Afterwards, I put the petcock in some hot soapy water and cleaned up the worst of the dirt:


Forgot the pictures, but I took off the plate which holds the lever in place, took out the small four-hole gasket and the V-Ring on the lever. Lubed up the gaskets with some vaseline, including the membrane on the back (which I left in place for fear of destroying it), and after closing up the back side, put it into the ultrasonic for approx. 2 hours (sans gaskets of course). Turned out nicely:



As with the other petcock, I wrapped some teflon around the nozzle's base for a tighter fit:



Again, no after pictures, but suffice to say, the petcock doesn't leak at all, flows nicely as far as I can tell, and the vacuum membrane works as intended. No more leaky carbs! (Still a hanging idle, but that's another topic.)

Edit: Teflon tape is DIN 30660 / EN751-3 FRp, that's the one which is resistant to oil/gasoline, for fine-pitch threads.

Remember the new dowty washers on the mounting bolts. They stop fuel leaks due to the fuel migrating down then threads of the bolts. I got to the local hardware and get bonded sealing washers like used on tin roofs and such. They re slightly dish shaped, are metal on one side and rubber on the other with a hole in them for the nail to pass through. Work perfectly and they dont need to be ordered for 3 bucks each....LOL

example......

I made some myself from gasket paper, holds up well so far - I initially feared they get ripped apart by turning action of the bolts, but it worked fine. The bonded sealed one sure look nice & make a lot of sense, I'll grab a few when I come across a good deal.

My local hardware has them..like 5 or 10 cents each.