Question about 1985 Yamaha XJ 700 S Maxim

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Carb jets how many turns out on the air screws?

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  • Yamaha Master
  • 767 Answers

Two and half turns, make sure the engine has reached it's running temperature.

Posted on May 01, 2013


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Posted on Jan 02, 2017

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SOURCE: Cleaning Carb Jets

not to a trained ear also go by rpm and spark plug color

NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate

better use a manometer for adjusting screws

depends on condition of org parts

worn = richer running

new = lean an clean

also if changed the exhaust system need to
re-calibrate carbs for max performance

Posted on May 09, 2009

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SOURCE: I hear talk of an air jet for the mukuni bs34

I believe they are referring to the nozzle the needle goes into. A venturi effect is created by the position of the nozzle in the throat of the carb. The nozzle has holes in it and the fuel is sucked through the main jet and out the holes to mix with the rushing air as the needle raises. Beyond that I haven't got a clue.

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Posted on Jun 09, 2009

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Best way to adjust carb

Hi, Depending on the bike in question most carbs are preset by the manufacturer. The main jet, needle jet and pilot jet are all a predetermined size, that meets the engine requirements. The only adjustments are idle and the pilot air screw. If you have poor running remove the pilot air screw (pas) from the carb, and check for damage and debris. Clean the pas carefully spray some meths into the hole in the carb, if you have more than one carb you have to do this to all of them. Replace the pas very carefully and screw it in gently until it stops do not try to over tighten when it stops. Now undo the pas the amount of turns stated in your owners or service manual. normally this is between 1½ and 2½ turns but do check your manuals as no 2 bikes are the same. Hope this helps

Sep 24, 2015 | Motorcycles

1 Answer

How do you adjust the high speed, low speed jets on a 2002 Yamaha Road Star carburator.

The jets are not adjustable. Well - the pilot jet is adjustable a little by turning the air screw, but this is for fine tuning, not for correcting an incorrectly sized jet. If the air screw is screwed out more than about 2.5 turns, the pilot jet is too large and if it is turned in less than 1 turn, your pilot jets are too small.

Adjust the air screw out until you get the highest, smooth idle and then turn back in about 1/4 turn or less.

It is a good idea to check or just change your air filter prior to making any mixture or carb adjustments - make sure the intake tract is not restricted and make sure the spark plugs are in decent shape.

To 'adjust' the jets, they must be replaced. I know this is not what you were hoping to hear, but to adjust the jetting, the carbs have to come off and you have to get into the float bowls to physically change the jets.

Sep 14, 2011 | 2002 Yamaha Road Star Silverado

1 Answer

Can i adjust the carbs on my 2001 yamaha r1 to run a bit richer what should i do cause my bike is running lean over 8000rpm

there is a fuel screw at the bottom of the carb, i would close it (turn it in) all the way, and then back the screw out 1 and a half turns, then go from there, if it is still too lean, turn the screw out 1/4 turn more, and then again if still too lean. has anything been done to the bike, new after market exaust? because then maybe you need to rejet the carb to get fuel to the engine a little faster. you can get a jet set....all the jets that match from moose racing. the jet sets are packaged as a kit. you would get a new needle jet, main jet, pilot jet, air jet. but befor you go through all that i would tinker with the fuel screw.

Apr 13, 2011 | Yamaha YZF-R1 Motorcycles

1 Answer

2005 suzuki wont stay running, i had just bought it and it will start but putt around but cant reach high rpms. does the carburetor need to be cleaned?

Remove the carb from the bike.
Completely disassemble the carb
Soak all jets, needles, springs, screws and carb body in a carb solution overnight.
Do Not soak any o-rings or the float. Clean the float with a brush, and replace the o-rings if they are flat.
Rinse with water and then blow everything out with compressed air.
Make sure you can see through the jets and the small holes on the side of the jets.
Make sure you blow through every hole in the carb body.
Reassemble carb, mount on bike.
It will run like new again.

NOTE: When removing the air/fuel mixture screw, turn it in(clockwise) until it stops and STOP turning, Do Not try to tighten any further.
Count the number of turns it took to stop. Write it down so you dont forget overnight. Remove it for cleaning.
When you reassemble the carb, turn the air/fuel mixture screw in until it stops.
Now turn it out(counterclockwise) the number of turn you counted.
If your not sure turn it out 2 turns.

Dec 12, 2010 | 2001 Suzuki DR 200 SE

1 Answer

How to install a new jet kit with my new pipes

You can change the jets in your Keihen carb without removing the carb. First remove the air cleaner cover, air filter element, and the backing plate. There are four screws holding the float bowl onto your carb, turn the petcock to the off positon (if it has an off positon) and remove the four screws and drop the float bowl down.

