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[QUOTE="Dan_1989cr125, post: 1358513, member: 106324"]
Hello, I just purchased a new to me yz400f. It is my first 4 stroke but i'm already in love. I have a few questions to ask the brilliant folks who browse these forums. I was driving the bike in my back field lightly for about 20 minutes today 3rd gear low-mid range rpm. when i brought my bike back i noticed vapor flowing out of the radiator overflow! and my exhaust had steam in it! When i opened the radiator cap and looked inside i could see the fins the coolant level was so low. I drained the coolant completely and added new coolant then the same happened again. I checked my oil to see if there was any coolant in it. there was none it was clear as a bell. What could be causing this?

When i touch the throttle it smokes blue. this all happen so suddenly.

Next is there are a few drops of goo that come out ofthe crank breather and a lot of air flow coming out too. the goo looks like the crank oil. is this normal?

I love this website and all the support provided. I'm hoping to learn a few things so that i can begin helping others! thanks again!
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