Second pot running rich

[kurifu]

I pulled my plugs today, I get a bit of a soft popping every once in a while on my bike, typically if the choke is pulled out and I hit the throttle and noticed that everything looked good except the plug on pot #2, it was almost carbon fouled.

I suspect I need to adjust my carbs at some point, I am waiting for my colortune and carbtune kits to arrive before I touch them, however is it possible that this is being cause my a leaky vacuum on my petcock?

I disconnected the hose, smelled like gas, but difficult to say if that was because some gas came out when I also disconnected the fuel line. I blew down the tube and only a tiny tiny bit of moisture came out, could have been from my own breath.

[mark]

Year and model of your bike will help.

[chef1366]

If it's 1980 and up four cylinder bike the petcock vacuum line runs to the #2 cylinder. Check the line for gas and replace petcock if there is.

[chuckycheese]

Right!

Our chef may have it right. If you've got an after-market petcock, the vacuum port may be leaking. (I experienced that problem, over the weekend, for about the third time). These carbs are somewhat forgiving but extra air causes big problems!! (I bought a couple of extra vacuum caps since they seem to deteriorate quickly.)

[bwringer]

Fouling on #2 is the textbook sign of a leaking petcock. What happens is that the vacuum diaphragm develops tiny pinholes over the decades and extra gas gets pulled through and into the #2 intake.

Order a new petcock from your favorite Suzuki parts source and forget about the problem for another 20 years.

http://flatoutmotorcycles.com/fiche_select.asp <== cheapest parts, slow, possibly expensive shipping

http://bikebandit.com/ <== fast, cheap shipping, parts cost about 20% more

http://www.crc2onlinecatalog.com/ <== fastest of all if they happen to stock the correct petcock for your bike.

Don't fart around with homemade fixes or rebuild kits. They usually don't work, and they aren't safe to use on a safety critical fuel valve located eight inches from your genitalia.

[kurifu]

Chef;

You are right, it is a 1980 GS1000 GT. Well, I am going to go with there being a leak and get myself a new petcock. Since I want to colortune soon I guess I will have to fix this to properly tune the bike.

Thanks.