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Discussion Starter #1
I️ recently cracked my petcock near where the fuel goes into the tubes. I️ don't really see a way to fix that. Does anyone know where to buy a new petcock? It's an older one and has a cross tank tube that feeds into it, which is the main problem with all the newer knock offs. Maybe I️ can buy a newer one and seal off the cross tank tube??? Any help would be greatly appreciated.
 

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Did you crack the body of the petcock itself, or is the brass tube cracked? If it is the tube, then it can be soldered. New petcocks are pretty pricey and hard to come across. Used ones come up on ebay often, but plan on buying a rebuild kit. If you are looking at one of the generic petcocks without a crossover tube, then you can block off the crossover tube on the tank. Honda actually eliminated the crossover on the latest CB77 tanks. You won't be able to get all of the gas out of the far side, though. If you do a temporary block of the crossover, then you can open it up again if you find a better CB77 petcock. One problem with the generic CB350/CB450 type petcocks is that the fuel outlets are on the wrong side for the CB77, requiring some inventive fuel line routing.
 

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Discussion Starter #4
Thanks. The brass tubing snapped off but it looks like there's a hair line fracture in the petcock itself where the tubing snapped off. I️ might try and sodder the whole thing. i've looked everywhere for a new one but can't find anything on eBay or craigslist. I️ guess i'll try either soddering it or buying a were knock off and sealing off the cross tube. Thanks again.
 

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My brass tube is split and twisted severely…. can I just go over top of it with an oversize brass tube? There isn't much left to solder...
 

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That sounds like it should work, as long as it is sealed at the bottom where it meets the petcock. If not, it will not be much use as a reserve. Just make sure that you don't block the opening at the bottom where the primary inlet is. Some people have pulled out the old brass tube and replaced it with new brass tubing from a hobby store. I'm not sure what the diameter is, though. I haven't tried this, but have a petcock or two that I am planning on trying it on.
 
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