Here's a note I sent Kurt at 45" Parts Depot:
Hi - glad to see someone is making this stuff. A comment? You currently offer 2 venturis: 15/16" for the M-88 etc., and 1-1/16" for the M-41, 51, etc. Have you considered a 3rd variant, with very little work involved? The M-88 is very common, but useless on a hot 45 or UL - too small. Installing the bigger (M-51) venturi directly
does not work - vent type is wrong. Another useful part could be made by simply cutting a vent notch (as found in the 15/16" model) in the leading edge of your M-51 venturi to match the M-88's function. This provides an easy flow increase to M-88 owners, and also an excellent replacement for the M340 & M640 Indian models which all use internal vent as well.
If this is of interest to anyone - let him know!!
Click here to read about my Linkert Book