The Mikuni genuine viton tip needle valve assemblies are the best replacement parts for your leaking carburetor.  The 990-786-044 viton tip needle valve assemblies fit the HS40, TM40 pumper carburetors and the 786-36011 needle valve assemblies fit the TM36 flatslide pumper carburetors.  The set includes a viton tip needle, press in type needle valve seat, and sealing o-ring.  Available in various sizes from #3.3 to #3.8 in order to match up to the fuel flow characteristics of your engine. 

• Mikuni TM40 and HS40 pumper carburetors, standard size is #3.8
• Mikuni TM36 pumper carburetors, standard size is #3.3
  

These needle valve assemblies include the sealing o-ring, no one else includes the sealing o-rings!


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.