Wy is a Wuyang motorcycle, wh is a Wuyang Honda motorcycle, and the quality and performance of Wuyang are far less than that of Wuyang Honda. Just like the Pentium b70 and Audi a6 produced by Changchun FAW, but the quality and performance are absolutely different. There are many reasons for power drop: poor gasification or incomplete blockage of oil melter, cylinder pressure drop (the main reason for cylinder pressure drop is large annular gap or air leakage), unclean gasoline filter, aging spark plug and ignition wire, and unsmooth air filter ... There are many reasons, so check slowly. If you have poor hands-on ability, ask a motorcycle mechanic for help!