Question about 2004 Yamaha TT-R 125 L

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What is the proper adjustment for the pilot air screw?

The manual says to count the numbers of turns on the pilot air screw before you take it out. I didn't do that. It also says back it out 2.5-3.5 turns (example). I'm not sure where to set this. Any Ideas?

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Best thing to do is set it at one turn out then ride it and go a quarter turn at a time to find your sweet spot there all different you need to adjust it to your style of riding and your bike

Posted on Jun 23, 2009

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1 Answer

How many turn it take on the air mixture screw to get my 2010 Kawasaki 360 4x4 to start?


For the initial settings - 03-12
- lightly seat the pilot all the way to the back - lightly, too much torque and you'll ruin the o-ring in there - then back out the pilot screw 1 & 1/2 turns. From there - you let it run for 10 minutes or so and then adjust the idle to 1,300 +/- 50 rpm - turn your handlebars left and right after adjustment of the throttle lever to make sure it's okay and not binding up - and do your adjustment from the throttle stop screw. According to the specs, once you set that pilot at 1,300 +/- the rest of the adjustment is done with the throttle stop screw. If you do all that and it's still not picking up fuel - definitely give the intake/carb boot a good look over for any cracks or anywhere vacuum could escape - and if it still doesn't pick up the fuel - give the throttle set screw a turn or two. Had a 2000 Yamaha XT225 carb I rebuilt a few weeks ago - adjusted everything as instructed - but it wasn't picking up the fuel. I gave the throttle set screw about a 1/3 turn in to put a little nudge on the throttle and it fired right up. All The Best and Good Luck - Justin Lee, 17 South Industries, LLC

Apr 30, 2016 | kawasaki 2010 Prairie 360 4x4

1 Answer

Front plug turning black rough ideling ?


If by black you mean sooty then it is running too rich.
Check your air filter, although all plugs would be sooty if it was blocked or restricted.
Try a new plug or swap plugs over to eliminate a dodgy plug. Check coil resistance (primary and secondary) to see if it is not breaking down.
If you can get to the air/fuel adjustment screws do the following:
1. On the properly running plug carefully screw in the adjustment screw until lightly seated. Do not over tighten, just til it seats. As you are doing this count the number of turns you have done. I count a quarter turn as 1, so if it goes in one and a half full turns I will have counted to 6. I find this more accurate than the number of full turns. Now unscrew it the same number of quarter turns and it will be back where you first started.
2. On the screw that adjusts the faulty plug, again count the number of quarter turns to a light seating. Usually it should be the same as the other but not always, although it shouldn't be that far away. Back it off to the same number of quarter turns as the first one was set.
Now try running the bike and see if there is any improvement. If it is worse adjust it back to its original setting.

Jul 26, 2015 | Motorcycles

1 Answer

How to adjust carb on honda xr600r


Hi, the adjustments for this bike are as follows: - Pilot air screw turn gently inwards until it stops (do not over tighten as it is easily damaged). Now turn Pilot air screw 2 and five eighth's turns out. Float height is 14.5 millimeters. Idle speed is 1300 rpm plus or minus 100. You can download free service and repair manuals for this bike from the web.

Jan 28, 2014 | 2005 Honda CRF 100 F

1 Answer

Carburettor adjustments


It sound like the choke is stuck on or the pilot air screw is crudded up. Before removing pilot air screw make sure you know how many turns out it has to be adjusted to. Remove and clean the screw make sure the small hole this screw works with in the carb is not clogged. A thin brush fibre can be used to check this (do not use any thing metal). If necessary use a carb cleaner to remove any debris. Replace the pilot air screw very gently screw/turn into the carb until it becomes firm do not tighten any further. You now need to turn it back the number of turns the manufacturer states in the service manual.

Check the choke operation and make sure the cable/operating mechanism is/are working freely. What ever choke type is fitted in the carb i.e. slide, butterfly valve etc. it must work freely.

Jan 27, 2014 | Motorcycles

1 Answer

2008 Honda NXR Bros carburetor settings


Hi, Anonymous it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
How To Carburetor Idle Pilot Screw Adjustment Honda XR70
Pilot Air Fuel Screw Adjustment Explained
http://www.emmy-tech.com/honda-bros-repair-manual.pdf
http://www.partsfish.com/page/oem-parts-for-honda
Honda NXR125 BROS KS Owner Manual


Aug 31, 2013 | 2008 Honda NXR Bros

1 Answer

The proper air-fuel mixture of honda CB 100@


Hi, Anonymous it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://www.motorcycleforum.com/129-first-bike-new-rider/103239-adjusting-old-honda-carb.html
Pilot Air Fuel Screw Adjustment Explained
http://www.dotheton.com/downloads/Honda%20CB100%20CB125%20CL100%20SL100%20CD125%20SL125%20Workshop.pdf
https://www.partsfish.com/page/oem-parts-for-honda
Honda CB Owners Manuals

Feb 20, 2013 | Honda CB 100 Motorcycles

1 Answer

Bajaj ct100 caruratoa setting air & idle screw


Hi, Anonymous I am sorry you can't find the first and best tool you ever bought for your Bajaj but despair not for a mere $0 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
Pilot Air Fuel Screw Adjustment Explained
Two Stroke Scooter ATV Carburetor Settings And Adjustments 1of4 Basics...
DOWNLOAD BAJAJ CT 100 SERVICE MANUAL
http://www.marutibajaj.com/pdf/ct100.pdf
Bajaj Auto Ct 100 2015 User Manual

Sep 07, 2012 | Bajaj CT 100 Motorcycles

1 Answer

1996 Honda XR 600 R air screw adjustment


Hi, Anonymous it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
How to fix those XR600R carb issues Deathridge
Pilot Air Fuel Screw Adjustment Explained
1985 1990 Honda XR600R Service Repair Manual Download 1985 1986 1987 1988... $15
http://www.partsfish.com/page/oem-parts-for-honda
http://mybikemanuals.com/honda/honda-xr-owners-manuals

Feb 20, 2012 | 1996 Honda XR 600 R

1 Answer

Carbs cleaned but bike will not idle properly


The pilot jet controls the idle. Check your service manual for the jet location. Chances are the jet is plugged up by varnish. Count the number of turns as you turn the adjuster screw INWARD until it LIGHTLY seats. Now remove the adjuster screw. Clean the jet and then put the adjuster screw in and LIGHTLY seat it. Turn the adjuster out the same number of turns as originally counted. Don't seat the screw too tight because you can screw up the jet if you do. Remove the actual jet only if you must.

Please rate this answer. Thanks Shawn! Good descriptions :)

May 02, 2009 | 2001 Honda VT 600 C Shadow

1 Answer

Stalls out when choke off and reverse light blinks


The pilot jet is plugged up. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. remove the carburetor from the engine.

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. About 3/8" from the main jet you will see a small brass screw. This is the pilot jet adjuster. Turn the adjuster 1/2 turn counter clockwise. Make a scratch on the casing around the adjuster so that the scrach lines up with the slot on the screw. From this point, carefully count the number of turns until the adjuster can be removed. Spray carb cleaner into the jet then replace the adjuster using the same number of turns such that the screw slot lines up with the scratch mark.

< < READ CLOSELY > >
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. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Apr 29, 2009 | Yamaha YZ 450 F Motorcycles

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