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I have no experience with the RX3 (yet) but I do have quite a bit of experience with big bore kits, and my advice is don't. The bottom end and transmission were not designed for more power. More power equals more stress on engine parts. In every case where I have installed a big bore kit, it has noticeably shortened the life of the engine, decreased reliability, and in some cases broken the engine. I gave up. My feeling now is if you need more power, get a bigger bike where the whole engine and transmission is designed to handle the power it makes.
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