...The Syncro Spark processor has a range of either 20 or 26 degrees and full advance at either 4000 or 6000 rpm..Almost ALL engines use the 4000 rpm, 26 degree setting...
FPE made some engines fixed at 18 degrees..They run MUCH better when retimed at 28 degrees..
Mechanical advance systems can be set for whatever the manufacturer want to use, but setting up an engine retarded would be not in their best interest..
It's REALLY easy to lock the mechanical advance units at 28 degrees and put a Syncro Spark processor in series with the Hall sensor, just takes a male and female Dean's plug and about 5 minutes soldering time....
Can't be done on the FPE engines with 18 degree fixed timing, the hub is in the wrong place on the crank....Either re locate the sensor or the hub....