"In 2004, Yuasa Japan merged with Japan Storage Battery to form GS Yuasa Corporation."

So, its a Yuasa-ish battery

http://www.yuasabatteries.com/history.php

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XTX 2011. Yamaha Hand Guards, Akrapovic slipon mufflers, Snorkel removed, Airbox drilled, AIS Blocked, PCV, Dynojet Autotune, Kev O2 Controller, Dna Stage 2, KN air filter, mini indicators, steel sprocket cover, cnc levers, cnc mirrors.