Question about 1989 Yamaha Xv 250 Virago S

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Bike starts and runs ok but wont rev out .Thanks in advance

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I took mine apart to clean the varnish out of the carburetor. Re-assembled and installed. Would not rev off of idle. Struggled with the main jet, thinking that was the issue. NOT. Found it to be the brass sleeve that surrounds the main needle (slide needle). The brass sleeve was not lined up correctly. It MUST be lined up with a small pin at the bottom of the casting. Once I got that lined up correctly, runs great! Fuel was not being pulled through the main jet since the fuel port on the slide-sleeve was improperly aligned.

Posted on Jun 28, 2013

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Check the air filter is not obstructed or dirty. if thats ok then it is more than likely the carbs that need attention/resetting/cleaning out

Posted on Mar 15, 2011

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1 Answer

WONT REV ABOVE 3500 RPM


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Hi, Anonymous and the usual suspects are:
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1 Answer

When the bike is cold its starts up then wont hold the revs and cuts out.after several attempts it will hold the revs and works ok.


Your choke or cold start needs adjusting slightly.

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2 things need to be done first start your bike get a can of wd40 after your bike is warm and running spray around the carb jointsall 4 of them if your engine changes rpms up or down you have a intake leak ether your carb joint gaskets or o-rings need replacing or your carb joints are old and need replacing. at this point wont hurt to have you carbs cleaned also

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check ur valves and the gaps, try checking ur spark pug gaps

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