BakerBoy
It's all small stuff.
- How does a person know if they should have their starter valves synched?
- Is there some type of indication from the engine or throttle response that indicates a synch is necessary?
I am over 90K and have never had my starter valves synched.
To the first bullet: idle isn't as smooth with out-of-synch starter valves. And if left idling, cylinders won't equal temperature as they won't be firing equally, and you can more easily foul a plug or two.
To the second bullet: the moment you quickly and largely twist the throttle while the engine is still at idle, it could stumble before rpm increases depending on whether a 'good' firing cylinder is next to fire or a lame one (due to absence of airflow). But unless the butterfly valves are closed, the starter valve synch has negligible affect airflow or fuel flow to each cylinder. Said another way, a person can completely open or completely close the air bypass that the starter valve adjustment affects and NOT affect airflow and fuel mixture into each cylinder when the throttle is open (when the butterfly valves are open) any appreciable amount, and engine has a load on it.
I'd speculate that you'd notice a better idle and would have to turn down the idle speed adjustment once a synch was performed. But it is otherwise not a strong player in throttle response or engine behavior.