In the old, old days, buying a restricted (2 stroke) moped demanded that you invested in a set of Riffler Files and gently filed a mm or 2 from the exhaust port roof.
Then, pleased with the new 'power' band you had created, you took another mm from it. Then another. Until you had created an unridable monster where all the power lived in a 200rpm band somewhere north of the red line.
Basically, you'd wrecked it.
<sigh> Those were the days.
Right, where were we? Ah. Winter gear in California.
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<snort>