Although we hated it at the time, we were lucky enough to start in a class where all the parts on the kart and even the track width was fixed. Enabled us to have no other option but concentrate on the driving.
Your lad will need to be winning club races and be able to put in multiple laps on the same 10th before you will even see the difference in hubs, let alone axles. Make sure you have the standard parts and then stick with them. When he is ready spend a day testing just one variable like front width, go from one extreme to another, see the difference in the time along with his feedback, then do it again blind and see if the results are the same. When they are, move onto something else, I once spent 3 whole days just testing tyre pressures with both my kids. We camped at the track, which we had virtually to ourselves, with 3 other families, one of the best and most memorable experiences of my life.
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