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Tune carburetor for rs250

How to set needle for lean or rich.

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If adjuster screw is towards the front half of the carb, clockwise = lean, anti-clockwise = rich. If screw is towards back half of carb, clockwise = rich, anti-clockwise = lean. Make small adjustments. If you can't get good results then change pilot jet.

Posted on Nov 26, 2013

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First make sure metering is set at the correct height. Depending on carburetor seat the mixture screws then turn 1-1/2 CCW as initial mixture setting. Once your engine is running and warmed up tune the idle mixture first half between too lean and too rich then do the same with the high speed at full throttle. Warning if the top speed exceeds the design top speed enrich to slow down. To set the max top speed it is best to a tach designed for small engines.

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Instructions

1

Fine tune your motorcycle before rejetting your carburetor. If it's still running too lean, you can replace the pilot jet as a first step
2

Remove the bowl at the base of the carburetor by unscrewing the screws holding it in place. Unscrew the pilot jet inside, but be careful not to strip it. The jet size will be on top.


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Use a screwdriver to remove the main jet from the brass jet needle holder, which is also called the emulsion tube.
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Put in a pilot jet that is one size larger. Replacing it with a jet two sizes larger will make your mixture too rich.
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Tune the slow/idle settings before replacing the main jet. Replace the main jet with one size larger. The sizes are in increments of 5.
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Put the bowl back on, and align the accelerator pump shaft and rubber boot.
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I have 1994 fxdl the plugs keep getting caked with black soot and fauling out which makes me believe its running to rich, its also backfiring,thru carb and exhaust, i want to know how to lean it out


Before I can tell you how to lean your carburetor out, I need to know what kind of carb you have. But, there are other possible causes for your problem. The factory usually jets the original Keihin CV carb too lean to meet EPA emission requirements. The most probable cause is running the enricher too long while warming the engine up. The enricher on any carburetor provides an extremely rich mixture. So rich that it will foul plugs if allowed to run for too long. You should only use the enricher long enough to warm the engine to the point to where you can keep the engine running with the throttle grip. Once the engine will run with the throttle grip, simply idle the engine up and use the throttle grip lock to hold the throttle at this setting and push the enricher knob in. Other causes could be that the needle is not seating properly and allowing the carb to load up with fuel. If this is the case, you should have noticed that the engine is idling extremely rich and poorly. In this case, you'll have to at least drop the float bowl off and replace the needle and check the float setting with the new needle. The Kiehin CV must be positioned on an angle to set the float properly. If you still have reason to think that you need to change your carb's jetting, re-post telling me exactly what carb is on your engine.

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Goldwing's have never been great for fuel economy. You do not mention what your fuel economy is. Plug color is an indicator of how rich or lean a machine is running. Goldwing's will typically range from 30-45 MPG. If it worse you need to look at a tune up. Plugs, fuel filter, air filter, fuel system cleaner, check timing, and dirty oil can affect fuel economy. Your carburetors have metal vacuum slides that require yearly cleaning. That effects throttle response and smooth running. Your manifold has Two halves to it There is a special shape rubber o-ring that seals the two halves. If your o-ring is bad it could cause gas to flood the intake manifold bypassing the carburetors. If some one has rebuilt the carburetors and put carburetors from different years (mismatched) or did not make sure that the jet and needle sizes match that could be the cause of your issues. The carburetors are stamped with an ID number check to be sure they are a matched set. Also the float needles could be worn or leaking and you could be dealing with sunk floats. Remove the carburetors take off the bowls and inspect the needles. Put the floats in gasoline to see if they sink or float, If they sink replace them ethanol is hard on black plastic floats. Make sure your float height is correct, If the float height is incorrect you will run rich and waste fuel.

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Try making small adjustments to the "H" needle. CCW is richer and to rich is better than to lean.
You may also find this helpful
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

A plugged up muffler can also cause slow response and cut power. To rich a fuel/oil mix is usually at the heart of a plugged muffler. HTH
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Check the condition of the fuel line from inside the tank to the carburetor. Check tightness of all screws on the carburetor body. If no help, disassemble the carburetor and check the condition of the pumper valves and diaphragms. If looks dirty, clean with spray carburetor cleaner and blow out with compressed air (don't use cleaner on any rubber or plastic parts). Remove the H and L needles for cleaning and air blast. Preset the needles 1-1/2 turns CCW from CW stops (lightly). If the rubber parts are stiff, re-kit the carburetor. After engine warm--up, set full throttle and adjust H for highest speed, but 4-stroking. It should run smoothly with a light load (cutting). Set L for smooth idle but rich enough to allow the engine to follow the throttle. Set idle speed just below chain movement. Hope this gets you going again.

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The H is for high rpm (Main mixture) and the L is for Low rpm (Idle Mixture). First turn in both screws all the way in and then turn them both out 1 and a half turns. Pump the primer bulb if the equipment has one. Start the engine, once it is idling, turn the L (Idle Mixture) screw out (counterclockwise) from the preliminary setting until the engine speed decreases (rich). Note the position of the needle. Now turn the adjusting needle in (clockwise). The engine speed may increase, then it will decrease as the needle is turned in (lean). Note the position of the needle. Set the adjusting needle midway between the rich and lean settings as in the picture below. Don't touch the throttle during this procedure. Once you have found the best idle speed for the engine then you need to adjust the high rpm. This process is the same as with the idle rpm process but you need the to hold the throttle wide open while you are adjusting the H (Main Mixture) needle on the carburetor.

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