Question about 1987 Yamaha YX 600 Radian

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Have gas getting into crankcase, what would cause this? petcock?

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Hi ,,,a petcock that is not closing can cause this, also if there is gunk in the carbs in the float needles,,will also cause this.

Posted on Mar 23, 2011

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If your Radian has a vacuum operated petcock...inspect diaphram on petcock for leak allowing fuel to travel down vacuum line when engine off.

Posted on Apr 05, 2011

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1 Answer

Gas going into crankcase


Hi, Hb there are three ways in which gas can get into your oil tank/system:
1. Someone deliberately pours gas into your oil tank.
2. The vacuum petcock control rubber fails, which allows gas to flow from the fuel tank through the petcock, through the vacuum line into the intake manifold, then into the combustion chamber, where it seeps past the piston rings and into the bottom end where it gets pumped back into the oil tank.
3. Nonvacuum petcocks that are not turned to the off position will patiently wait until the float needle and seat no longer function properly thus inviting gas to enter the combustion chamber eventually finding it's way to the oil tank.
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.
http://www.kawasakimotorcycle.org/forum/kawasaki-streetbikes-sportbikes/130968-gas-crankcase-oil.html
Gas leaking into crankcase
Gas fuel in crankcase

Nov 12, 2016 | Motorcycles

1 Answer

Bandit 1200 oil in crankcase


No i would not expect it to, if anything blocking the vent hose to the gas tank would cause a vacuum and stoping fuel from flowing as easy , most likely a faulty fuel pump diaphram or incorrect float height.

Feb 22, 2012 | 2001 Suzuki GSF 1200 Bandit S

1 Answer

What would cause oil to get in the air filter? Also, what would cause the front tire to wear unevenly.


Uneven tire wear is caused by running with the tire pressure too low. Often 35 PSI will keep the tire wear more even. If you ride a long distance with a strong cross wind you may notice wear on the windward side of the tire (just off center). This is because after riding in the crosswind for a long period of time you have been leaning into the wind and are wearing the tire off center.
Oil on the air filter typically is coming from the crankcase breather. Check your oil, it is probably contaminated with gas from your tank and the oil needs to be changed as well as your air filter.
If you have a vacuum style fuel petcock , the vacuum diaphragm has a hole in it. The gas leaks past the diaphragm, down the vacuum line, into the intake manifold, into the cylinder, past the piston rings, and into the crankcase where it mixes with your oil.
If you have a standard on / off style petcock, all you have to do is leave your fuel on and have a float needle stick in one of you carburetors. The result is the same , the crankcase fills with all your expensive gas from the fuel tank. This can happen to any motorcycle that is in perfect order.
If the four hole washer in any style petcock gets worn (thin or torn) , that can be the cause of a fuel spill into the engine. Always turn your fuel petcock off when not riding.
Start with a thorough inspection of your fuel petcock for bad rubber parts. Replace any bad parts with new. K&L makes after market fuel petcock repair kits if you just want to rebuild . If money is no object a brand spanking new fuelcock will work for sure. If running a quality fuel system cleaner like "Chevron Techron" does not stop the carburetor float needles from sticking, your may have to disassemble the carburetors and clean them properly and replacing the float needles during the process.

Apr 17, 2011 | Suzuki GSX 600 F (Katana Motorcycles

2 Answers

About after a min of the bike running gas starts flowing into the air box, its alos getting into th oil


First check to see if the oil level in your crankcase is too high. If you have a vacuum petcock malfunction (hole in the diaphragm) or if the fuel petcock is left in the prime position and a float needle sticks, then you get you get gas running into the cylinders, past the rings, and into the oil.
When you start your motorcycle the oil/gas mixture has no place to go, the crankcase is too full, and the mixture exits through the crankcase breather into the air box where it will ruin a paper air filter. Always turn your fuel petcocks off when not driving. If the petcock diaphragms are bad rebuild the petcock with K&L rebuild kits or replace the fuel petcocks with new ones. If the float needles in the carburetors are bad or sticking, take the carburetors apart, clean them, and replace any worn or damaged parts You will have to change your gasoline saturated oil for it will no longer properly lubricate your motor.
Just a note: in 1983 brand new Honda's would fill there engines in gas. All the components were clean and new. This can happen to any machine in any condition at any time. When not riding always turn off the fuel vales never leave them in the prime position.

