'82 GS 750 gasoline expelled out the exhaust

[Nanyk]

https://clipchamp.com/watch/VXn8u2UvNKw

Hello!

First time posting on the forums, though I've spent a little time lurking!

I have a 1982 GS 750T that's giving me some trouble. I noticed that it was leaking a mixture of oily gas from the exhaust on the bottom of the bike, and then descended into insanity to try to figure out how to get it to stop.

So the crux of the problem is that for some reason I am getting an excess of oil and gas coming out of cylinder 2. All other cylinders run correctly, and I cannot figure out the malfunction. Check video below for a visual aid. Pretty much straight gas getting ejected into the exhaust. I took the pipes off to better see what was happening, and in the video you can see it shoot straight out of the engine.

Before I begin, I know that gas getting into the oil is terrible for the bike. When I first pulled the carb off and cleaned all the jets and floats I gave her a oil and filter change, thinking I'd fixed the issue for good, knowing gas striping off the oil is probably the worst thing for an engine. I am poised to change the oil again once I have a solution.

I also know running no pipes is terrible. Gunk into engine is bad as is the danger of fireballs. Promise I'll watch my eyebrows and have tape over the exhaust ports while not in use. Will tighten her back up as soon as I have it solved!

I have changed the spark plug, cleaned the carb jets and checked that the needle jet is functioning to a similar degree as its companions in chamber 1 and 3 (seems to have a good enough bounce!), reset the float and ensured it can swing freely. I want to believe that the carb is flooding and sending too much gas into the engine, but need someone with more experience to tell me I am correct and garbage at carb restoration and should go back and do it again! Video is the second time I've got the engine to start after cleaning/emptying/priming carbs with gas again and checking the spark plug.

Is there anything else I can do to slow down the flow of fuel to #2? Running stock Mikuni Carbs with no add-ons. Pretty much stock everything, airbox, pipes, tank and even petcock are original.

Thanks for reading my short novel, big fan of the forum and can't to pester everyone with more questions when my 'Project ('82 1100e) bike" gets into the weeds!

[Nessism]

Please review the Newbie Mistakes thread linked in my signature. First step, rebuild the carbs properly, and check the petcock. It may have failed, dumping fuel into the carbs via the vacuum line.

[rphillips]

Yes, what he said, the newbie mistakes will often answer many questions you never thought about... That being said, That's a "lot" of gas... Are you sure you put the pilot jet in # 2, I didn't realize that much would go through that tiny hole.

[Nanyk]

Nessim you were exactly correct. Checked the vacuum line and it was full of gas. Swapped the petcock with the 1100 and it ran flawlessly without anything 'unnatural' coming out the exhaust. Will order a new one for the 1100 in the meantime.

Totally right rphil, kinda a scary amount to be popping out. Very sure the pilot jet went back in! But makes sense that the gas wasn't coming out of the carb and getting dumped in by the vacuum hose.

Off to change oil and possibly ride this afternoon. Thanks again all!

[rphillips]

Don't we just love simple solutions. Congrats... Oh yeah, Welcome

[Nanyk]

Ty ty glad to be here!

[Rich82GS750TZ]

Welcome. We need to see more pictures of that “T”. Or at least I do.

I’d especially like details about your engine case guards.

[Suzukian]

Make sure your crankcase oil has no gas in it. I would seriously consider changing the crankcase oil.