i guess u have never ridden a honda rs 125, apprilia rs 250 and a suzuki sv 650. although the sv 650 makes move bhp than the rs 125 the weight difference is the main factor, the rs 125 was probably on slicks as well. i have never raced a rs 125 but i did a couple of laps of old snet on one. i loved it i may of been going slow for what the bike could but i was not hanging about but i scared myself.
when i raced at thruxton on my sv 650 i forget which club it was but they had the 250 gps there the fastest bike all day was a honda rs 250, they made the 1000s look slow.
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if dont fall off every now and then your not trying hard enough