G2 Yahama Gas/mix coming out of oil bypass hose.

Chaddog18 · 03-09-2016, 01:47 PM

I have a Yahama G2 and when I drive it I will get a oil/gas mix coming out of the bypass hose. I also have to run it with the choke on. It won't run with choke off. Any help would be great. I did that the air filter box out and got a different filter and I have a catch can for the bypass hose.

slonomo · 03-09-2016, 09:41 PM

Sounds like you have fuel in the oil. You might have a problem with your carb float not shutting fuel off and allowing fuel to build up in the cylinder, eventually getting into the crankcase. This adds volume and the oil has no choice but to make it's way out the breather tube.

spriddle · 03-10-2016, 09:34 AM

I agree with slonomo. Pull the dipstick and see if the oil smells like gas. If so, don't run the engine. You will need to completely flush the engine by changing the oil a couple of times after you get this issue solved. Change the oil, run the engine a few minutes and then change it again to make sure all the gas is out (only one quart: 10w30).

03-09-2016, 01:47 PM	#1
Chaddog18 Not Yet Wild Join Date: Oct 2015 Posts: 3	G2 Yahama Gas/mix coming out of oil bypass hose. I have a Yahama G2 and when I drive it I will get a oil/gas mix coming out of the bypass hose. I also have to run it with the choke on. It won't run with choke off. Any help would be great. I did that the air filter box out and got a different filter and I have a catch can for the bypass hose.
Chaddog18 Not Yet Wild Join Date: Oct 2015 Posts: 3

03-09-2016, 09:41 PM	#2
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,441	Re: G2 Yahama Gas/mix coming out of oil bypass hose. Sounds like you have fuel in the oil. You might have a problem with your carb float not shutting fuel off and allowing fuel to build up in the cylinder, eventually getting into the crankcase. This adds volume and the oil has no choice but to make it's way out the breather tube.

03-10-2016, 09:34 AM	#3
spriddle Admin Join Date: Dec 2006 Location: TN Posts: 101,871	Re: G2 Yahama Gas/mix coming out of oil bypass hose. I agree with slonomo. Pull the dipstick and see if the oil smells like gas. If so, don't run the engine. You will need to completely flush the engine by changing the oil a couple of times after you get this issue solved. Change the oil, run the engine a few minutes and then change it again to make sure all the gas is out (only one quart: 10w30).

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