Metal Plug Inside Carb?

[gregzbutt]

Hello Everyone!

I've been a lurker on the forums for some time now, but this is my first official post. I'm in the midst of resurecting my 1980 GS850G that my father purchased brand new. It has been sitting for the past 4 years, and given the age of the bike I figured it was time to tear down the carbs and replace all those decaying o-rings. Believe it or not this is the first time the carbs have been off the bike and opened up.

I've only taken one of the carbs apart so far. While running it through the sonicator this metal plug in the below pic disloged itself from it's home and I found it sitting in the bottom of the tank. I did lots of searching but haven't found anyone referencing this on the forums or in any of the rebuild tutorials that are online.

Can someone fill me in about this guy? Is it enough that I just push it back into place or should I try to seal it with something? I noticed that on the stock float bowl gaskets there's a protrusion on the gasket that extends out to push up against this plug. Is that enough to hold it in place?

Thanks for the input! I can't wait to hear this beast run again.

Greg

 

[tkent02]

I would stake it in place with a punch or something so it does not fall out again. The gasket will seal it from leaking. I had one go through an engine once, it messed it up, no compression in that cylinder afterwards..

 

[7981GS]

There is an O-ring that belongs on top of that plug.

Eric

 

[gregzbutt]

Thanks guys! There is a groove on that plug that looked like it could fit an o-ring. I wonder where that got to...

Greg

 

[Katarat]

Its not a round O-ring, its flat on each side {at least on my GPZ750}if that makes any sense. I dont see why a round one wouldnt work though. I have no idea what it does but Ive lost them before blowing air into the carb while cleaning it

 

[Guest]

Some people use a bit of glue/sealer to seal them in place but like everyone else said, the o-ring and gasket should keep it in there.

 

[tkent02]

Some people use a bit of glue/sealer to seal them in place but like everyone else said, the o-ring and gasket should keep it in there.

Everyone else didn't say that. I said mine went into the engine. Stake it in place.

 

[Nessism]

I used JB Weld on one that came loose on my carbs. And yes to the donut shaped seal.

 

[gregzbutt]

I pulled another carb apart last night and that plug popped out easily. This one also didn't have a seal. Maybe they just disintegrated? Anyone have a pic of one of these donut shaped seals? I'm not seeing it any of the online parts catalogs.

 

[Nessism]

You can see it as part of this carb kit...http://www.ebay.com/itm/1980-1983-s...ries&hash=item5ae6633651&vxp=mtr#ht_926wt_952

http://www.ebay.com/itm/CARBURETOR-...es&hash=item3a70be728f&vxp=mtr#ht_3554wt_1185

 

[gregzbutt]

Ah! Thank you.

Greg

 

[gregzbutt]

Turns out I had that flat type o-ring seal all along! It was stuck to the float bowl gasket when I took it took it off. I thought it was just part of the factory gasket. I was tinkering with it last night and the little guy popped off. Thanks for the help everyone! I'll be posting pics and videos when I get the old girl running. She's a beauty.

Greg

 

[Riding Again]

tkent

how did the plug or o-ring make it from the float bowl into the engine through the jets?

I lost the same one a few years back, I used some jb weld to hold into place and then put the rubber ring back.

 

[Guest]

Everyone else didn't say that. I said mine went into the engine. Stake it in place.

You must be running some big jets to pass that plug

 

[tkent02]

You must be running some big jets to pass that plug

tkent

how did the plug or o-ring make it from the float bowl into the engine through the jets?

I lost the same one a few years back, I used some jb weld to hold into place and then put the rubber ring back.

The plug is in between the venturi and the float bowl, if engine vacuum pulls it up into the venturi, the next stop is the intake valve and cylinder. It can't fall down, the edge of the float bowl is in the way. Duh.

I don't know how the plug went up into the venturi, but it must have. The plug was missing, and the cylinder has near zero compression.
Maybe it was the wrong size plug, maybe someone put it in the wrong way, I dunno.

I may find out more when I pull the engine apart. Maybe even find a munched carb plug stuck into a piston.

 

[Katarat]

Glad you found it. Its kind of hard describing a flat o-ring. I really dont think it even needs to be flat. Lots of lessons to be learned the first time you get into the carbs, like blowing the springs under the air adjusters across the garage into never never land

 

[850GT_Rider]

It's happened to several of us. Here's another thread about the same issue.

http://www.thegsresources.com/_forum/showthread.php?t=184652&highlight=weld