Question about 2009 Aprilia Scarabeo 500 I.E

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Pilot screw adjustment

Idle problem when cold

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Two Stroke Scooter ATV Carburetor Settings And Adjustments 1of4 Basics...
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Posted on Oct 21, 2015

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Just fitted a new carb to my gilera runner 50cc and now it revs really high on idle


I would check a few things. First off make sure the throttle cable is adjusted correctly. Second, try opening the throttle half way and letting go you should hear the inside parts of the carb click as they seat. Third, find the idle adjuster screw turn this anti clockwise and see if the idle speed drops down. Fourth check the choke mechanism is working properly choke/cold start forces a rich mixture to the engine and increases the idle revs.
it is worth checking the pilot air screw is adjusted correctly. Hope this helps.

Mar 04, 2015 | Gilera Motorcycles

1 Answer

I need to know the proper tuning of ucal mikuni carburetor with mixture adjusting screw on bottom of cabr (beneath float bowl), an idle adjust screw and pilot screw (hopefully pilot fuel screw since s


Why did you need to clean the carb? Routine servicing of the aircleaner would keep the carb clean for life. The pilot screw should be 1.5 turns out approx. with a small adjustment either way. Idle speed is set to a smooth low idle.If this doesn't fix it have you got something in the carb not replaced correctly? The float needle/float assy? How did you clean it? Have you introduced fluff/dirt into the carb and did you blow it clean with an airline?

Oct 09, 2014 | Motorcycles

2 Answers

High Idle when we get the 70cc ATV running


Pilot jet may be t o small or your air screw isn't adjusted right try turning the air screw in all the way then turn out 1full turn test and adjust until it runs good if that doesn't fix it the pilot jet will need to be cleaned or brought up one size hope this will help you good luck

May 24, 2014 | RTO Quads 125cc Full Size Adult 4 Wheelers...

1 Answer

What are the base carb settings for a 2005 honda cbr125R


Hi, Markhull 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.
7. 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.
8. 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 please click on the blue links below. Good luck and have a wonderful day.
Life On 2 Wheels
Pilot Air Fuel Screw Adjustment Explained
Honda CBR125R Owner Manual service
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR125RW Owner Manual

Dec 23, 2012 | 2005 Honda CBR 125 R

1 Answer

My pilot valve needs to be adjusted. it does not idle the engine down.


If the pressure is set about right (cuts out pump at about 125 ), most likely problem is actuator at the engine /governor mech. or idle screw turned in too far. With engine off and about 100psi in the tank, flip unloader lever at pilot valve. Flipping the lever up then down will allow you to watch the actuator in action (take the air filter off at engine). The acutator should not leak air(has oring inside) and should move the governor against speed adjustment screw then away. If no leaks and governor arm moves as needed, adjust idle screw at the carb. Many time the idle screw is adjusted in too far to prevent engine from stoping when cold or other problems cause engine to stall. Good luck

Jul 11, 2011 | Dewalt 5.5HP 8GAL Gas Wheeled Portable...

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

1980 1100, I need mixture screw settings, have set at 2 turns out but am at about 2000ft above sea level so maybe has to be altered slightly? In or out?


First - I do not know this bike specifically, but with 4-strokes the screw usually adjusts the fuel, not the air in the pilot circuit. Keep in mind this screw only adjusts the mixture from idle up to just under half throttle. It won't effect higher engine speed performance.

Basically, you can adjust them in 1/2 turn increments until you get the desired performance. Or, fire it up, and adjust the screws with it idling until you can get the highest, smooth idle - this is likely where it will be best.

Now - if the screws are 'behind' the carb slide (air filter side) they are an air screw. If they are on the engine side of the slide, they are fuel screws - the two work opposite of eachother. They're likely on the engine side of the slide, so screwing them in will lean out the pilot circuit (less fuel). So - if after you adjust the screws as described above, check to see how far out from seat they are. If you are not around 1.5-2.5 turns out, you might consider changing the pilot jets inside the carb.

Nov 12, 2009 | 1983 Suzuki GSX 1100 E

1 Answer

1997 Yamaha XVS 650 Dragstar air/fuel mixture adjustment


Hi, The4gunners 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.
7. 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.
8. 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 please click on the blue links below. Good luck and have a wonderful day.
Pilot Mixture Screws Star 1100 Wiki Knowledge Base
Life On 2 Wheels
Yamaha XVS650 Service Manual
OEM parts for Yamaha
YAMAHA XVS650 Owner Manual

Sep 23, 2009 | 1997 Yamaha XVS 650 Dragstar

1 Answer

How to reset idle mix to factory settings on my 88 suzuki savage ls400


you don't! set pilot two turns out from fully in on carb pilot jet, start engine and set throttle adjuster screw on carb to fast tick over, adjust pilot to get even firing and readjust throttle screw to @1000rpm

Sep 11, 2009 | 1988 Suzuki LS 650 Savage

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