A sport bike like a 600cc inline four, has to launch at some ridiculous high rpm to stay in its "power band", so setting at a light requires him to hold that rpm until the light changes.... which is silly if a light is 3 or 4 minutes long and theres a decent chance he'll spin the tire or wheelie if he's too excited. Most of our bikes (1000cc and up inline fours) can launch pretty quickly with just a few thousand rpms and not blow the tire off it. A big twin can launch pretty respectably just off idle, but they run out of breath pretty quick. So from a stoplight a big twin can do ok ill the next stoplight... if its not too far away.
At the dragstrip, with predictable lights and good traction, the situation can change allot (with practice) allowing the smaller, high RPM, bikes to launch hard and do pretty well... and the big twins weight and lack of horsepower usually leave them way behind.

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