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You are probably both a bit over the upper limits of a 250cc. My Honda Shadow 750 only uses 120 mains. My 600 uses 114 mains.
You don't just keep shoving in fuel and going faster and faster. After you pass the air/fuel top limit you start pushing fuel into the exhaust and burning it when it hits the oxygen.
That limit is a 115 jet on my TBR7. Past that it resembles riding a roman candle down the road as the gas dumps and explodes. I had to back off of a 117.
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