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I guess that would depend on what bike you're talking about. The YY250T is geared for fuel economy and top speed, not acceleration, and will (if the cooling system isn't borked because you left the shipping fluids in it or didn't bleed it properly) run at 65-70mph until you run out of gas. It doesn't even get to 6000rpm, so it isn't going to shorten the engine's lifespan.
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