Question about 1998 kawasaki VN 1500 Vulcan Classic

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I have a 1998 Kawasaki 1500 Vulcan Classic. Which jets do I change if I'm changing my exhaust? What are the stock jets?

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You need to change the big main jet. the stock size will be stamped on the jet. Go for one or two sizes bigger. Your motorcycle shop dealer will help you out when you buy the jets.

Posted on May 11, 2010

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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

1 Answer

Why won't My 1998 Kawasaki Vulcan classic 1500 go into gear? transmission will not engage. Any idea whats wrong?


What does it feel like when you press the lever up or down and s there any resistance there

Feb 18, 2015 | 1998 kawasaki VN 1500 Vulcan Classic

2 Answers

The right side of my 96 vulcan 1500 seems colder then the left side exhaust


If you modified the exhaust or intake you will have to re jet the carburetors.

Mar 30, 2014 | 1996 kawasaki VN 1500 Vulcan Classic

1 Answer

My 2004 Vulcan Classic 1500 won't idle.


is the carb jetted? if so check to make sure it has the right size jets. too small of jets starve the engine of fuel, and too large flood it. also there should be 2 jets one main jet which controls the amount of fuel when at 1/4 throttle to fuel throttle and then there should be a second which would be the pilot jet that controls idle mixture (1/4 throttle and less) it's longer and thinner than the main jet with multiple holes for mixing air and fuel for idle. have them to make sure the jetting is correct. Also IF the engine had been bored you will need to use larger jets for the added volume in the cylinder chamber from the boring. aftermarket exhausts will also cause the engine to be rejetted but usually the sellers will have charts telling you what jets to run with the exhaust.

Nov 07, 2013 | 2004 kawasaki VN 1500 Vulcan Classic

1 Answer

1998 1500 Vulcan Classic. How to change fork oil and what weight and how much?


its very difficult to change the oil pork cause it take time to remove the pork and its not easy to unbolt it..so better go to the nearest motocycle repairshop and ask them to change it..

May 14, 2010 | 1998 kawasaki VN 1500 Vulcan Classic

1 Answer

I have a 1998 Kawasaki 1500 Vulcan Classic. I would like to know if an exhaust off a 2001 Vulcan 1500 will fit my bike?


The engines are the same, depending on model of the 2001 if its a classic then I'm sure it will, I would go to Vance & Hines's web site and check there fit on exhaust for a 1998 verses a 2001 you'll probably see that it carrys the same part number.

Apr 16, 2010 | 1998 kawasaki VN 1500 Vulcan Classic

1 Answer

Can a Stock motorcycle seat from a 1998 Kawasaki Vulcan 1500 fit on a 1994 Kawasaki Vulcan?


i,m not sure about kawasaki, but honda change things slightly every 2 years ust enough to make this sort of thing hard to do,,if you can offer one up from a friends bike and see what it needs ,it might mean making some bracket changes,try a motorcycle breaker and see if they can help.

good luck

Nov 19, 2009 | 1998 kawasaki VN 1500 Vulcan Classic

1 Answer

What are the stock spark plugs for a 1998 Kawasaki Vulcan 1500 Classic?


The stock plug was an NGK-DPR6EA9. However, some bikes had NGK-DPR5EA9 as stock. I would start with the ...6EA9 and then go to the ...5EA9 if a hotter plug is needed.

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Jun 11, 2009 | 1998 kawasaki VN 1500 Vulcan Classic...

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