Needle valve seat screen

[Guest]

Still working on the carbs for my 1980 GS850G. I was taking no.1 carb apart and when I pulled what I think is called the needle valve seat out, it's that thingy that you wiggle out after removing the floats, I found it had a screen of some kind on one end.

The tutorial didn't show a screen and I'm just wondering how common this is.

Funny thing is that I was just beginning to think I was wasting my time, 'cause my carb was looking pretty good inside and all the washers and o-rings seem to be in good shape, but then I found all this gunk on this little screen. It was pretty much covered with black stuff. I cleaned it up and am now thinking I guess it was a good thing to do this carb cleaning after all!

[mike_of_bbg]

The BS30's I just disassembled all had them. Yeah, the fuel galleys were (internally) where most of the crud was.

Your bike should feel much better after this cleaning. But you don't want the crud to come back. So, what shape is your tank in? Time for a clean/seal?

[oldgsfan]

Yeah, I just read the tank cleaning tutorial on Bass Cliff's site. I probably should do that, but dang, I'm still hoping I get the carbs all together and the bike running again soon before our three days of summer in the Pacific Northwest are all used up!

[Steve]

Those little screens are your secondary fuel filters. They catch what the petcock filter misses.

If you have that much crud on the fuel valve filters, you might want to check the integrity of the petcock filter.

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