Power-to-weight ratio

[WRT]

Given that thet Aprilia SXV550 has around 70hp and a weight of just 128kg, the power to weight ratio according to my calculations is 406kW/ton.

Talking to Strada about the SXV a couple of months ago, apparently they only have 70hp if you derestrict them. Supposed to be not much more than about half that amount from factory, and if you derestrict them the warranty drops to 4 months (this is for road riding, naturally no warranty on competition use).

Stink, eh?

[disenfranchised]

I do actually think their sums are slightly suspect. The learner legal bikes are to have engines no bigger than 660cc, and a power to weight ratio no greater than 150kW/Ton.

Not just suspect either??
I looked up The Indian Scout 741, cause the name suggested it was higher than 660cc. Didn't turn out to be relevant, but at a claimed 30.5 cubic inch capacity that makes it 1.27L, almost double the limit they're supposed to be imposing.

I like the concept, but given that a lot of these might be being sold in "restricted" mode how could they enforce it.
People would be riding round on "approved" bikes, but would have done the required tinkering to release their full power.

Sounds like the potential for trouble.
Surely something like our Moped law would be better
Maximum capacity 250cc
AND Maximum Power < 25kW
AND Maximum Speed < 120km/h

That way there's only limited scope for modifications to get around the rules.