#2 Cylinder Dead

[JW-GS750E]

My #2 cylinder goes cold once the bike comes on speed. I have completely swapped out both #2 & 3 wires and plugs, but #2 continues to run cold. I did notice that after installing my rebuilt carbs the #2 cylinder was firing for a short period using some starting fluid to get the rebuilt carbs primed, but once on speed (self-sustain idle) the #2 went cold. Could this be a carb issue flooding the cylinder out? Any help would be appreciated. Thanks,

JW-GS750E

[koolaid_kid]

It is most certainly a carb issue. If the plug is black and or wet, it is flooding. If it is dry and whitish, it is lean. Either way, you need to pull that carb and check it out.

[Big T]

I'm just guessing (because you didn't tell us) that your 750 is an 80 or newer

If I'm correct and you don't find anything horribly wrong in the carb, you need a new petcock

[tom203]

Try blocking off petcock vac line on carb and see what happens- you'll need to put petcock in prime spot to run.

[BassCliff]

Greetings and Salutations!!

Hi Mr. JW-GS750E,

Yes, a fouled #2 plug usually indicates a faulty petcock. Replace it. You'll find more tips, tricks, "how to" guides, and just about everything you need to know about the care and feeding of an old GS motorcycle in the links below. It's your S.W.A.G.

Pay particular attention to the maintenance lists in the "mega-welcome" and the "Top 10 Newbie Mistakes". They will save you hours of frustration.

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If you are here you probably have a 30 year old motorcycle that needs about 20 years worth of maintenance. You'll find all kinds of helpful tips, procedures, manuals, etc, in the links below. Let's get started.

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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...



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!

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff

[koolaid_kid]

Do we know yet that it is fouled? Just asking, as I have not seen that information posted yet.

[JW-GS750E]

Thanks for everyone's input. I just got home from work a short while ago and tried the petcock troubleshooting first. The machine lives on all four cylinders again! I will have to store this data in the memory banks for sure.

Regards,
JW-GS750E