Depends on how competitive he is? Formula Blue and Aixro both run at 185/190kg, with a Aixro weighing 95kg, Simon has mentioned the weight for the blue in the previous post.
If your just running practice then he'll be ok, if your in race series, I'd look towards super heavy weight.
Also he needs to use the weight to get the kart round, he'll need to lean forwards out of corners, to remove weight from the back and he'll need to try to lean in to the corner to help turn the kart. Weight shifting makes a BIG impact, I'm a little over my min weight limit in my kart and I find the weight shifting makes all the difference.
He should also find that he can be the last of the late breakers, he should be able to use the weight to slow the kart down.
Of course, this will only be a small help, but it might make the difference between him and the next few karts in front.
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