is another problem. The reason K&N filters flow more air, is because most of them don't filter out dirt as well. IMO, unless you are building a racer or hot rod of some kind, it's best to stick with stock parts or equivalent. You won't get any kind of noticeable power increase by just switching to K&N filters, but you could shorten your engines life. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #6 of 19 (permalink) Old 12-15-2009, 11:15 PM
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Quote:
Originally Posted by VN750Rider/Jerry View Post
I recommend using either stock factory filters, or their Emgo equivalent. K&N filters flow more air, and will lean out the mixture. Rejetting will fix that, but there is another problem. The reason K&N filters flow more air, is because most of them don't filter out dirt as well. IMO, unless you are building a racer or hot rod of some kind, it's best to stick with stock parts or equivalent. You won't get any kind of noticeable power increase by just switching to K&N filters, but you could shorten your engines life. Jerry.
Dude, back away from the crack pipe please, cause you are way to high right now.

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post #7 of 19 (permalink) Old 12-16-2009, 02:15 AM
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As a professional mechanic with 32 years experience, and an amateur drag racer for longer than that, I stand by what I said, but I won't argue about it. Everybody is entitled to their opinion. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #8 of 19 (permalink) Old 12-16-2009, 05:46 PM
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Actually you are both smoking crack. The whole "internet legend" about K+N air filters is still wrapped in mystery. You can read both sides of the story here:
http://tinyurl.com/yao9vat

The real issue here my freinds, is yes, One can make an argument about K+N filters that are used on some cars... but I will still like to see real indepnedent tests. (K+N does in fact make alot of OEM filters so not sure how that test would go...lol)
But the fact here, that no one is pointing to, is that the stock filter is in fact a "foam" filter, which is the worst media to use in the first place. Even if a K+N filter was "dirtier" than a simular paper filter, it still would be almost 20 percent more efficiant than the foam filter used in the Vulcan.

So all you please don't get all paranoid about causing engine damage using K+N filters...even the ones that bolt right to the carb mouths.


KM

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post #9 of 19 (permalink) Old 12-16-2009, 11:46 PM
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The one and only purpose for an air filter is to clean the air before it enters the engine. Dirt in the air/fuel mixture will destroy an engine in a very short time. When a manufacturer designs an engine, they take the stock filter into account when they decide on the carburetor jetting. It all works together to protect the engine from dirt, and provide the proper air/fuel mixture. Hopefully, this is common knowledge on a motorcycle forum. When you make a filter less restrictive, the only way to do it is to make it more porus, which means more air gets through, but it also means more dirt gets through.


My dirt bike has a stock foam filter, which I wash in gasoline, and reoil after every days riding. I've had this bike (Honda XR400) for almost 5 years, and it shows no sign of engine wear. I replace the filter after so many cleanings with an aftermarket (Emgo) version of the stock filter. (much cheaper) K&N makes a filter for this bike too, but I won't use it. I want my engine protected.

I also drag race an '85 400 c.i. small block Camaro, which I built myself from the ground up. It has an Edelbrock tunnel ram intake, dual 650 CFM Holleys, topped with a Mr. Gasket street scoop, and of all things, a K&N air filter. But this is not a daily driver, it is towed to the track, and the scoop is kept covered except when actually racing.


IMO, K&N filters are only good for racing, where they see very limited use, and should never be used on street vehicles. I mean, you wouldn't put racing slicks on your street bike would you? They actually do work great on sportbikes, though they don't last very long, but hit the tiniest puddle of water, and down you go. And while I have slicks on my Camaro, there is no way you could use them on a street car. They would most likely last under 100 miles, and there is no way you can balance them for street use.


But, if you want to use K&N filters on your bike, by all means do so. It is after all your bike. Maybe it would work better with straight 60 weight racing oil too. Jerry.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #10 of 19 (permalink) Old 12-17-2009, 03:07 AM
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I also am a Master Mechanic of 25yrs that not only has built and raced drag cars but also built SCCA and AMLS GT2 and GT3 race cars. I have to say your opinion of K&N filters is just that, Your opinion. Most of the race cars I have worked on we don't use air filters and when we do we don't use paper or foam elements.

Foam elements are more porous than a K&N filter and are higher maintenence, thats why they were maily designed for off road use. They have less micron filtration and if heavily used they have to be cleaned daily.

We are using K&N's as they were designed for, street use and not off road. If I were running a dirt bike, Baja truck or a rally car than yes!! I would use foam filters since thats what they were designed for.

In short, street cars and bikes K&N's.
Race/Drag cars and bikes K&N's.
Off road Cars/Trucks and bikes Foam.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

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Last edited by lance328; 12-17-2009 at 03:21 AM.
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