The Mikuni genuine viton tip needle valve assemblies are the best replacement parts for your leaking carburetor. The VM28/511 viton tip needle valve assemblies fit the VM30-VM40 snowmobile carburetors. If your application is for the street VM carburetors then you will need Mikuni VM26/26 needles and seats. The set includes a viton tip needle, screw in type needle valve seat, and sealing washer. Available in various sizes from #1.5 to #2.5 in order to match up to the fuel flow characteristics of your engine.
These needle valve assemblies include the sealing washer, no one else includes the sealing washers!
Please feel free to contact us with any additional questions or requests, we are available by direct line, IM, or email. We are available for tuning and setup questions as well as continuing product support after the sale.