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Jet sizes and air srew settings

Just want jet sizes and air srew settings on a kawasaki kz750 1980 model

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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

I have a gpz 900r a8 it has keihin cvk 34 on it i put a 4/1 exhust on. what jet size do i go?


Hi, Fran 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.
http://keihincvk40.blogspot.com/2013/12/the-keihin-carburettors-for-gpz900r.html
Carburator Theory and Tuning
http://service.tanga-moteurs.ro/data/kawasaki%20GPz900R.pdf
OEM Parts for Kawasaki
http://mybikemanuals.com/kawasaki

Jun 01, 2017 | kawasaki Motorcycles

1 Answer

2003 Kawasaki KX 125 Sputters at high RPM


Hi, Nick 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.
High RPM sputtering bogging problem
Carburator Theory and Tuning
Kawasaki KX125 Service Manual
OEM Parts for Kawasaki
Kawasaki kx125 1997 Owner Manual

Jun 24, 2017 | 2003 kawasaki KX 125

1 Answer

I have a 2003 kawasaki vulcan 800 running cobra open 2inch pipes with a k&n air cleaner, it is a stock air box, do i need to jet the carb or can it be adjusted, if so what jets would you recomend


it is best to have the carb. jets changed for better perform. it my help the pipes from bluing also.you can go on line AT J AND P CYCLES .COM THEY MAY CAN TELL YOU WHAT SIZE JETS YOU NEED NOT SURE.

Aug 18, 2011 | 2003 kawasaki VN 800 A Vulcan

1 Answer

1983 ltd kawasaki 440 i put pods for air on carbs what sizes jets do i need.


If the "pods" are meant to be direct factory replacements, then no jetting is needed.
Filters like K&N will come with instructions if any jetting is needed for their installation.
You'll need to check with the manufacturer of the "pods" - since you didn't provide the make/model of them here, I can't say for sure if they require a jet adjustment, replacement, or if you don't have to do anything.

Feb 24, 2011 | kawasaki KZ 1300 A3 Motorcycles

1 Answer

How do yo adjust the air/fuel mixture on a 2002 KLX300?


Kawasaki made them that way in order to meet the California emissions controls. ie. there is one available size pilot jet, main jet and needle from Kawasaki. They are all pre-set. Many people buy a Mikuni pumper carb. I didn't. I own a machine shop so I modified the stock one. I made some mini adjustment rings for the needle and modified the main jet diameter to suit. I had to tune it until it didn't lean bog any more. Now it runs great. The mod worked for me. I was leaving to go riding the next day so getting the carb wasn't an option. Most people buy the carb and like it.

Oct 08, 2010 | 2002 kawasaki KLX 300 R

1 Answer

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


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.

May 09, 2010 | 1998 kawasaki VN 1500 Vulcan Classic

1 Answer

Are the carbs on the us model and the uk model have the same specs.on a kawasaki vn 800 2005


the us bikes are normaly set up to meet the california clean air regulations, as europe have/had no restrictions i would expect the would be jetting differences, prob on the lean side of things for the us bike larger main jet etc, if you find a carb check and see what jets are fitted for main and pilot, also the needle might be set lower..( weaker )

Dec 18, 2009 | 2005 kawasaki VN 800 Vulcan Classic

1 Answer

Kx 85 04,bike had a slight bog when throttle was gassed then i cleaned the carb,now it really bogs and running very rich.i also messed with the air & idle screws hoping i could fix the problem &...


Start with setting the air and throttle screws. Turn each one inward until it GENTLY seats. Back each one out one and one half turns. Clean the air filter and starter plunger. The plunger may need to be rebuilt or replaced. Check the pilot and main jet sizes. There will be a number stamped on the side of the jets. The pilot jet should be #45, the main jet should be #140.

Aug 01, 2009 | 2004 kawasaki KX 125

2 Answers

Which size Jet Kit for 800 Vulcan Classic?


general rule of thumb is to go up about 10 jet sizes,unfortunately it is a bit of trial and error,and you may have to swap out diferrent sizes to get the bike running right,(jets are quite cheap though)but first step about 10 sizes from standard,your local dealer should be able to tell you what jets are in it and supply replacements,if you change to a hgh flow aftermarket air filter you may have to change jet sizes again as changing the filter may effect the mixture ratio in the carbs,,hope this helps

Jul 09, 2009 | 1996 kawasaki VN 800 Vulcan Classic

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