Strange Exhaust 'Discharge'


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CWJ73
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Strange Exhaust 'Discharge'

Postby CWJ73 » Mon Nov 03, 2014 8:52 pm



I noticed this 'spot' on my driveway after returning from a ride a couple weeks ago. It was sitting in the same location as where I warmed the bike up.

Spot on Driveway
Spot on Driveway


I have seen similar spots a couple other times where i warm the bike up, but generally they were gone before I got back home. Now I have only had the bike a few weeks so I don't know if this had happened before I owned it.

So on Halloween morning while doing some maintenance I thought I would fire it up the bike and see if it would do it again and sure enough it did...

Here it is again while warming up the bike.
Here it is again while warming up the bike.


Here is a video showing the bike in action. Don't mind the 'smoke' it was quite chilly out and that is just condensation.





When I first noticed this there were spots/marks on the ground on both sides, not just the one side, but each time I took the bike out the right side diminished. As you can see it is clearly coming from the exhaust. It looks like it could have been oil, but a quick blast of water from the hose cleaned it right up. After I let it dry the mark looked and felt like carbon residue.

Anyone have any idea what would cause this and how I can fix it?

Craig


Craig

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Re: Strange Exhaust 'Discharge'

Postby WingAdmin » Mon Nov 03, 2014 9:24 pm

It's carbon residue from burned oil. I expect you normally leave your bike sitting on the sidestand?

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CWJ73
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Re: Strange Exhaust 'Discharge'

Postby CWJ73 » Mon Nov 03, 2014 9:28 pm

When at home I have it on the center stand. At work or if I am leaving it for a short period of time I will leave it on the side stand.

I had that thought myself, since I would get the 'blue smoke' pouring out of the left side when starting my GL1100 if I left it on the side stand over night.

The amount of carbon residue have not diminished on the left side like it has with the right side. The first day the right side looked the same as the left side does now.
Craig

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CWJ73
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Re: Strange Exhaust 'Discharge'

Postby CWJ73 » Mon Nov 03, 2014 9:29 pm

I have no idea how the PO left it sitting. He owned it from 1992 till I got my hands on it this October.
Craig

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Mh434
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Re: Strange Exhaust 'Discharge'

Postby Mh434 » Tue Nov 04, 2014 4:43 am

Anytime you do short runs with the bike, carbon builds up in the mufflers. Next time you start the bike from cold, moisture in the exhaust will pick up some of the carbon and, as the exhaust cools on exiting the mufflers, the moisture (and carbon) precipitates out.

Long runs tend to fairly thoroughly clear this out, but even one short run can produce a whole new load.

Whenever I start my bike in the garage, it forms two puddles under the tailpipes. The humidity hereabouts tends to be really high! It takes a good 1/2 hour of running to dry out all the moisture in the pipes.

***It's worth remembering that this moisture & deposits in the mufflers is very, very acidic! That's why 'Wings that only ever get short runs tend to rot out their exhaust systems. It's probably a good idea to get the exhaust nice & hot (and dry) from time to time.***

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Re: Strange Exhaust 'Discharge'

Postby ct1500 » Tue Nov 04, 2014 5:24 am

You are leaving the "choke" on too long while warming up causing a very rich condition. Get into the habit of turning choke down and then off as soon as engine will idle on its' own.

This is best for your spark plugs, fuel mileage and lessens noxious exhaust fumes.
This is what I do
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Re: Strange Exhaust 'Discharge'

Postby dingdong » Tue Nov 04, 2014 7:55 am

Do you smell gas at start up? Looks to me, as ct1500 said, like excessive fuel. I'll wager the plugs are carboned up also.
Tom

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CWJ73
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Re: Strange Exhaust 'Discharge'

Postby CWJ73 » Tue Nov 11, 2014 2:36 pm

dingdong wrote:Do you smell gas at start up? Looks to me, as ct1500 said, like excessive fuel. I'll wager the plugs are carboned up also.

Yes I did notice a very strong smell at start up. I'm not sure I would call it 'gas' but it was very strong.

The plugs in the bike are all new. I talked with my Dad (who rebuilt the bike after it was bought by my wife) and he said the right side plugs were all very black

Prior to the big dump of snow we get here this week I tried out all of your suggestions and the last couple start-ups I noticed MUCH less carbon and moisture coming from the exhaust. The shorter choke time really helped. I will definitely keep this in mind for next year.

Thanks for everyone advice...


Craig


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