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No 2 plug is black

  • Thread starter Thread starter dougv42
  • Start date Start date
D

dougv42

Guest
Hi all
Re: 1987 GS850
Recently sorted out my fuel tank with a new diaphragm so that the tap works properly instead of flowing regardless of whether it was on Prime, Main or Reserve. But having done that the bikes started pinging big time.
Pulled all the plugs in turn and it would seem that no2 carb is running rich as the plug was black (the other three were tan). Now heres the challenge. It was working just fine before the vacuum was sorted on the petcock but since being done it's playing up.

Question: How/why does sorting out the vacuum cause the carb to suddenly run rich?

In light of the fact that the vacuum is taken from the second carb there's clearly a connection but I don't understand and would like both advise as to how to fix it and more importantly what is going on to cause the problem in the first place.

Any advise/wisdom eagerly accepted

Doug
 
You need to replace the petcock. The petcocks are unrepairable in my experience. The kits you buy to repair them with don't work very well.The petcock is allowing excess fuel to run to number 2 cyl. via the vacuum hose. If you take it fora run on prime the symptom of richness on number 2 cyl. will go away I am sure.
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. dougv42,

Do you really have a 1987 GS850? They stopped importing them to the States in 1983 but Europe continued to receive them for a few years after that.

I concur with the bad petcock advice. There is probably fuel running back down the vacuum line and fouling the #2 plug.

Let me dump a TON of information on you and share some GS lovin'. :D

I just stopped by to welcome you to the forum in my own, special way.
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If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....
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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...

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Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

Thanks for joining us. Keep us informed. I will put you on my prayer list.

Thank you for your indulgence,

BassCliff
 
Hi BassCliff

Yep, I really have an '87 850. I've upped a couple of snaps. She's the third one I've had. Got to say I prefered my first back in 1984, it was a '79 GN model.

Thanks for your advice by the way... oh and I live in England hence the '87 plate as you'd suggested. :)
 
It would seem that turning the cock to Prime only worked temporarily as the noise has come back as has the blacked plug.
Any ideas?
 
Hi,

Setting the petcock to the "PRI" (Prime) position allows the fuel to flow without the vacuum from the #2 carb. It was meant as a test. Your petcock is bad and must be replaced. Some have had success with a petcock rebuild kit, but many have not.


Thank you for your indulgence,

BassCliff
 
Check for rust in your tank. If rust particles are blocking the diaphragm from closing, then fuel is flowing at will. Also, check your petcock vac tube to see if it smells like fuel. Black plugs are a sign of it being too rich. If its your #2 plug that's fouling, then I would say that your problem is your petcock, allowing fuel to flow down the vac tube and flood your carb.

Replace your petcock and you should be good. Just remember, if your replacement petcock is NOT vacuum actuated, you NEED to plug your vac port on the carb rail.
 
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