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Can I retro-fit a gravity type fuel petcock from older bike

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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Hi folks!
Got a 78 gs400 that had stood outside for years. Goes like a scalded cat! However, this was only when I fitted the tank off of a Honda CB400 with an old type gravity feed fuel petcock (I stuck a screw in the vacuum line from intake manifold, lashed tank to frame with my belt). The original GS 400 fuel pet cock is a bit-- to fit the two lines (vacuum and feed) to, as both are hidden, and there is no petcock drain bowl.
Question- before I make a plate to cover holes, and then tap a large hole to screw in a CB 400 fuel petcock, is there an earlier type, gravity feed petcock that will fit directly to the underside of the 78 GS tank (same hole pattern)?
This is the only thing stopping me from having a blast.
 
thats odd, because my 78 GS400 has a gravity feed petcock....
 
gravity feed petcock

gravity feed petcock

Any ideaa what it's from? My shop manual shows a vacuum opning petcock- vacuum from the inlet manifold pulls open a diaphram in the petcock, allowing a piston to be retracted, and fuel to flow- complex, expensive and prone to not work- and tis is what i have on the bike.
Any ideas what to fit?
Regards,
Justin
 
no idea, its the way I bought it. Its kinda odd, but in the Clymers manual I've got, it has a diagram of the petcock I have, but describes the petcock you've got. At any rate, I bought a petcock repair kit for it, and all the parts fit, but I had one thing that I didn't recognize left over... i dunno, keep checking ebay?
 
I once replaced a vacuum petcock on a Kawasaki with a gravity feed one from an old Suzuki. I think most of them are the same bolt pattern. I would recommend trying a junk yard and match one up.
 
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