Help finding a needle jet or should I use this one?

[Guest]

Hello All, I cannot find a replacement needle jet for a 1985 GS700E. The part number is 09494-00481. (Y-5) I tried all the locations mentioned in other posts about jets. (JetRus, Partzilla, Babbits, Diablo, Wahl, ect.) Tried ebay and amazon. Does anyone have any suggestions? How bad would it be if I put this one back in? I took it out with a dowel, but it's chewed up and looks broken at the top of the channel for the indexing pin. Any help is much appreciated.

 

[KiwiAlfa156]

Unfortunately, the main jet will never seal on the bottom of that needle jet and so the metering will never be right. So I would consider reusing it.

 

[KiwiAlfa156]

Y-5 is the Mikuni metering code and is used across a range of different series of Mikuni emulsion tubes (what Mikuni calls this piece - some carbs have separate emulsion tubes and needle jets, some are one piece) Have you worked out what Mikuni series (jet dimensions) the emulsion tube is? A lot of Mikunki parts websites show dimension diagrams.

 

[Nessism]

I'd reuse that jet. The main jet threads inside, which is what provides the seal between the parts. There is a large fat washer that also helps the seal. Run a bottoming tap inside the needle jet to clean up the threads as needed.

 

[bitzz]

Have you tried Sudco?

 

[Guest]

Just looked thru it. I don't see it. Great resource though. Thanks

 

[Suzukian]

Nessism​ is right. Just smooth the rough edges, the metering happens inside. You'll have no problem. If you don't have a bottoming tap, you can grind the regular tap till it's flat. Use a triangle long file to remove any burrs, and try it first on a nut. We did this many times at Sikorsky Aircraft.

 

[Guest]

Thanks Suzukian. I'll give it a go.