Would 5w30 synthetic oil be recommended for a 2006 Yamaha ttr 230?

No, 5W-30 synthetic oil is not recommended for a 2006 Yamaha TTR 230. The manufacturer's specifications typically call for a specific type of oil, usually a 10W-40 or similar motorcycle-specific oil, to ensure optimal performance and protection of the engine. Always refer to the owner's manual for the correct oil type and viscosity for your motorcycle.