I had my engine rebuilt and installed it in the kid without drives and oil cooler so that I could time the engine and break it in before mounting up the rest of the hardware. Now that the Kid is fully assembled and running, I wonder how kid owners time their machines with the timing hole covered up by the oil cooler? I thought I would be able to see through the oil cooler enough to find the timing hole on the flywheel shroud. Does not look possible. The Kid manual references a timing disc for use on the rear output shaft, do any of you use one? Are you guys just timing by ear? Any help would be appreciated. I assume too retarded generates heat, and too advanced creates a backfire through the carb. Too retarded equals engine destruction, too advanced runs poorly. Sounds like the error should be towards too advanced? Thanks, Bill