Question about kawasaki ZX-6R Ninja Motorcycles

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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 fine, its got new plugs in it, the air filter as been cleaned and thats fine. but the bike still won't run right. Even the dyno guy is at a loss as to what could be wrong with it. As it ticks over great without any problems. can anyone help as its costing me a hell of a lot of money already. But still no joy.

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  • kawasaki Master
  • 55,996 Answers

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.
zx6r 1995 1996 1997 Team Kinkos Muzzys carb tuning factory pro eddy...
Carburator Theory and Tuning
Kawasaki 1994 Ninja ZX 6R Service Manual
OEM Parts for Kawasaki
Kawasaki Ninja Owners Manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on May 19, 2017

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4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Benimur
  • 6966 Answers

SOURCE: Just taken carb off of a Yamaha sr125

Hi,

Offhand, I would suspect the clear tube to be overflow while the black (smaller and connected at the bottom of the bowl near a bleeder screw) would be drain hose for removing stale or contaminated fuel inside the carb's bowl. As long as their is no suction on any of the tubes with the engine running, you should be OK. Should there be suction felt at the free end, then it should be connected somewhere and most likely would be to the fuel valve/petcock or must be plugged.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 17, 2008

  • 23 Answers

SOURCE: GSXR 750 Slingshot wont rev past 5000rpm, with or without choke

I have seen this before a few things to do too make sure. First take the air filter out and shine a light use your fingers to move the slides up and down I suspect the springs that go on the slide is not seated in center you can tell from the slide going halfway and hanging up. Next, the boots on the slides only go on 1 way there is a notch on the carbs for them. I would guess this would fix you up if not we can get deeper into it with air-fuel mix screw settings.good luck

Posted on Mar 25, 2009

19ken55
  • 426 Answers

SOURCE: Hi , my suzuki Bandit GSF 600 2002 plate, off road

Ride the bike 20 or so miles on open road. Stop and remove plug to inspect. 'Are they black or white ?


Black =rich white=lean

Posted on Feb 01, 2011

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