Question about 1994 Yamaha FZX 750

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What would cause gas and oil to come out of the air filter

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Hello check your engine oil level to see if it is over filled.
Also if it is smell it to see if there is gas in the oil.
what some times happens with older motorcycles the fuel petcock o-ring or diaphram goes bad and fuel will weap into the cylinders and into the crankcase. raising the level and pushing into the air box via the crankcase breather hose.
Also check the vacuum line from the petcock if it has gas in it the diaphragm is leaking.


Posted on Jun 01, 2010

Testimonial: "thank you that worked replaced diaphram. Now its backfiring. What did i do to cause that?"

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Carbs need to rebuilt and or you have jumped timing or a bad valve in the motor.

Posted on May 24, 2013

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1 Answer

My lawnmower is fuming when i start it. what is causing it?


Is the air filter clean? Dirty air filter creates a vacuum sucking too much gas.
Is the choke not working properly?
It it's black smoke it's burning too much gas.
If it's blue smoke it's oil. If it's oil smoke did you over fill when you put oil in.
Over filling the oil will cause it to smoke.
Bad piston rings will cause the oil to burn also.

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Why does the Gas mix with oil


These are the two simplest causes:
crankcase overfill situation . . check oil level and adjust as needed.
air filter blockage causing the engine vacuum to draw from the crankcase breather and the engine oil with it.

Jul 06, 2014 | Dewalt DPD3100 Gas Pressure Washer

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Blowing oil


This normally happens if the oil is overfilled. Try checking your oil level to see if its above the recommended amount. This can also be caused by oil entering the carburetor, be sure to check your carburetor as well.

Feb 15, 2013 | Air Tools & Compressors

1 Answer

I have a worthington tow behind compressor, and I have a ton of oil mixing in with the air, it makes a huge mess. I have replaced the filter, any other suggestions


you stated you replaced the filter.Was it the separator filter? the separator filter is located inside the separator tank. the separator tank is where you add oil. If this filter is bad it will cause oil and air to mix and get into the air. Also there is a 1/4 inch line that comes from the top of the tank . this line has an orffice in it If the orffice plugs oil can carry over into the air.

Sep 18, 2011 | Worthington Air Tools & Compressors

1 Answer

My airbox is full of oil


Check your oil level. If it is too high, your oil may be full of gasoline. Your vacuum petcock may be leaking gas past a diaphragm or your float bowl needles are sticking and are over flowing gas into the engine. This causes your oil to be diluted with gas, the crankcase becomes too full, and the gasoline diluted oil is then blowing through the breather tube and into the air box. Needles sticking in the carburetors can happen at any time even to new motorcycles. If you have vacuum petcocks inspect the vacuum diaphragms for leaking. Clean the carburetors and replace the float needles if they show wear. Change the gas fouled oil and filter. Change your air filter if it is paper and has become oil fouled. Hope this helps.

Jun 04, 2011 | 1996 Suzuki RF 600 R

1 Answer

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...

1 Answer

My oil pressure is dropping and at the same time my car is idleing to where it seems like my fuel pump is dying. Are the 2 related. If I step on the gas the oil pressure picks up and the my car gets gas...


Your oil pressure will increase and decrease with the speed of the engine. As long as your oil pressure increases, that's ok. The idle problem could be caused by a dirty fuel or air filter. I would start with replacing the fuel filter and check the condition of the air filter.

May 14, 2010 | 2001 Jeep Grand Cherokee

1 Answer

How do i burp the air out of my gas 1997


oil in the air filter is caused by one of 3 things, excessive oil level in the crankcase or excessive engine cylinder leakage causing to much back pressure and blowing the oil up the and into the crankcase vent hose, this same condition can also be caused by a plugged Positive Crankcase vent system valve. (PCV for short)

Jan 19, 2010 | 1997 Volkswagen Jetta

3 Answers

Generator is burning oil and choking out


You have/had too much oil in it. After it is brought down to proper level, it may have to burn the oil that is in areas that it should not be in. Another thing that may cause this, is a dirty air filter, can cause enough suction to pull oil around valves, and other places a clean filter will not. It may have oil in the filter too.

Dec 19, 2008 | Briggs & Stratton Power Products 5,550...

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