black Spark plug


Information and questions on GL1000 Goldwings (1975-1979)
  • Sponsored Links
User avatar
jarvait
Posts: 14
Joined: Sat Apr 24, 2010 3:07 pm
Location: Roberval, Québec, Canada
Motorcycle: 1978 GL1000

black Spark plug

Postby jarvait » Mon Jun 20, 2011 6:38 pm



I have problems with one of my my spark plug. I clean my carburator, but one of my spark plug is black. How to fix this ?



Bbwelder
Posts: 48
Joined: Sun May 22, 2011 9:10 pm
Location: Huntsville tx
Motorcycle: 1985 gl1200

Re: black Spark plug

Postby Bbwelder » Mon Jun 20, 2011 6:42 pm

Sounds like no spark in that hole or way too rich.

User avatar
jarvait
Posts: 14
Joined: Sat Apr 24, 2010 3:07 pm
Location: Roberval, Québec, Canada
Motorcycle: 1978 GL1000

Re: black Spark plug

Postby jarvait » Mon Jun 20, 2011 6:52 pm

I have spark in the hole because i have the power of 4 pistons. I have a strange sound to the output of the right exit muffler. This is not a back fire. It's like my muffler swallowed air after a high-revolution.

Thank.

User avatar
dingdong
Posts: 2863
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: black Spark plug

Postby dingdong » Tue Jun 21, 2011 8:33 am

You probably have a float in the carb feeding that cylinder that is out of adjustment or sticking. When you cleaned the carbs did you adjust the floats? What all did you do to clean them. Was this a rebuild or just a cleaning?
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.

User avatar
thrasherg
Posts: 1837
Joined: Tue Oct 20, 2009 11:21 am
Location: Plano, TX
Motorcycle: 2004 GL1800, 2005 Honda Shadow 750, 2008 Yamaha R6 with RG500 engine, CRF450X, CRF230, CRF250X, XR200, CR500

Re: black Spark plug

Postby thrasherg » Tue Jun 21, 2011 10:14 am

If you have CV (Constant Velocity) carbs, it could also be the slide that has stuck causing the mixture to become very rich. You have 2 butterflies on the carb, one connected to the throttle cable, the other connected to the choke mechanism, in between the two butterflies there is a piston/slide that moves up and down to create a constant air velocity (Hence the name), this slide also controls the mixture, sometimes the slides get sticky and don't move freely, when they do you start getting mixture issues. Sounds like you need to remove the carb on the cylinder that is running rich and give it a good clean..

Gary

User avatar
Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: black Spark plug

Postby Fred Camper » Wed Jun 22, 2011 6:54 pm

Sounds like a stuck slider to me. They need to be silky smooth in the boar to work properly.




Return to “GL1000 Information & Questions”




Who is online

Users browsing this forum: No registered users and 2 guests