Espada Racing big valve cylinder head kit for improved intake and exhaust air flow over the factory cylinder head. Recommended if you already have a big bore kit upgrade. This Superhead type cylinder head has Intake inlet ported with "8" shape for even more airflow.
This cylinder head is plug and play for 2014-18 Yamaha (R15 V2) engines. For V1 models you can fit too, exhaust fitting may be tighter. Or you can search for R15 V2 racing cylinder heads.
Yamaha YZF-R15 V1 V2/MT-15/Xabre/M-SLAZ
Yamaha FZ150i Vixion (2014-18)
Yamaha Y15ZR/Jupiter MX King/Spark/Exciter/Sniper/T150