Successful Single Carb Conversion - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 15 (permalink) Old 08-29-2018, 07:04 PM Thread Starter
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Successful Single Carb Conversion

Hi Everybody, this is my first ever post and after a few months in the making, I finally got my single carb conversion up and running with perfect air/fuel ratio and no lean or rich issues!

My setup consists of a mikuni round slide carb and a custom aluminium intake my best bud made for me. Being only 24 years old(same age as my bike) I wanted to make it still have its classic touch but with a modern day twist. If anyone wants all what I've done to the bike, feel free to ask.

https://youtu.be/xE6Cjrrhv54
Link to the video of it up and running!
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post #2 of 15 (permalink) Old 08-30-2018, 07:27 AM
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Awesome! Got any pics of the manifold or info on the carb you used?

-2016 Indian Springfield
Chieftain bars
Roadmaster heated seat

-1999 Kawasaki Vulcan 750
Ear shaved
Mufflers removed / 38/140 + 2 shims
Relay coil mod
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Emissions removed
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post #3 of 15 (permalink) Old 08-30-2018, 07:38 AM
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^that. Can't really see anything in that video 😕

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
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post #4 of 15 (permalink) Old 08-30-2018, 05:53 PM
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the video don't count. lol

if it goes vroom or boom, I LIKE IT!
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post #5 of 15 (permalink) Old 08-30-2018, 07:42 PM
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This looks really cool, any tech specs on the carb, jetting, custom fabricated manifold? A lot of people have asked about this setup on threads before, have only seen one or two successful examples of a running version, so any info you have would be awesome!

Earshave+Rejet (38/135) – NGK Iridiums – MCCT Conversion – Slipstreamer S03 Windshield – Custom Extended Backrest – Custom Highway Bars – MOSFET R/R – LED Underglow – Volt+USB In-Dash – Two-Wire & Blue-Wire Mod – Satin Black Engine Paint – Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
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post #6 of 15 (permalink) Old 09-02-2018, 10:24 PM Thread Starter
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Hey guys! Sorry about not responding back sooner, been really busy. So I took some pictures of the I take manifold. It's made out of aluminum and the angles from the block for it to fit are some funky angles from kawasaki. It is connected to the bike via radiator hose to resist the gasoline. The carb setup is an all stock jet Mikuni VM38 (38mm carb) connected via hard carb mount. The stock jets I've read from another single carb setup said that they run perfect. I've noticed it running great with no rich or lean issues showing on spark plugs.
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Thorn and GDI like this.
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post #7 of 15 (permalink) Old 09-05-2018, 01:38 PM
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Haha, brilliant job on the intake!

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post #8 of 15 (permalink) Old 02-15-2020, 12:59 AM
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What diameter is the intake going into the manifold??
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post #9 of 15 (permalink) Old 03-03-2020, 05:04 PM
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What is the reason for a single carb conversion (except in the case of needing a replacement carb)? Is this the type of project, to see if it can be done?


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

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Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #10 of 15 (permalink) Old 03-04-2020, 02:23 AM
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Very sloppy welds. A really good fabricator could probably do a good job on this. I wish the Vulcan 750 had come with one carb, but mine is running fine, and as complicated (I hate complicated) as it is, it is not likely to ever cause me any problems with the carbs. I never had carb problems with either of my other 2 Vulcan 750s. Just drain the gas out after a week, even if you think you might ride it the next day. That's the way most carbs get messed up. Owners letting them sit there with gas in them. Some carbs are easy to remove and clean, but not the ones on the VN750. So they need to be kept clean. If I am going to park my bike for more than a week, I drain the gas out of the carbs and fill them with Seafoam. I do have a single carb Sportster, and you can literally have the carb in your hands in 5 minutes. Now that's the way to design a bike.

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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