I hate to ask, but are you sure that mag has the right firing order? Many Fairbanks were adapted without changing the point cam, with the thought "3 degrees is no big deal".
What is the exhaust pipe OD?
Panic, the poiunt cam has been redone to Hunt's Indian spec
the exhaust OD is 1.5" ID is 1.25", they are temporary pipes nicked from my 741B basket, I plan to use 2" OD stainless - once I find out the correct tuned length for my engine?