Lean angle is your friend aboard the sportbike 125 GP replica from Aprilia - the track-only RS125.Launching from a stop requires some clutch finesse as the little one dinger doesn’t have anywhere near the amount of torque as a 4-stroke engine. As you accelerate the Single seems to gain momentum in protest. But as the rpms progressively increase, the engine begins to spool up quicker. That glorious 2-stroke “braappp” matches engine speed and as soon as the crankshaft spins to that magic 10,000 rpm, the engine springs to life and finally rewards its riders with some decent acceleration. Remember to shift though, because if you keep the throttle pinned for just a few seconds longer, the fun is over just as quick as it started.
Out on Willows Springs International Raceway’s 1.8-mile Streets of Willow course, the six-speed transmission does an admirable job of keeping the little engine zinging for most of the track, although the final drive gearing is defiantly on the tall side considering the engines modest power output. Going up both the front straightaway into Turn 1 or onto the back straightaway, you’ll defiantly be wishing for more juice. Everywhere else you’ll be giggling inside your helmet, for what the RS lacks in the power department, it makes up for in handling. power kit, designed exclusively for racetrack use, is also available as an optional accessory to achieve the full potential of this amazing two-stroke engine. The kit includes: * Racing expansion chamber exhaust * Complete racing exhaust valve * Control unit and solenoid for racing exhaust valve * Needle, main jet and atomiser for full power carburation * Racing spark plug The article doesnt mention this important tid-bit ...
