The genuine reserve tank has a small capacity and may cause cavitation after running at full throttle.
Since the water temperature tends to rise when cavitation occurs, we have developed a 2.3L (larger capacity than SPEC-V) aluminum reserve tank for Top Secret.
Since the internal structure has also been fundamentally reviewed, it suppresses the heat tendency of water temperature.
Comes with a level gauge that allows you to check the amount of water in the tank at a glance.