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). Forged 62mm piston will increase your motor's displacement from stock to 177cc(178cc). This kit is made for the Yamaha YZF-R15 150cc motorcycles. Also fits models like the R125, WR125, MT-125 using the same engine.