The first step in getting more power from your machine is to go for a bigger displacement bore up kit. More power = more happiness.
UMA racing big bore cylinder kits are plug and play ready for your machine, built to standards exceeding the manufacturers for worry free use. Ceramic block material will withstand extremely high temperatures. Available with flat or domed pistons (for use together with the UMA Superhead). This kit is made for the Yamaha R15/Fz150i/Vixion. Also fits the R125 and WR-125 models with the same engine. Forged 62mm piston will increase your motor's displacement from stock to 177cc(178cc).