Frankie
I Build and Run Ported Saws !
The picco chain needs to run a picco sprocket or in this case a .404 turned down to the diameter of a picco sprocket - the picco sprocket spline will NOT fit on a larger clutch drum ... If you try and run a 3/8-7 with picco chain you will hammer the snot out of it in short order , even though both chains are 3/8 .05 the drivers are different lengths