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Options to repair broken brass tube on bottom of carb versus replacement?
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Guest
Guest
It feeds the choke circuit. VM carbs? What bike? It may be possible to solder it back on, but best solution is probably to replace the whole carb body.
S
stemi
Guest
Its a 1977 GS550.
I replaced similar tubes in the float bowls of some Keihin carbs. Used this tutorial... http://cx500forum.com/forum/general-discussion/7662-float-bowl-overflow-tube-raplacement.html
Hardest part was rolling over the end of the tube. I used the dimple in the side of a threading die to roll over the ends but the rolled lip was fragile and some of it broke off when the tube was pressed into the carb body. You may want to experiment with the best way to roll over the end and consider soldering the end of the tube and then drilling a small hole through the solder. You have to drill holes in the side of the tube anyway so what's one more hole? At any rate, I think it's a very doable project.
Hardest part was rolling over the end of the tube. I used the dimple in the side of a threading die to roll over the ends but the rolled lip was fragile and some of it broke off when the tube was pressed into the carb body. You may want to experiment with the best way to roll over the end and consider soldering the end of the tube and then drilling a small hole through the solder. You have to drill holes in the side of the tube anyway so what's one more hole? At any rate, I think it's a very doable project.
Yes at the holes at the very top is usually where they break off. I was told they are bleeder holes that stop too much fuel to be sucked up when choke is applied. Basically the tube is said to fill uo and its more or less like you sipping coffee from the very rim of your cup. Enough for a taste but not to instantly fill your mouth.
S
stemi
Guest
That was my next question... Does it matter if one of the four tubes is broken? As long as it doesn't affect the idle or smoothness of running down the highway I might try it without repairing.