Can you post a photo of it? I don't see anything in the part diagrams, but maybe someone with more experience with that model will recognize it.
Can you post a photo of it? I don't see anything in the part diagrams, but maybe someone with more experience with that model will recognize it.
This is the gearcase vent.... If there is air coming out when you pump it up and it's not plugged, then you do have an air leak and it's leaking into the gearcase.
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That hose goes out behind the motor and it's open to the ground. Normally it would have a T in it from the factory and one end goes up by the airbox and the other end is aimed toward the ground. That way it has two exits to vent the gear case in case one end becomes plugged up
Could be seals, that crack or hole I was talking about or the case half gasket is leaking
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I had that same gasket slip out of place on a rebuild once and it showed up on the leak down test. it does need to be unplugged for a proper test and if you loose pressure, spray soapy water on the suspected spots. Bubbles means an air leak. I suspect the gasket has slipped, they are very narrow in that area. Pull it apart, buy a new OEM centre gasket and lightly lap the case halves to get a flat mating surface......should be good to go.
Ross...
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1985 250R original (Garage Queen)
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Here is where we think the leak is...
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That gasket, the open area to the left is the crank case. The open area to the right is the gear case and that little sliver of gasket is all that keeps one sealed from the other
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ironchop has all the images on this topic =).
I agree, looks like a crankcase vent (well transmission vent in this case since 2 stroke). As stated, there must be a gasket leak in the area I circled in read. Could be as simple as a deep scratch on the center crankcase sealing surface, or maybe a bit of old gasket material left over.
If you could remove the transmission section of the engine to get to the gasket surface, it would bubble where the leak is, but it's internal inside the engine. The fact it leaks out the transmission vent means it's getting into the transmission when it shouldn't be.
Red Rider's Sand Machine Updated 07/23/14
Makes sense, thanks for showing me that. Ive done a few before, but was just trying to avoid splitting the cases. Would the crank seals cause this air to flow out of the nipple, or should my focus be on this gasket? When this nipple is plugged up, I get no drop in psi on the leak test, and of course, when the nipple is not sealed off I can't even get up to 5-10 psi because air is coming out of it too fast.