Question about Suzuki RM 250 Motorcycles

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1990 rm250 air screw settings i took the screws out to clean the carb but lost the paper i wrote the turns on can anyone help

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: looking for the air fuel mixture screws on carb any help?

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Posted on Apr 09, 2009

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SOURCE: SPEED IDLE SCREW AND MIXTURE SCREW SETTINGS MY

ALWAYS have a fire extinguisher on hand when working on carburetors. Drain the carburetor. There should be a plug on the bottom of the carb float bowl. Remove the plug 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. Remove the air screw on the outside throat of the
carb and spray into the screw hole as well. Be sure to put the air screw back in. IMPORTANT > do not tighten this adjuster down. Only screw it in until it LIGHTLY seats. Now turn the air screw 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.
Can I get a “very helpful” rating on this answer?

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Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part and/or the notation "Not Available" is in the description, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Posted on Aug 17, 2009

mxtras
  • 194 Answers

SOURCE: how dose air screw work on carburetors, is it

If the screw is on the air filter side of the slide of the carb then it regulates air and screwing it in will make the idle circuit run richer (more fuel, less bleed air). If it is on the engine side of the slide then it regulates fuel and screwing it in will make the idle circuit run leaner (less fuel).

Posted on Nov 02, 2010

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1 Answer

Can anyone tell me the location of idle adjustment screw on 1990 4-runner v-6


If it's fuel injected, look on top of throttle body for a large screw that accepts a flat blade screwdriver. adjust by turning screw out slightly to increase RPM's;in to decrease. Unlike a carb stop screw, it's a jet controlling flow of air @ idle.

May 04, 2014 | 1991 Toyota Pickup

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Is there a starting point for the three adjusting screws on the carb?saw is a mac 3516 35cc. i need a good starting point to get the saw running.


Hi kwismer1...
The saw was running good when new, the adjustment screws cannot get turned in or out because of the spring so that will be your starting point.
If you have not already tried to adjust the screws...you can do it an easy way to make sure you get it right.
Screw the adjustment screws all the way to lightly bottom out the adjustment screws...
Then you count and mark down on a piece of paper how many turns it took you to bottom each of the screws....then remove them and clean your carburetor,repair,etc...when you go to put them back in, you bottom them first, and then turn the screw to the number of turns from the bottom that you wrote down.
Please take time to rate me

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1 Answer

Hey just wona know where the air mixture screw on my carby should b set at coz i jus bought the bike n found the screw is wwound all the way in wot should i do


Most air mixture screws you never have to mess with. In your case, someone else decided to do this for you. First, if your bike is running rough, make sure you do a THOROUGH cleaning of the carbs so that when you DO set the air mixture screw, it will do its job correctly. The normal procedure for the air screw is to start with the screw a few turns out (counting exactly where you are starting from) For this particular bike, lets say 2 full revolutions. Now, with the bike running, (it should be able to run as long as the carbs are clean) screw the mixture screw out however many turns it takes until the motor stumbles a little. This can be hard to hear sometimes, so you may have to repeat this step. When it stumbles, record how many turns it took. So, for our example, 2 turns, plus you turned it out another 2 turns, making it "stumble" at 4 turns out. Now, reset the mixture screw to 2 turns out. Do the opposite and screw in now, making note of when it stumbles again. lets say it stumbled at 1 turn in. Now we know that the best possible solution is to put the air screw between 1 turn and 4 turns out, which means you should set it at 2.5 turns out (which is half way between 1 and 4 turns out). After all of that is done, you will want to double check the synchronization of your carbs to make sure they are all within spec of eachother. I hope this helps.

Bruno

Nov 16, 2010 | Suzuki RM 250 Motorcycles

1 Answer

I just bought a 1978 650b.It needs alot of tlc.carbs look clean when i took them apart.looks like a pretty good set of points.bought brand new plugsit doesn't want to idle below 1500 rpm by it self.idle...


Replace the pilot and main jets then really clean the carbs soak them in a good carb cleaner. When you re assemble the carbs make sure you have the air screws turned all the way in then one full turn out start from that setting.

Jul 19, 2010 | 1977 kawasaki Z 650

1 Answer

Kelhin 40mm cv carburettor harley 1200 xls


No sweat. Screw the idle mixture screw in until it "bottoms out". Do not tighten or you will damage the screw. Back the idle mixture screw out about three turns. Install carburator and check for proper operation.
When you get the bike running, allow it to warm up and then adjust the mixture for highest smoothest idle. Set idle speed to about 1000 rpm with the throttle stop screw.

Oct 06, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

SPEED IDLE SCREW AND MIXTURE SCREW SETTINGS MY BIKE RUNS FOR SO LONG CUTS OUT BUT STARTS BACK UP AGAIN FIRST KICK WOTS MY PROBLEM suzuki rm250 1993


ALWAYS have a fire extinguisher on hand when working on carburetors. Drain the carburetor. There should be a plug on the bottom of the carb float bowl. Remove the plug 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. Remove the air screw on the outside throat of the
carb and spray into the screw hole as well. Be sure to put the air screw back in. IMPORTANT > do not tighten this adjuster down. Only screw it in until it LIGHTLY seats. Now turn the air screw 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.
Can I get a “very helpful” rating on this answer?

a32d5e0.gif
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part and/or the notation "Not Available" is in the description, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Aug 17, 2009 | Suzuki RM 250 Motorcycles

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.

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

2 Answers

Hyosun Scooter Carb Adjustments


Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. 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.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

A “very helpful” rating for this answer? Thanks!

Jun 27, 2009 | 2002 Hyosung Comet 125

1 Answer

1992 Suzuki rm250


ALWAYS have a fire extinguisher on hand when working on carburetors.
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. Turn the gas back on and wait a minute for the carb to fill with gas. If the bike doesn't start and run properly then shut off the gas and 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. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
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. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. 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!

Jun 17, 2009 | 1993 Suzuki GSF 250 Bandit

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