Yamaha YZF250 2019-22 YZF450 18-2022 Twinair Iboost throttle body power flow kit
NEW TWINAIR IBOOST POWER FLOW THROTTLE BODY INSERT. YZF250 2019-2022. YZF450 2018-2022. For better top-end throttle response (90-100% open throttle position), use the kit’s larger butterfly valve without the sleeve.