Question about 1999 kawasaki VN 1500 Vulcan Classic

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1999 VN 1500 Classic Air/Fuel Ratio

Is there any way to moderately/drastically adjust the air/fuel ratio without buying a jet kit or taking it to a shop? I just don't have the money.

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  • Mike Peluso
    Mike Peluso May 11, 2010

    Become a member of the Vroc group. Membership is free. I ride with this group & there are many riders who can help you. Once your a member you can post on the site. Re-jetting is costly & you do not want to damage the engine. Here is the Vroc link;




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Yes,but it will only make it run bad by either being too rich or too lean,It will not increase power or MPG's and will be damaging to the internals.

So what are you trying to achieve? Better mileage? More power? quicker response? What?

Posted on Jun 01, 2009

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Different jets is the only change air/fuel mixture

Posted on Jun 01, 2009


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1998 Kawasaki Vulcan 1500 carb tuning

Hi, Mark if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
carb adjustment
Carburator Theory and Tuning
Kawasaki VN1500 MEAN STREAK Service Manual
OEM Parts for Kawasaki
1998 Kawasaki Vulcan 1500 Classic Owner Manual

Jul 11, 2017 | 1997 kawasaki VN 1500 Vulcan Classic

2 Answers

Need tool for adjusting air fuel ratio for husqvarna 235 chain saw

It should be a spline tool. It is the most common one.
Genuine Poulan Weedeater Part 530035560 Carb Adjusting Tool

If you work a lot 2 cycle trimmers and chainsaws you might buying the set of four adjustment tools.
2 Cycle Carburetor Adjustment Kit Includes 530035560

Nov 07, 2014 | Husqvarna Garden

1 Answer

1997 kawaski vn 1500 Vulcan classic d raw fuel down needle value of carb

sounds like carb, is airfilter set up ok, it can act as an air restrictor to match the jetting

Feb 16, 2013 | 1999 kawasaki VN 1500 Vulcan Classic

1 Answer

How do you change the air/ fuel ratio

The engine is fuel injected, meaning the engine computer controls the air/fuel ratio. The fuel delivered is based on many different sensors that give information to the computer. The computer then makes instant adjustments for optimum performance, fuel mileage and emissions. You cannot adjust it manually. Are you having a specific problem with the performance?

Oct 05, 2012 | 1999 Ford Escort

1 Answer

Have a 2000 1500 cc vulcan classic non FI. Have had carb cleaned twice new air filter bike spits fuel out the air filter and will not start


This sounds like a Float issue. If the Float becomes saturated with fuel, it will be too heavy to stop fuel flowing into the carburetor, hence fuel coming out the air filter. It also could be an adjustment of the Float. One other thing that could cause your problem is the needle/seat. Check for excessive wear.

Hope this helps. If you find this information useful, please vote on this post. Thank you.

If you need more help with this issue, please post a Comment and I will get back to you as soon as I can.



Jan 25, 2011 | 1999 kawasaki VN 1500 Vulcan Classic

2 Answers


Issue with your Timing Advace need to be re-ajuste Carb need tune up also.. Check Spark Plug for bad performance.. Take a carb calibrator to ajust those Carburator.. nice but Touchy You will get the best performance and you will save much more on gaz...If it persist ..Well your Valve as to be check' Up

Sep 30, 2010 | 1999 kawasaki VN 1500 Vulcan Classic

1 Answer

Fuel Mixture Ratio Is it - 25:1 40:1 50:1

not sure if yo are changing the jets out but if your using the original screws and jets screw both screws in till they stop then turn 1 and a half turns out they try starting if it kicks and won't run then turn each screw another 1/2 turn out try starting if it runs rough adjust the gas jet a little bit till it runs smooth once it warms up give it full gas and you should get just a slight puff of black smoke to be set right, if it's too lean it will get hot and will be hard to start if it dies, if that happens then give it extra gas. once warmed up it should idle without dyeing if it dies adjust the idle screw up 1/4 turn at a time till it runs at idle without holding the gas trigger, be sure you replace the in line fuel filter and fuel line first then clean the air filter before doing any adjustments. most problems are caused by plugged fuel filter due to ethanol in the gas.

Mar 10, 2010 | Garden

1 Answer


Two cycle engines must have a completely sealed crankcase to work properly. When the crankcase is sealed, the air to fuel ratio is set by the carb to optimize the operation of the engine. You can try the carb adjustments, I'd suggest backing out (counter clockwise) the high speed jet, if it has one. If not, it's a fixed jet and you'll have to disassemble the carb to clean it. If your engine on runs best with the choke on - the air to fuel ratio is messed. In other words, either you have a restriction in the carb preventing the engine from inhaling enough fuel and you're using the choke to get the right air to fuel mixture OR by restricting the air intake (putting the choke on) your engine is getting its air needs from some other place, such as a leaking seal or gasket in the crankcase. If you run the engine like his for long, you run the risk of burning up the cylinder and making a boat anchor out of the unit. A two cycle mechanic would do a pressure test on the crankcase to check for air leaks. If you're not able to have someone pressure check the engine, your best bet is to look for loose screws on the cylinder/crankcase - and to make sure the fuel delivery system (fuel filter in the tank, fuel line, and carb diaphragms) is in proper condition - replace the filter if dirty, fuel lines if mushy, and put in a carb kit. If that doesn't fix it, you've likely got an air leak that's going to require a mechanic with the proper test plates to find and fix.

Oct 09, 2009 | Garden

1 Answer

Stage 1 jets didnt work

pull the breather cover off and see how it does it sounds like you need more air going in when you go up on jet size it will change the air fuel ratio thus making it lack power or just run absolutely funny

Jan 14, 2009 | 2004 Yamaha V Star Classic

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