RS34 and BS34 Choke Plunger Size Comparison

Nessism wrote:

What about the diameter of the plunger?  Are these "raised lip" plungers the same diameter as the regular BS34 plungers?  


 

Wookie58 wrote:

Nessism post=913089 userid=14026What about the diameter of the plunger?  Are these "raised lip" plungers the same diameter as the regular BS34 plungers?  

I went through my hoard of old plungers and replaced the rubber in all of them.  Sort of proof of concept that I could do it effectively.  I took a damaged VM and another BS plunger, cut the crimped edge off, then measured the cavity diameter.  That helped greatly, in sizing the rubber donut.  Wish I could find Viton grade B sheet here in USA, but it's elusive.  I'm using grade A, which seems to work fine, but it's not as resistant to oxygenated fuels as the grade B stuff.  Better than what was used 50 years ago, though.  

Don't know how bad you want this stuff Ed, below is details of a UK supplier that lists it