Mar 21, 2011 | 1982 Yamaha XS 400

1 Answer

Xj600s diversion 1996, oil in the airbox? Why?


First check to see if the oil level in your crankcase is too high. If you have a vacuum petcock malfunction (hole in the diaphragm) or if the fuel petcock is left in the prime position and a float needle sticks, then you get you get gas running into the cylinders, past the rings, and into the oil.
When you start your motorcycle the oil/gas mixture has no place to go, the crankcase is too full, and the mixture exits through the crankcase breather into the air box where it will ruin a paper air filter. Always turn your fuel petcocks off when not driving. If the petcock diaphragms are bad rebuild the petcock with K&L rebuild kits or replace the fuel petcocks with new ones. If the float needles in the carburetors are bad or sticking, take the carburetors apart, clean them, and replace any worn or damaged parts You will have to change your gasoline saturated oil for it will no longer properly lubricate your motor.

Mar 08, 2011 | 1996 Yamaha XJ 600 Diversion S-N

1 Answer

I just bought a 1985 xj700. is the air filter supposd to be saturated with oil? if not, whht causes it?


If you have a vacuum petcock malfunction (hole in the diaphragm) or if the fuel petcock is left in the prime position and a float needle sticks, then you get you get gas running into the cylinders, past the rings, and into the oil. When you start your motorcycle the oil/gas mixture has no place to go, the crankcase is too full, and the mixture exits through the crankcase breather into the air box where it will ruin a paper air filter. Always turn your fuel petcocks off when not driving. If the petcock diaphragms are bad rebuild the petcock with K&L rebuild kits or replace the fuel petcocks with new ones. If the float needles in the carburetors are bad or sticking, take the carburetors apart, clean them, and replace any worn or damaged parts You will have to change your gasoline saturated oil for it will no longer properly lubricate your motor.

Mar 07, 2011 | 1985 Yamaha XJ 700 X Maxim

3 Answers

Fuel mixing with oil in crankcase


Answer #1 is spot on! Get the carbs professionally cleaned and set. They will inspect the needle/seat assemblies (or SHOULD) and replace as necessary.

Jan 16, 2011 | 1999 Suzuki GSX-R 600

1 Answer

I have fuel in my oil pan, where is this leak coming from?


If you have a vacuum style fuel petcock , the vacuum diaphragm has a hole in it. The gas leaks past the diaphragm, down the vacuum line, into the intake manifold, into the cylinder, past the piston rings, and into the crankcase where it mixes with your oil.
If you have a standard on / off style petcock, all you have to do is leave your fuel on and have a float needle stick in one of you carburetors. The result is the same , the crankcase fills with all your expensive gas from the fuel tank. This can happen to any motorcycle that is in perfect order.
If the four hole washer in any style petcock gets worn (thin or torn) , that can be the cause of a fuel spill into the engine.
Start with a thorough inspection of your fuel petcock for bad rubber parts. Replace any bad parts with new. K&L makes after market fuel petcock repair kits if you just want to rebuild . If money is no object a brand spanking new fuelcock will work for sure. If running a quality fuel system cleaner like "Chevron Techron" does not stop the carburetor float needles from sticking, your may have to disassemble the carburetors and clean them properly and replacing the float needles during the process.

Jan 15, 2011 | 1999 Suzuki GSX-R 600

2 Answers

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


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.


May 31, 2010 | 1994 Yamaha FZX 750

1 Answer

Petrol in crankcase


  • The only way petrol can get into the crankcase is through the carbs and then into the cylinder and past the rings.
  • Drain the gearbox and put in some fresh oil.
  • Turn the fuel petcock to OFF.
  • Drain the carbs then remove the water trap bowl from the petcock. Does some fuel still get past the petcock valve? Replace the petcock if it does. If the petcock is working properly then remount the bowl.
  • From this point forward, ALWAYS shut the gas off when the bike is not running.
  • Please rate this solution as a " FixYa ". Thanks!

Mar 17, 2009 | 1986 Yamaha FZ 600

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