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What plug is this on an ATV?

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Old 12-30-2012, 04:06 PM   #1
RBoyd0325 [OP] RBoyd0325 is offline
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What plug is this on an ATV?

I have a 1988 Yamaha Moto-4 Big Bear, and when I was working on it one day, i noticed this plug. I had just drained all of the oil out of it, but when i removed the screw, oil came pumping out of it. It looked like motor oil, and not some sort of diff fluid. Im afraid to ride it now because i have no idea how old the oil is, or what it goes to. It almost looks like the transmission. But i dont know how i would change it because i dont know how to drain it or find the drain plug. i need someones expertise, it would be greatly appreciated. thanks
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Old 12-30-2012, 04:14 PM   #2
GO VOLS!
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i’m going to take a guess and say it was trans oil. some atvs/dirt bikes use the same motor in the trans as they do in the motor. i know my honda crf150r uses the same oil in both motor and trans and they drain and fill separately.

also you wont. go down to the local deal and ask the parts guys. maybe they will know or can look at it on the computer. be nice about it and if they are a good dealer they should help you out. and you should not have to take it in.
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Old 12-30-2012, 04:18 PM   #3
RBoyd0325 [OP] RBoyd0325 is offline
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yeah that was going to be a last resort for me, trailering it somewhere. i was so confused on how if it was the same oil, how i could drain the motor oil out, and when i removed that plug, it came pumping out! now whatever it is is low....and i dont know where to fill it up. cause if it pumps out, i would think that means its a low spot, so i dont know how to fill it up.
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Old 12-30-2012, 04:33 PM   #4
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http://www.powersportsplus.com/parts...AFT/parts.html

Looks like a driveshaft breather according to the fiche.
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Old 12-30-2012, 04:43 PM   #5
RBoyd0325 [OP] RBoyd0325 is offline
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So should I worry about keeping it full of oil? Or is it the motor oil that is coming out of there?
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Old 12-30-2012, 04:48 PM   #6
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Quote:
Originally Posted by RBoyd0325 View Post
So should I worry about keeping it full of oil? Or is it the motor oil that is coming out of there?
It's probably a gear oil...was it pumping out fast? or kinda dribbling out? Yeah, I'd keep the oil level up on that though.
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Old 12-30-2012, 04:52 PM   #7
RBoyd0325 [OP] RBoyd0325 is offline
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It didn't look like a gear oil, like you would put in the diff. It was brown and looked just like motor oil. But the spout is angled upwards and when I took it off, it should out pretty fast, like it was the low spot and had a good bit of pressure on it
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