Carburetor O-ring Kits

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Carburetor O-ring Kits

03 Dec 2025 09:00 - 03 Dec 2025 13:04
#919527
Carburetor O-ring Kits

Each set covers a set of 4 carbs.  Cost is $21 shipped in the US, and $2 extra outside the country.  Message for payment info (paypal, or cash).  

All O-rings are Nitrile/Buna-N. These O-rings will swell slightly with gasoline contact, which helps improve the seal.

Mikuni VM Kit (VM26, VM28 (later version, not the Z1 version carbs), VM22, VM24

- 4 Pilot Fuel Screw O-rings
- 4 Pilot Air Screw O-rings
- 4 Drain Screw O-rings
- 4 Choke Plunger Cap O-rings
- 4 Bleed Pipe O-rings
- 4 Accelerator Pump nozzle O-rings (optional)

Most sets won't need all these parts, but I include them to keep it simple.  If you want Optional O-rings for an accelerator pump, let me know in advance.

I also have O-rings for the most common size Fuel Tee & Transfer Tubes.  If you want some of those, again, let me know in advance.


Mikuni BS/CV Kit (BS34, BS32)

- 4 Pilot Fuel Screw O-rings
- 4 Drain Screw O-rings
- 4 Choke Plunger Cap O-rings
- 4 Float Valve Seat O-rings
- 4 Pilot Plug O-rings
- 12 Fuel Tube & Vent Tee O-rings

Again, most sets won't need all these O-rings, but they are included regardless.  


Keihin CV34 Kit (KZ750).  These also fit the later year 440 ($15, for a half kit)

- 4 Float Bowl O-rings
- 4 Drain Screw O-rings
- 4 Pilot Screw O-rings
- 4 Pilot Plug O-rings
- 10 Fuel Tee, Transfer Tube, Vent Tee O-rings


Lastly, for those folks with the highest desire for DIY, I offer Mikuni Choke Plunger Viton rubber donuts for $20/set.

5 donuts per kit of carbs (one extra, because they are tricky to install).  To remove the old seals, dunk the plungers in carb dip for a couple of days to soften the rubber.  Heat can also be used, but that requires more care.  To install, use silicone grease, a small screwdriver, your fingernails, and in my case, an old pick tool recontoured into a spoon shape.  It's not easy to install these seals, but it's very doable (I've done more than a dozen sets of plungers).  These donuts are flat, so if you have the later year BS34 carbs, with a raised lip on the rubber seal, these won't replicate that feature.

Contact via Private Message or email to nessism AT sbc global DOT net

Thanks

Ed


 
Last edit: 03 Dec 2025 13:04 by Nessism.
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Re: Carburetor O-ring Kits

05 Dec 2025 10:54
#919571
At this time of posting, I have several sets of accelerator pump diagrams, and a bunch of fuel tee's for center feed VM carbs.  If you need fuel Tee's for the "dual feed" VM26's, I can accommodate those as well, by modifying the center feed Tee's on my lathe.  Message or email to discuss as needed.
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