Originally Posted by Mauve

Go motors generally come with 3 shims installed on the head button, 2 x alloy and 1 x copper. Pull 1 of the alloy (silver) shims after you have broken it in fully ie after a couple of gallons and run the 0801 Pipe (any brand 0801, Go, PR, Aplus etc all come from the same place) and the Go's go like crazy! Also, may need to go to a colder plug, I was typically running P4's, had to go to P5's or P6's after as P4's wouldn't hold together after pulling the shim.