Oil leak Diagnosis & identification help - Honda Rebel Forum
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post #1 of 4 Old 08-29-2019, 01:14 PM Thread Starter
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Join Date: Aug 2019
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Oil leak Diagnosis & identification help

This is my first bike. I’ve been riding it for a month with no issues. Just came back from 2 week vacation with the bike sitting. Found an oil spot on the floor.

Should I be concerned with the oil leak I found on the floor? I found a drop hanging from the photo with the green arrow (Can someone identify that part btw? I assume it should have a tube attached to it. Yes, I obviously need an owners manual).

Checked the oil. It is low.

How do I proceed in self-diagnosing the leak? Is it okay to ride or should I take it right to a shop (it’s my only form of transportation)?
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File Type: jpg AEAB758A-7882-47CC-91D0-90EE6634CBB4_1567098191590.jpg (128.0 KB, 7 views)
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post #2 of 4 Old 08-29-2019, 01:52 PM
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Location: Monroe, Louisiana
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Welcome. It looks like the carb and possibly the puke tube are leaking. The puke tube collects condensate from the engine and should be drained when the oil is changed. It is normally plugged, which keeps unfiltered air from getting sucked into the engine. Some forum members have replaced the plug with a removeable cap or valve, which makes draining it easier. If there is a plug in one of the tubes, then it may be leaking out of the duckbilled tube, which is normal.

Are you turning the fuel valve to the off position when parking the bike? If not, be sure to check the oil level before riding. With the valve on, if the carb float valve sticks, it allows the carb to overfill, which will result in gas coming out one of the tubes in that cluster and possibly reaching the crankcase, diluting the oil.

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post #3 of 4 Old 09-11-2019, 05:01 PM
Join Date: Mar 2019
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What climate are you riding in? This could be water condensation mixed with oil coming from the crankcase vent. Does the spot evaporate eventually? Recently I towed a motorcycle on a trailer i have a Ram 5500 truck which i use for toewing. the bike owner was not riding a bike cause of oil leaking so he called a towing service. i bring that bike to the mechanic shop.
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post #4 of 4 Old 09-11-2019, 05:58 PM
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Location: Nevada
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your green arrow appears to point to air fuel screw.. there is an o-ring that seals off the screw..
could be the source of gas leakage, Though I think your problem is a seeping bowl gasket (green box)..

The lower carb half is Filthy, typical of bowl gasket leakage, which appears to be traveling aft covering the air box to carb intake tube and clamp (red circle)...

Second photo looks like oil/gas is traveling down outside of hoses from what I can see..
an unplugged puke tube would also drip..

Is there any oily residue Inside the air box or on air filter?

get a can or two of carb spray and clean off outside, than you may be able to pinpoint the leak area..
My 87 bowl gasket seeps fuel staining lower part of carb, which I spray down once or twice a year..
PS some sprays will react with clear coat on engine case causing it to crinkle and lift..
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