oil in air box

Information and questions on GL1100 Goldwings (1980-1983)
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Joined: Tue Jul 22, 2014 2:09 pm
Location: Camby In
Motorcycle: 1981 Honda GoldWing GL1100 Interstate

oil in air box

Post by honky4fun » Thu Jul 24, 2014 2:45 pm

I have an 81 GL1100. It is up to date on all standard maintenance. While riding home from church it plumed a huge puff of smoke from the exhaust. I got to looking and found that in the air box under the filter was full of oil. I cleaned it up and road it. After riding it for a bit it starting smoking again. It. Doesn't miss a beat. No sputtering, no misfiring, it don't act up in any way. Any ideas on what may cause this and how to fix it??? Thank you for your time.

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1981 GL1100 Interstate

Re: oil in air box

Post by HawkeyeGL1200 » Thu Jul 24, 2014 4:39 pm

My first reaction to reading this is there is excess crankcase pressure or too much oil in the crankcase. I can't recall if the crankcase vent (on a GL1100) is plumbed into the air filter like on a GL1200.

So, a couple of shots in the dark would be, verify the oil level in the crankcase is not overfull. There are oil canisters on a 1200, that need to be periodically cleaned out to prevent this sort of thing, but they do not fill up overly fast. I don't know if an 1100 has the same set up. Lastly, and the worst case is, you have a broken piston ring or piston rings, causing excess pressure to push oil into the air box.

Just speculating here.. so I hope I'm wrong.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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Re: oil in air box

Post by moffat » Sun Jul 27, 2014 4:28 am

My GL1100 had a crankcase vent into the air intake box if that's a help

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Re: oil in air box

Post by WingAdmin » Mon Jul 28, 2014 12:27 pm

Hawkeye, your comments are 100% spot on. Either too much oil (usually the cause) or a pressurized crankcase.

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Re: oil in air box

Post by bigbugshurt » Thu Jul 31, 2014 12:07 pm

Yes, the crank case vent on left rear of engine is plumed to left bottom of air box, and the drain tube goes from the right rear of the air box down to a collector mounted to the frame behind the engine down close to where the center stand mounts. It does need to be serviced some times. Check oil level. One may consider a heavier oil in a extremely high mileage bike (20w50?). I would be surprised if there is a broke ring in a goldwing!

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