Question about 1999 kawasaki ZZR 600

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99 kaw600 ninja runs great upto 6000rpm then falls on face.Cleaned fuel filter,looked for shorts,chaned gas,cleaned carburetor(140 main jets)no change.The bike has a D&D exhaust on it.HELP!

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  • Anonymous Mar 31, 2014

    I want original main jet number and pilot jet number ofcarburetorof Bajaj boxer ct deluxes because someone has changed the jets of carburettor iam facing the milage problem so iwant original main jetand pilot jetof Bajaj boxer ct del 100 cc K_tech engine to replace the same for the good mileage

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Hi and welcome to FixYa,

It would seem a lean air/fuel mix. Pls check your sparkplugs and note color. If it is very light brown almost whitish, then it is confirmed to be lean. If so, possibly an air leak in the airbox/enclosure. Another possibility is if the bike is using aftermarket free breathers such those from K & N. If yes, try restricting the incoming airflow. Temporarily install upholstery foam over the after market air cleaner. You may have to experiment with the thickness.

Would appreciate a postback on the results and any developments.

Good luck and thank you for using FixYa.

Posted on May 12, 2009

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I have a zx6r f1 1995 ninja. I recently had the downpipes changed on the bike. Now the bike struggles to go past 40mph. I have taken it to a dyno specailist and he as checked the carbs etc and hey are...


Hi, Melvin for openers you need to seek out an experienced professional technician that knows what he's doing, this isn't rocket science and Dyno's are a waste of time, money, and are brutal on your engine and if there is a catastrophic engine failure while on the Dyno guess who pays for a rebuild or a new engine, here's a little hint it won't be the Dyno operator or the company he represents. I have been in the motorcycle business 35 years and worked on thousands of bikes and never once needed a Dyno to help diagnose a performance issue.
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, 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.
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Hi, Anonymous if you have changed your engine size, compression ratio, 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" you're not getting enough fuel.
1. Close 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.
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4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
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For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
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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.
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5. 3/4 to wide open throttle is managed by the main jet and air jet.
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1. Close 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. A wide open throttle is managed by the main jet.
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