THE CABLE that connects to the 2nd gear was meant to prevent hiccups when you close the throttle suddenly, this info was told by authorized YAMAHA mechanic, this was implemented in the 2nd gear because usually you stop and go frequently on that gear position
one more thing, the standard CDI has 39 (!) ignition mapping controlled by the TPS sensor, so the correct mapping will boost your engine power and vice versa.
the standard setting from the factory limits your engine rev up to 8000 rpm, if the TPS adjusted to 0,6 - 0,7 V (0,5V is the standard) the engine can rev up to 9600 rpm max.
And the only way to adjust the TPS is to?
untighten the TPS screw, plus a multimeter set to DC Voltage (V), plug the positive to the blue wire, the negative to the yellow wire (use a needle clamped with an alligator clamp from the multimeter). While you're still doing this move the TPS clockwise and see the reading on your multimeter
one more thing, the standard CDI has 39 (!) ignition mapping controlled by the TPS sensor, so the correct mapping will boost your engine power and vice versa.
the standard setting from the factory limits your engine rev up to 8000 rpm, if the TPS adjusted to 0,6 - 0,7 V (0,5V is the standard) the engine can rev up to 9600 rpm max.
And the only way to adjust the TPS is to?
untighten the TPS screw, plus a multimeter set to DC Voltage (V), plug the positive to the blue wire, the negative to the yellow wire (use a needle clamped with an alligator clamp from the multimeter). While you're still doing this move the TPS clockwise and see the reading on your multimeter