Speaking with @BriggsRacing yesterday over email and David was kind enough to take the time to type out a brief summary for us:
The ‘changes’ basically are:
Implementing a static timing check to simplify tech (verses a timing light to find running timing).
Push rods we created a consistent measuring approach and reduced the diameter by .002". > This was to address the possibility of the tubing to distort during the press fit of the ball ends. Measuring all the way around ensures a proper reading anywhere along the tube.
Allowing temperature thermocouple as long as the lock washer and spark plug are not modified.
Creating a universal air filter ruling - Sanctioning bodies had different rules concerning whether > an air filter that comes off on the track was a DQ or not. To standardize this for consistency.
A reiteration of the use of factory fasteners. We had a few cases where racers went to studs when the rules specifically say you can’t. We just highlighted this in more thank one area.
Tech clarification - A tech official can use additional measurement methods when comparing against a known stock part. We wanted to give tech officials more options and flexibility to prove > a racer compliant.
~David Klaus, Briggs Racing
So overall, nothing major that racers should be concerned about from what I interpreted.
@Eric_Gunderson wrote a detailed rundown of the changes on The Colorado Karter:
We made a quick shareable video too.