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XV250 Carburetor/Fuel Issues (Always too rich!)

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XV250 Carburetor/Fuel Issues (Always too rich!)

PostAuthor: jchevin » Mon Jul 06, 2020 5:53 am

Hey all!

I have just wrapped up a virago 250 project, and have been hitting my head against the wall with the carburetor....

So the issues:
-Always seems to run too rich.
-It starts cold without choke
-Pops and backfires when revvd up with accompanying black smoke on the pops.
-Plugs keep being blackened with carbon.
-Usually idles fine though.

The ugly:
its not a genuine Mikuni carb..... its an "exact" brand replica carb, but is brand new.

What ive tried:
Ive tried setting the air-fuel mixture screw to 2 turns out, and it will only run "close to ok" if the needle is screwed all the way in. With the screw all the way in, when warm, it will idle and run ok, but have not had the chance to take it on a ride to really test it.

The dilemma
I have taken the carb apart, and used carb cleaner to check absolutely all jets and needles, im a bit stumped as to what this could be.

I could buy a second hand mikuni carb, but run the risk of this being something else... but I defer to those on the internet wiser than myself!

Any suggestions would be great!

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Bike year & model: 1991 xv250 virago
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Re: XV250 Carburetor/Fuel Issues (Always too rich!)

PostAuthor: bstig60 » Mon Jul 06, 2020 10:13 am

The Chinese replica carbs are usually just so much junk. Get a stock Mikuni carb. If your are turning the pilot screw all the way in and it runs better, either the pilot screw is deformed or the O ring is ruined.
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

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