Question about 2002 Yamaha Xv 250 Virago S

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Gas in oil - Yamaha Virago 250 2006

I keep ending up with fuel in my oil when I change it. I thought the problem was over-use of the choke so I quit using the choke to warm it up but the fuel leak is the same. Carb problem or cylinder problem?

It runs great regardless, I've just been changing oil excessively out of fear of grinding something.

It's a Virago 250 from 2006

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Your carb. is flooding the cylinder when its not running.it will cause ring damage.turn your gas pitcock off when not in use.get carb cleaned &adjusted.

Posted on Apr 23, 2009

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Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
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For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
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Husqvarna 223l starts but quits before I can even get the choke off, then will not even start again. Has been great until this.


I can assure you it wont be leaking oil, as the only oil it uses is mixed with the fuel.

Lock throttle trigger on,
Start on full choke till it fires,
Switch to half choke and it should fire up on high revs,
Blip the throttle and it should turn to tick over.

If it still keeps cutting out it could point to a carb or fuel takn issue.

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Hi, Duce420666 and the usual suspects are:
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2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
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11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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Hi, Edward and the usual suspects are:
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2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
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8. Air/fuel mixture screw set too lean.
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10. Slow fuel jet clogged.
11. Faulty fuel pump.
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1 Answer

The weed cutter will run ok on half choke but stop if choke is turned off to get full rpm,s


In most cases , if your having to use the choke to keep it running after it is warmed up, it could be the fuel filter needs to be changed. That is the first step. The choke is designed to shoot fuel into chamber a the engine warms up, the choke should go off. If a fuel filter is partially clocked it will restrict the fuel to flow freely to the engine. That means the choke has to do exactly that choke the engine. So herenis what I would do if it was mine, replace the fuel filter, air filter and make sure you good full oil and specially fresh gas. Not gas that has been sitting around in a can or tank all winter. Thanks mike

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21 hp kawasaki stalls and floods carb when put under load new plugs, new filters, oil change, new coils new $400 carb what can it be ????


Seems odd that after changing carbs you have this symptom but a dirty air cleaner or restiction in the air intake ducting can cause this. I note you said you changed the air filter(s). I am assuming you changed both the paper and foam filters. My thoughts are maybe there is some gasket material partially blocking the intake under the carb so when under load it is acting like the Choke is on. ( Before you go lifting off the carb.. a partially engaged choke valve will do the same thing. It will run just fine at low speeds or little load but when you put a heavy load it will choke out / get too much fuel.

Last thing that can cause the engine to act really weird is that the gas cap is vented and if the vent is clogged in the gas cap it will cause very unstable operation of the engine at higher rpms.

Your engine service manual is here:
http://www.smallenginewarehouse.com/images/manuals/FH641-Service.pdf
Carb informationis in section 2 - 8

I reommend you inspect
- the tank cap (no plastic bag in place of the rubber under the gas cap to prevent the tank from leaking)
- the choke linkage and position of choke valve (Off or partially on?)
- screen if any under the air filter (Thinking out of the box... what if the air filter is being drawn against the air cleaner / filter housing causing a choke situation under load)

Don't do this for very long but try a high load test with the air filters removed.

One last dumb thought is... the fuel pump is ported to the engine crank case breather. If the diaphragm fails it can put fuel in the oil which will cause the oil level to rise due to the added gas and then end up over pressurizing the crank case. (You said you changed the oil.. and I would think the oil level is still the same as it was post oil change.)

Those are my thoughts and recommendations for the moment. If anything else come to mind I will send you another post.

If you have questions feel free to ask. I wll tell you that I am using the service manual and my 40 + years of experience to help you.

Thanks for choosing FixYa,
Kelly

Mar 28, 2011 | kawasaki Fh641v 21hp 21 Hp Riding Lawn...

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