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Been lurking for a while. Thanks for all the information on the site. I apologize for the bad pictures. I also doubt I'm the first one that thought of this. But here it is anyway.
850 carb fix 003.jpgI recently got a 1980 GS850 (free from a friend). (I plan to start a thread about resurrecting it.) He'd gotten it several years ago but it sat in his basement as it's one of many projects he has going. Anyway when I hooked fuel to the carb bank I got leaks from the vents. Problem was a broken float post in the #3 carb. Someone had attempted to fix it with epoxy but it didn't hold. It had broken where the pin went through the post. So it left a good stub.
My fix was to get a brass bushing 1/4" x 5/16" x 3/4" and press it onto the stub. I had to file the post a bit but kept a light press fit. The bushings are fairly fragile when it comes to stretching so the fit can't be too tight. Then I drilled a hole in the lower end of the bushing and post to pin the bushing on. The valve seat screw and the bowl keep this pin from coming loose. Then I drilled from the good post through the bushing for the float pin.
In order to clear the float bracket I had to file the inner face back to the original dimensions of the post. I had to file the float bracket slightly as well to compensate for the added material thickness of the bushed float post to give me proper float range. The bowl fits with no interference but I did have to use the bowl from another carb. Adding the bushing on the post meant I needed a longer pin. I made one out of some music wire. The bowl will just cover the longer pin in that slot in the bowl made for that purpose. The original bowl wouldn't seat because of this. I could have filed the slot in the original bowl a bit, but it was easier to swap bowls. Hopefully towards the end of the week I'll have the carb bank back together for a wet test, but as of now everything looks like it will work. If I've messed up somewhere let me know but it looks like it should be good to go.
David
850 carb fix 003.jpgI recently got a 1980 GS850 (free from a friend). (I plan to start a thread about resurrecting it.) He'd gotten it several years ago but it sat in his basement as it's one of many projects he has going. Anyway when I hooked fuel to the carb bank I got leaks from the vents. Problem was a broken float post in the #3 carb. Someone had attempted to fix it with epoxy but it didn't hold. It had broken where the pin went through the post. So it left a good stub.
My fix was to get a brass bushing 1/4" x 5/16" x 3/4" and press it onto the stub. I had to file the post a bit but kept a light press fit. The bushings are fairly fragile when it comes to stretching so the fit can't be too tight. Then I drilled a hole in the lower end of the bushing and post to pin the bushing on. The valve seat screw and the bowl keep this pin from coming loose. Then I drilled from the good post through the bushing for the float pin.
In order to clear the float bracket I had to file the inner face back to the original dimensions of the post. I had to file the float bracket slightly as well to compensate for the added material thickness of the bushed float post to give me proper float range. The bowl fits with no interference but I did have to use the bowl from another carb. Adding the bushing on the post meant I needed a longer pin. I made one out of some music wire. The bowl will just cover the longer pin in that slot in the bowl made for that purpose. The original bowl wouldn't seat because of this. I could have filed the slot in the original bowl a bit, but it was easier to swap bowls. Hopefully towards the end of the week I'll have the carb bank back together for a wet test, but as of now everything looks like it will work. If I've messed up somewhere let me know but it looks like it should be good to go.
David
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