Starter kick back is when the starter has a very hard time turning over which should not ever be the case and sometimes you can hear the starter struggle so much that it actually has a kick back like its “Kicking Back.” The resistance is to much and SPRING! It “Kicks.”
The adjustment(s) are the slots that the mechanical weights slide in. You can get a plate limiter from FBO @ foursecondsflat.com.
An adjustable vacuum can is needed to limit the vacuum timing and limit the slot to limit the amount.
