Other commentary…. I think I now understand how the cam roller works with the throttle. I don’t have a indicator band on the handle so hard to know “where” start is supposed to be, but I did look thru a book I bought of “cheap outboards” which has a good diagram/explanation of this…. currently by the time the roller hits the indicator the throttle plate inside the carb has already moved a bit, and not the book explanation of that the roller should be at indicator when the slack in the linkage just starts to turn the carb plate open.
So, sounds like the carb is opening a little sooner than expected at the indicator, any ideas how this would make the motor behave at this timing? Would adjusting it back some make it idle even better?
Again, not sure I understand what you are describing here. Cam roller pick up adjustment is not necessarily the “start position”. The carb butterfly should just begin to start opening when the line on the throttle cam bisects the rubber cam roller. This adjustment can be tricky due to all the slop in the carb throttle linkage. In other words, the linkage rods might start moving at this point, but that doesn’t mean the butterfly shaft is actually starting to open due to the somewhat normal “slop” in that linkage…
The engine will run a bit lean off idle and bog on acceleration if the carb butterfly shaft starts to open before the mark bisects the roller
The engine will run a bit rich off idle and may stutter on acceleration if the carb butterfly starts to open after the mark bisects the roller.
Again, this adjustment is to synchronize the carburetor and ignition system and has nothing to do with the start position on the tiller twist grip. The engine can be started either above or below this position.