Question about kawasaki ZX-6R Ninja Motorcycles

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Pilot jet bike will only idle down to about 5000 rpm no matter where I set the p jets,why?

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  • 93 Answers

Either your throttle cable is stuck, or the idle screw is turned up too far.

Posted on Nov 28, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

  • 3567 Answers

SOURCE: 1981 gl1100 has 4 keihin carbs bike sat 7 years

39dcb9a.gif5ab3c33.gif
648d54b.gifWhen removing the pilot jet screw, count the number of turns to remove. Put the screw back the same number of turns then unscrew 1/4 turn.
A “very helpful” rating on this answer? Thanks!

Posted on Jul 02, 2009

1fastbob
  • 301 Answers

SOURCE: Honda Valkyrie Interstate 1999: 25000 miles Cobra

Stock size for the slow jet is 35. Some guys put in 38's to make them less prone to getting plugged. I would say that you still have gunk in the slow jets. Also turn the pilot screws out 2 1/4turns. If the exhaust pops and you have no exhaust or vacuum leaks turn the pilot screws in 1/4 turn at a time till it goes away.

Did you change the plugs and the air filter? How about checking and or replacing the vacuum lines?

You might try a full bottle of Techron fuel system cleaner in a tank of gas. It may clear the problem up.

I had to clean the jets on my 1999 I/S twice and it's not a fun job.

Hope this helps.

Bob

Posted on Oct 14, 2009

Benimur
  • 6966 Answers

SOURCE: aprilia af1 125 sintesi, carb settings, what are

Hi and welcome to FixYa,

Jet size would depend which carb is installed, a Dellorto 34mm?

Initially, check the sparkplug tip colors. If very light brown to almost whitish, then lean mix; too much air, too little gas. Try raising the needle if if has notches and moving the e-clip. If fixed, use small thin washers. The basic idea is to make the needle rise early on throttle movement.

If an aftermarket open breather air filter is installed, then it would be causing the lean mix, too much air. Restrict the filter by adding temporarily upholstery foam to experiment at which thickness the flatspot would disappear.

Good luck and thank you for asking FixYa. Happy Holidays.

Posted on Dec 17, 2009

Benimur
  • 6966 Answers

SOURCE: WHAT SIZE MAIN JET AND PILOT JET ARE STANDARD WITH

Hi and welcome to FixYa,

On a 2003 Kawasaki KLX125, these are standards:

  • main jet - 145
  • pilot jet - 17.5

Good luck and thank you for asking FixYa. Happy Holidays.

Posted on Dec 18, 2009

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I did a full am detailed carb cleaning an tank cleaning as well as petcock cleaning bought new vaccum hoses an gas hose the bike is a 2000 kawasaki zrx 1100 it has 4 k&n airfilters installed it cranks an...


Lindsey... your problem is the classic issue with plugged jets. Specifically the low speed speed (pilot) jets are clogged. With the carb removed and the float bowl removed, and the float also removed, you'll see generally two sets of jets. Usually the one in the center is the main jet and has a larger hole and that jet doesn't usually clog but to be sure remove it and inspect the opening. If you can't see light then it's clogged. The more suspect issue is the pilot (low speed jet), usually off to the side. This jet, once removed has a longer body and this is the jet that is clogged. Perform the same "look thru" and you'll see no light or very little. When this jet clogs it displays the symptoms you mention. As you give the bike throttle, transition from idle thru low speed and then to main jet occurs, based on rpm and throttle demand. The pilot jet doesn't allow transition and the bike falters from about 2000 to 5/6 k rpm.

So how to clean. I've tried acetylene torch tip cleaners but most are too big. If you have an air compressor, try blowing high pressure air thru the jet and it may clear. The ultimate fall back is a chemical clean. Place the jet in a ultrasonic tank or purchase Berryman's carb cleaner in a small tank (1 gallon) (Auto Zone or internet)http://www.amazon.com/Berryman-0996-Chem-Dip-Carburetor-Cleaner/dp/B00DSMEL2A/ref=sr_1_1?s=automotive&ie=UTF8&qid=1419804749&sr=1-1&keywords=berrymans+carb+cleaner
and soak the jets in it. Here's another potential problem... the pilot hole in the body of the carb may also be plugged so while at it disassemble the soft parts from the carb and treat the carb body (no soft parts) also in the carb cleaner. Usually about 1 - 2 hrs soak removes the clog. Best to clean all holes in the carb body with high-pressure air. Since you have a four cylinder then you must perform the same exercise 4x. This will solve your problem...

Good Luck... Dio

Dec 28, 2014 | Motorcycles

1 Answer

Factory Jet Sizes


Front cylinder carburetor:

·
112.5 Main Jet

·
17.5 Pilot Jet

·
(1) 0.020" thick shim washer under the needle

·
PMS setting apparently varies from bike to bike... but it should be 2.5 turns

Rear cylinder carburetor:

·
110 Main Jet

·
17.5 Pilot Jet

·
(1) 0.020" thick shim washer under the needle

·
PMS setting apparently varies from bike to bike... but it should be 2.5 turns

May 23, 2013 | 2000 Yamaha V Star 1100 Classic

2 Answers

I have a 2008 zip 50 4t. It runs well in idle. But when i increase the throttle the engine nearly dies on me. It can also happen that when i test drive it runs well for a sec or two but before it reaches...


