Pound for pound four stroke tuning is less rewarding than two-stroke tuning.
Source: 27bhp PM Tuning Vespa Sei Giorni – Part 1 | CUSTOM – ScooterLab
Pound for pound four stroke tuning is less rewarding than two-stroke tuning.
Source: 27bhp PM Tuning Vespa Sei Giorni – Part 1 | CUSTOM – ScooterLab
Two Bit Scooter Club 