You will be able to see them main jet very easily. It's screwed into the main jet holder and extends down to the very bottom of the float bowl when the bowl is on the carb. Simply screw the old jet out and screw the new one in.

The slow jet will not be visible directly. It's up inside a hole just to the rear of the main jet holder. You may need a mirror to find it. Once you've found it, use a narrow bladed screwdriver to remove the old one and install the new one. Replace the fuel bowl, air cleaner assembly. Check for proper operation of the throttle before starting the engine.

Now, if you jet kit contains a different slide needle, you'll have to remove the carb to replace this. Once you get the air filter assembly off the carb, loosen the throttle cables at the throttle grip and disconnect them at the carb. Then disconnect the fuel line and the vacuum line from the carb. Pull the carb out of the intake manifold.

To replace the needle, remove the four screws that hold the top cover on the carb. One screw is longer than the rest, remember where it goes. Carefully remove the cover. There is a large low tension spring under the cover and a rubber diaphragm. You do not have to remove the slide to change the needle but it's a lot easier if you do. Lift the diaphragm out of the groove around the top of the carb. Carefully. lift the slide out of the carb. Down inside the slide, you'll see a plastic needle retainer. Take this out and lift the needle out of the slide. Install the new needle as instructed with your jet kit. Reassemble in reverse order being very careful to insure the diaphragm is properly seated in it's groove around the top of the carb. If not, you will puncture the diaphragm and then have to replace it. It ain't cheap either, Sometimes you have to use just a bit of grease to get the diaphragm to stay in the groove.

While you've got it down this far, you need remove the anti-tamper plug that covers the idle mixture adjustment screw in the event it hasn't been removed previously. Turn the carb upside down and locate a round plug just on the engine side of the float bowl. It is about 1/4" in diameter. Using a small drill bit, carefully drill though this plug. It isn't thick and you just want to drill through the plug, If you put too much pressure on the drill, you will damage the screw beneath it. Just barely drill through the plug. With the plug drilled, insert a small self tapping sheet metal screw. Use a pair of pliers to work the plug out of it's hole. Now, you'll see the idle adjuster screw. Carefully turn it inwards until it seats while counting the turns. Once the adjuster barely seats, turn it back out three complete turns. This is your starting point.

Reinstall the carb with a new carb to manifold seal. Check for the proper throttle operation before starting the engine. Start the engine and allow it to warm up a bit. Adjust the idle mixture screw for smoothest idle and the throttle stop screw so that the engine idle speed is about 1000-1200 RPM.

Good Luck

Apr 11, 2010 | 2003 Harley Davidson FXD Dyna Super Glide

1 Answer

Tt-r 125 e carburetor adjustment My son tried to clean the carburetor and set all the jets and screws tight. What do I set which jet at ?

The air screw and throttle screw are the only settings on the carb. Bear in mind they only screw in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. This is the factory setting. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.

If the screw adjusters were screwed in tight they will likely need to be replaced. The end of the screws will have a depression ring and that little ring can screw up the carb.

Could you take a moment and rate my answer? Thanks!

Sep 25, 2009 | 2004 Yamaha TT-R 125 LE

1 Answer

My honda xr 250 mototrcycle wont idle, i took the carb off to clean it out cuz it had been sitting with gas in it for awhile. so im wondering if when i cleaned it if i changed my jetting?

Cleaning a carb will not change the jetting. The problem is in the pilot jet. This jet regulates the idle. Pull the carb off again and re-clean it. Remove the air screw and the throttle screw and spray carb cleaner into every hole you can find. Pay special attention to the air screw hole. Now put both screws back in the holes they came out of and turn them inward until they LIGHTLY seat. Now back each screw out one and one half turns. You are back to factory settings now. Get the pilot jet cleaned out and the bike will idle.

Aug 08, 2009 | Honda Xr 250 Motorcycles

1 Answer

Engine not running

Your carb should have another jet. What you cleaned was the main jet in the center of the carb. There should be another jet called a pilot jet. Often it has a metal plug covering it up so the setting can not be changed at that point. Instead, they want you to change the setting with the pilot air screw. In each case, if you remove the screw, count the number of turns for removal and put the screw back the same number of turns.

The pilot jet controls the idle. It picks up gas from the float bowl then the gas gets metered by the jet and the air screw then passes through a circuit (drilled passageway), in the carb casing and comes out in the center of the carb close to the needle jet. You will need to get the jet and circuit cleaned.


Jul 08, 2009 | 2006 Derbi Senda SM 125 4T

1 Answer

I need to know how to properly tune my 1988 honda cr carburator any help

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb.

The stock main jet is #165. The number is stamped on the side of the jet. A richer jet would be #168. A leaner jet would be #162. Play with jet sizes to get the best overall performance at mid- range to high speed.
Can I get a “very helpful” rating on this answer?

Jun 08, 2009 | 2002 Honda CR 125 R

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