cosgrove, how do you know you have the correct setting on your carb? Do you set it the same each time? If you do this should be a guide line only, and adjusted as needed. Personally I,d let him adjust the carb, its best to do this on a test day with a non race motor, the adjustments needed will be very small.
Don't expect him to feel the differance straight away, it will take time and lots of practice, no 9 year old can immediatley feel what the motor is doing.
Do you do split lap times or just full lap times, if you only do the full lap this will give you very limited info on what any changes have done, ie 2/10 slower or 2/10 quicker, the key to it is were are you quicker and where are you slower.
When you changed the sprocket 4-5 teeth and there was no differance in lap times on a full lap, it you had done split times, say 3 splits, you will have seen a big differance in the splits, ie some will be slower and some faster, but giving you the same overall time.
When you time the fast boys do splits on them to, this will tell you where you are lacking speed, you may be the same done the spraight but 2/10 slower out of each hairpin, this will guide you in the right direction on where to find more speed.
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