might be on some other machines but i have only ever seen them on old masports so far . whirlwinds ! . and there are at least two different diaphragms for those . but if its starts and runs well . same old story , is it ain't broke dont fix it , they can be a pita to get the choke correct . maybe it was a powertorque base , same bolt pattern . one extra hole on one side is there ?
