Carbon spatter?


Information and questions on GL1500 Goldwings (1988-2000)
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Farmboy57
Posts: 14
Joined: Mon May 07, 2012 7:15 pm
Location: Moncton, NB,Canada
Motorcycle: 1990 GL 1500SE

2009 GL 1800 Airbag
2000 GL 1500 SE
2000 Valkyrie 1500
1984 GL 1200
1981 GL 1100

Carbon spatter?

Post by Farmboy57 »



Another new one for me. My recently purchased '90 gl1500 leaves a black grainy spatter (like improperly reduced paint from an airbrush) on my garage floor when cold started in the morning. I'm assuming its carbon in the actual muffler. I've been using Seafoam since I brought the bike home about 2 months ago, adding a few ounces at a time when fueling up, but I've only put about 800kms on her since then. I'm assuming it's carbon from the baffles and assorted other exhaust restricting pieces inside the muffler that have collected the stuff from too high a gear at too low a speed over the years (30 thousand kms on teh clock). I call it the 'kindness' syndrome. If I'm right that it is just carbon being purged, how long can I realistically expect this to continue. Just had a thought, could it be choking it in the morning? Not my first rodeo but first time I've seen this if that's the case.




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Swagonmaster
Posts: 347
Joined: Sun Apr 16, 2017 3:30 pm
Location: Stokesdale, NC
Motorcycle: 1990 gl1500 SE

Re: Carbon spatter?

Post by Swagonmaster »

You are likely correct about the source of the carbon and it likely has built up during a lot of around town driving without getting the exhaust really hot as during a longer highway drive. Having said that, my bike also leaves a small amount of deposits on cold startup.
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!
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bigsteveswing
Posts: 159
Joined: Mon Jun 11, 2018 4:40 pm
Location: Erie, PA
Motorcycle: 1992 GL1500I
Motorvation Formula II sidecar

Re: Carbon spatter?

Post by bigsteveswing »

Mine does the same, 75k on the odo, every other wing owner I've talked to says it's normal...hopefully
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dingdong
Posts: 4164
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500A
2004 NRX1800 Rune SOLD

Re: Carbon spatter?

Post by dingdong »

My 93 spits out moisture on first start but no carbon. You may be running a little rich. Might want to check your plugs.
Farmboy57
Posts: 14
Joined: Mon May 07, 2012 7:15 pm
Location: Moncton, NB,Canada
Motorcycle: 1990 GL 1500SE

2009 GL 1800 Airbag
2000 GL 1500 SE
2000 Valkyrie 1500
1984 GL 1200
1981 GL 1100

Re: Carbon spatter?

Post by Farmboy57 »

Thanks for the input everybody, much appreciated. I only asked the question as both my 2000SE and 2000 Valkyrie Interstate never exhibited this residue that I recall. Maybe the exhaust tips on this beauty pointing down just make it more noticeable? Checked and cleaned the plugs a few weeks ago when I changed the timing belts, all is well. I'll get under it this weekend and see if there are any weep holes that may be plugged (if it has any to begin with) and then it is what it is, as she starts every day and runs great. Can't ask for better.
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Sassy
Posts: 261
Joined: Thu Nov 05, 2020 12:15 am
Location: Wynndel bc canada
Motorcycle: 1989 gl1500

Re: Carbon spatter?

Post by Sassy »

My 89 does the same thing cold but with the choke off, warm nothing but thd sweet sound of a Porsche,, ah I mean Wing! :lol:
Fred
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Swagonmaster
Posts: 347
Joined: Sun Apr 16, 2017 3:30 pm
Location: Stokesdale, NC
Motorcycle: 1990 gl1500 SE

Re: Carbon spatter?

Post by Swagonmaster »

It should clear up after some highway driving, faster of course if the trip is long and the system really has time to get hot. If it doesn't it is running rather rich and may need to be looked at by someone that knows Wings well.
Btw, the air filter is in good condition isn't it?
Try to learn from the mistakes of others..... you won't live long enough to make them all yourself!
Farmboy57
Posts: 14
Joined: Mon May 07, 2012 7:15 pm
Location: Moncton, NB,Canada
Motorcycle: 1990 GL 1500SE

2009 GL 1800 Airbag
2000 GL 1500 SE
2000 Valkyrie 1500
1984 GL 1200
1981 GL 1100

Re: Carbon spatter?

Post by Farmboy57 »

Filter is new at same time as oil and brake fluid change and coolant flush. All good tips everybody. Thank you. What a great site!
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WingAdmin
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Posts: 22401
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (sold)
1998 XV250 Virago (sold)
2012 Suzuki Burgman 400 (wife's!)
2007 Aspen Sentry Trailer
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Re: Carbon spatter?

Post by WingAdmin »

Are you letting the bike sit with the choke on for a long amount of time? Unlike most chokes that restrict airflow, the choke in the 1500 operates by enriching the mixture. If the mixture gets too rich, it can result in unburned hydrocarbons, which get emitted as black soot like you see here.

Typically, I will choke the bike fully when I first start it cold, and start reducing the choke quickly, turning the choke off completely as soon as the bike will idle steadily without it.
Farmboy57
Posts: 14
Joined: Mon May 07, 2012 7:15 pm
Location: Moncton, NB,Canada
Motorcycle: 1990 GL 1500SE

2009 GL 1800 Airbag
2000 GL 1500 SE
2000 Valkyrie 1500
1984 GL 1200
1981 GL 1100

Re: Carbon spatter?

Post by Farmboy57 »

Startup is fairly routine....I give it about 3/4 choke, light it up and keep the idle at about 1500, closing the choke as idle permits keeping it choked above the up/down surging range. By the time I have my jacket and lid on, the choke is close to closed. I'm down the driveway and just starting up the street before shutting it off under easy acceleration in 2nd. I'm at peace with it being crap from the mufflers. Judging from the bike's condition it's been babied for all 30k kms and 31 years. It's not a big deal, simply curious I hadn't noticed this from my other two 1500's from years ago. Thanks for all the help and feedback, all of it appreciated.


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