Hi Guys, I just finished building my first 28 briggs flatty racing engine and am having trouble getting it started. It has a 28 head and a precision 246 cam with walbro adjustable carb. It turns over untill it hits compression stroke then stops. I back it up and it will occasionally fire then stop before it hits compression stroke again. It turns over great without spark plug in it.It is the bigger of the stock starters but is not the nippodenso starter. What i need are some rough settings for the carb mixture screws. I currently have the stock flywheel key in it to try to minimize starter kickback because of timing. Any help would be greatly appreciated. Gary