Question about 2005 Yamaha Xv 250 Virago S

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Rich mixture virago xv250

I need to adjust the carburetor on my virago to make the fuel leaner. I dont know where the screw is that controls the air-fuel mixture. i have found the throttle control screw but doesnt alter the mixture. thanks

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  • Anonymous Mar 15, 2014

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Http://www.stadiumyamaha.com/pages/parts/viewbybrand/2/Yamaha.aspx

look up your bike here and i think it is number 13 on the diagram. which looks like its right by where the throttle cable connects

Posted on Mar 24, 2009

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Mixture screw adjustment on a ford maverick 1990 how to reset it ?


turn allen 3/32 allen mixture screw for each barrel counterclock wise for leaner fuel mixture if turn mixture screw clockwise richen fuel mixture.

Jul 13, 2013 | Cars & Trucks

1 Answer

Starts on full choke but stalls when moved to 1/2 - can play with it to keep ig going for a min or two but dies out.


When you go from full choke (rich air/fuel mixture in carb) to half-choke (leaner air/fuel mixture), you are requesting the engine to do more with less. This is a very common problem. You say it dies out. It is probably at that point dying out "lean" with a lot of air and not very much fuel. Several things can cause it to die out. Bad fuel filter in gas tank, debris in the carburetor fuel inlet screen (small wire mesh filter)...or it could just need the L mixture screw adjusted which afftects how rich/lean the engine is at startup. Since it is dying lean, I suggest turning the L (Low speed) mixture screw counterclockwise to increase fuel flow at startup. Turn it about 1/4 of a turn. If this allows it to keep running, then good. The L and H mixture screws have unconventional heads on them that require a special tool, but you can make your own with a small 22 gauge automotive-type female spade connector. Just tap it down onto the head of the L screw (one closest to engine below the idle speed screw) insert a flat blade screwdriver, and you should be able to turn it. If adjustment does NOT help the dying problem, then the installation of a gasket and diaphragm kit is probably the next step. Good luck, and you are not alone, there are hundreds of these machines that do this.

Aug 14, 2011 | Poulan Garden

1 Answer

I have a Trimmer SS30. When I run it I must keep choke at half setting with full gas. If I put it on run it stops. After awhile even on half choke it stops.


You probably just need a carburetor adjustment. At half-choke the engine is getting an overly rich fuel mixture. This is normal procedure during warm up, but after a couple of minutes, a leaner mixture is needed. That is where adjusting the carburetor comes in. It probably has a Zama or Rueiing carburetor. I use small automotive type wire connectors (plastic) and lightly tap them onto the irregular heads of the adjusting screws. These are marke L and H respectively on the carburetor. The L screw is always closest to the engine. Here is how to make the proper adjustments. If this doesn't work then a good cleaning and/or rebuild of the carb will be needed. They periodically need this done at any rate after a couple years or so. Please view this:
http://www.zamacarb.com/tipspage.html

Feb 17, 2011 | Ryobi Garden

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