Hi Matthew, & everyone,
Here is some information about Whizzer carburetors, first the carburetor you purchased wasn't the original version used on the early NE motor. The early NE motor used a carburetor made in Tiawan, not Japan. The original Whizzer version was a "PD", not a "PZ". The original Whizzer 26 MM cost a lot more, but was a Bolt on item, whereas the "PZ" versions usually require some "tuning" to work correctly. The original Whizzer unit had a 100 mail jet , but the "PZ" has a 92. I am working with several owners tyring to figure out the correct jets & settings to work smoothly on the Whizzer motor. Here are a few comments that might help concerning the 22 & 26 MM carburetors, first the float height on the 22 MM is 22 MM, and is 14 MM on the 26 MM carburetor [bend the tab holding the shut off valve on the float to arrive at the correct height]. The measurement is taken [with the float bowl removed] with the carburetor turned up side down, with the float resting on the shut off valve, measure from the top of the floats to the bottom of the carburetor housing. One word of caution, if you get the float bowl gasket on the 22 MM carburetor wet with gas it will swell up, and you will have to wait until it shrinks down to size before re-installing the float bowl. The idle mixture adjustment is different between the 22 & 26 MM carburetor, on the 26 MM the adjustment controls fuel, and on the 22 MM it controls the air, so clockwise on the 22 MM is reducing the air and making the carburetor rich, but on the 26 MM clockwise will lower the fuel and go lean. The normal main jet is 88 on the 22 MM carburetor. The normal setting for the idle mixture screw on the 22 MM is 1 - 1/2 turn out, and one turn out on the 26 MM version.
Have fun,
Quenton