From Pikipedia, the Pikmin wiki
The Omega Flywheel (オメガ・ブースター?, lit.: "Omega Booster") is a treasure in Pikmin 2. This item is actually just a worn, rusty gear. It can be found on the third sublevel of the Subterranean Complex. There are quite a few Armored Cannon Beetle Larvae and fire geysers in the area, so remove them before trying to transport the treasure.
“Collecting all these machine parts reminds me of the time I crash-landed on this planet. The last time I was here, the crash scattered 30 of my ship's most crucial components. I had to frantically collect all of them before life-support systems failed. I wonder what kind of machine this flywheel is from.”
“Gravitational, electromagnetic, centripetal, dynamic, centrifugal... More powerful than any of the myriad forces of physics is this: the largest, strongest, fastest, coolest flywheel of all time! It is so powerful as to be immeasurable, so there is no way to confirm its astonishing potential.”
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