thanks for the reply , any info on 75s or 100 QUADRAS apreciated. i also have a Q100 and the SDC on it has a very modified
throttle linkage . it also has a CH Ignition. the 75 cylinder is the same one used on the canadian Pioneer p-51 chain saw.

i'll just run the small carb , for now . parts are almost impossible to find for these old beasts.