Okay… I’m gonna give these guys a try. It seems to me that this could save folks some moola.
JBM "How to Measure" the motorcycle CV carburetor diaphragm goove.
How to measure the carburetor body to determine what size CV diaphragm you need and if JBM Industries has a part that might fit your vintage motorcycle. A chart showing the dimensions of the diaphragms we manufacture and notes on what motorcycles they fit.
jbmindustries.com