Sooty spark plug


Information and questions on GL1100 Goldwings (1980-1983)
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Ranisal
Posts: 6
Joined: Fri Oct 02, 2015 12:21 am
Location: Israel
Motorcycle: 1982 Gold wing
1979 Yamaha xt 500

Sooty spark plug

Postby Ranisal » Fri Oct 02, 2015 12:40 am



Hi
I have a 1982 Goldwing, the bike is doing 120m fer tank.
And I have to replace plug number 4 about every 200m, the plug is sooty.
I rebuild the carb with randakk kit, checked the valves and the timing, I swapped the ignition cables, and the same problem is coming on and on, spark plug number 4 is burned to death.
Any advice is appreciated
Rani



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dingdong
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Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: Sooty spark plug

Postby dingdong » Fri Oct 02, 2015 8:31 am

Can you post a picture of the #4 plug. Your description is kind of confusing. Sooty / burned to death seems a contradiction. Sooty would point to a rich condition. Burned to death points to a lean condition.
Did you replace the float valves? If so did you replace with OEM or aftermarket?
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

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WingAdmin
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Re: Sooty spark plug

Postby WingAdmin » Fri Oct 02, 2015 11:14 am

Can you compare the plug appearance to any of these?

viewtopic.php?f=15&t=13929

Ranisal
Posts: 6
Joined: Fri Oct 02, 2015 12:21 am
Location: Israel
Motorcycle: 1982 Gold wing
1979 Yamaha xt 500

Re: Sooty spark plug

Postby Ranisal » Sat Oct 03, 2015 5:11 am

It's dry carbon, I guess the bike is running rich, because it's doing a 120 m fer tank, beyond that, and the dry spark plug, the bike ( with new spark plug) is running like a champ.
I did replace the float valves with OEM ( from eBay), and I set the flots to 15.5mm.
Tnx
Rani
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dingdong
Posts: 2863
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Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: Sooty spark plug

Postby dingdong » Sat Oct 03, 2015 6:53 am

Definitely a rich condition. I would suspect that the float level is out of adjustment. Did you adjust the floats correctly? They have to be "perfect". Close doesn't count. Question. Is that plug condition after running on the highway or after a lot of idling?
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

Ranisal
Posts: 6
Joined: Fri Oct 02, 2015 12:21 am
Location: Israel
Motorcycle: 1982 Gold wing
1979 Yamaha xt 500

Re: Sooty spark plug

Postby Ranisal » Sat Oct 03, 2015 7:10 am

It's both, highway, and city run.
I did every thing by the book, should I try to play with the air mixture?

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dingdong
Posts: 2863
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Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: Sooty spark plug

Postby dingdong » Sun Oct 04, 2015 8:03 am

Yes the idle mixture might cause that problem. This same plug condition can also be caused by weak spark to that cylinder. Bad plug cap or plug wire. etc. Read the information at this link. http://www.randakksblog.com/lean-vs-rich/


Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.


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