Related to the PW26 carb discussions posted here over past several weeks;
The original PW26 fuel bowl (square bowl) drain screw gasket is a very thin fiber washer with a small surface area to seal the screw to the bowl drain port radius. My CL77 has the stock steel drain screws (not the kit replacement brass with wide head & surface area), and O-rings don't work well/tend to distort and crush.
Dimensions of the original Keihin drain bowl red fiber washer:
o.d.: 8mm
i.d.: 6mm
So the actual sealing area under the drain screw area is 1mm all the way around.
Those small fiber washers apparently aren't a typical hardware store or auto parts store item.
Any one have a source for these small red fiber washers?
PW26 Drain Screw Fiber Washer
Have a look here: https://spaenaur.com/catalog/D10/
Although all the fibre washers are inch sized, there seems to be a good range of them and there's always a bit of wiggle room with washers anyway. Note that they also have washers in soft metals like copper that might also work. I'm fortunate enough that I can visit their sales desk and get advice from the clerks. Perhaps there's a similar company near you.
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