Hi, Mr Juergen,

From your explanation, it is clear the problem is on your jetting system i.e. the main jet on your carbureter.
When in idle the main jet is not in use but pilot jet. While you increase the RPM the main jet has the main role to accelerate the RPM/speed.
You can try re-clean again the main jet nozzle on your bike and let's see what happening.

Please note : over time your main jet can be deteroirated and if this is happen you may need to get new carbureter kit. It contains jettings, seals, o-ring etc.

Best luck.

Sep 03, 2011 | 2008 Piaggio Zip 50

1 Answer

Starts but will only keep running while choke is on


Most likely your slow (idle, pilot, whichever name you prefer) jets are plugged up in your carburetors. If the bike was stored improperly, or old/dirty gas was in the tank, these jets get plugged up pretty easily. One if not all are probably affected. The slow jet is where your bike pulls gas while it has a closed throttle position. Its the smallest jet in the carbs. When you twist the throttle, the needle (blocking the main jet from being used) opens up and allows gas to pass it and up into the vacuum of your carb and into your engine. If the idle jets are plugged you will usually notice that if you give the bike throttle it will run great in the higher RPM (3000+) but will die and be "glitchy" or boggy when going from no throttle to open throttle. You can try to cheat a carb clean by getting some carb cleaner and spraying that down the carbs, and using seafoam or equivalent to get those jets clean, but its always a better bet to see whats going on inside and clean those things so you get your throttle response back. Goodluck.

Bruno

Oct 21, 2010 | 2001 kawasaki ZX-6R Ninja

1 Answer

I have a primary jet and secondary jet in the carburator of the 500 gl silverwing . and the jets I have is 75 and 125 which goes where . and what should be the setting on the air jet ?


The secondary main jet (125) goes into the jet needle holder in the center of the carb (needle). The primary main jet (75) is between the secondary main jet and the pilot screw (this one is slightly off center) . The start setting for your air screw should be 1 3/4 turns. Warm up your engine and drive for ten minutes. Adjust your idle speed to 1100 + or - 100 rpm. Now turn pilot screw in or out to get highest idle speed. Readjust idle to 1100 rpm. Now turn pilot screw in till idle speed drops 100 rpm. If pilot screw seats go to next step. Adjust the pilot screw out 1 full turn from 100 rpm drop point. Now reset Idle to 1100 rpm. That is how Honda says to set your air screw. Standard setting is probably sea level and going through the procedure will set you up for the altitude where you ride. Do the adjustment during good weather at the altitude you plan to do the most riding.

Aug 27, 2010 | Honda CX 500 B Motorcycles

1 Answer

My bike has low-endbog


Could be the jetting is off at your lower side. Tis could be from the pilot jet which controlls jetting from idle to 1/4 throttle. You also have an air screw you can slightly tweek, but this is more reponce when you throttle it off of an idle.
Don't forget that a stuck power valve may effect performance, but these are normally for higher rpm's

Nov 23, 2009 | 2003 Honda CR 125 R

2 Answers

1981 gl1100 has 4 keihin carbs bike sat 7 years soaked carbs and cleaned. runs well over 2000 rpm but won't idle. Was told might be idle jets plugged but can't find which jets are idle jets in my service...


39dcb9a.gif5ab3c33.gif
648d54b.gifWhen removing the pilot jet screw, count the number of turns to remove. Put the screw back the same number of turns then unscrew 1/4 turn.
A “very helpful” rating on this answer? Thanks!

Jul 02, 2009 | 1981 Honda GL 1100 Innerstate Gold Wing

1 Answer

Cannot start not using the choke and rpm flattens at 4000 rpm


The air screw and the idle screw turn inward until they LIGHTLY seat, then back out one and one half turns. For the dead spot, pull the slide out of the carb and move the clip on the jet needle down one notch. Two notches if needed.

The pilot jet covers the idle function. It sounds like this is not the problem though. The high idle indicates a lean fuel mix. An air leak is leaning the mix. It could be bad intake manifold gaskets, carb and manifold not down tight, loose spark plug, cylinder head not tight, bad head gasket.

If you do want to adjust the pilot jet the, often it is adjustable from the outside of the carb. It is normally located just out side and next to the main jet. It will be brass and have a slot for a small screw driver. If no outside screw, then an inside adjustment screw means removing the float bowl. Turn the jet screw outward 1/4 to 1/2 turn.

Apr 26, 2009 | 1997 kawasaki ZZR 400

1 Answer

Hard start, wont idle 2000 kaw 300 r


if your pilot jet is pluged it will not idle. the pilot jet controls fuel from o-1/8 throttle setting only

Mar 16, 2009 | 2002 kawasaki KLX 300 R

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