Sounds like he will need to give it a power boost to be able to hold those speeds.
Roller weights are cheap, but you either get speed or takeoff power. Most of these scooters are someplace in between.
If you set it up for speed he may be able to go 40mph, but it will not pull a hill very well. Likely 20mph up a hill.
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You meet the nicest people on a Honda Clone.
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