Filled engine with coolant. Filled engine with oil; pressurized and got 30psi when spinning prop. Filled gas tank with two gallons. Got fuel pressure. Turned on master, throttle full idle, choke on, Skyview on showing oil and fuel pressure, both ignitions on, turned starter key and got Brrrrrrrr sound. Engine did not turn over or start. Checked fuses and none were blown. Battery at 12.5v. Tried to start engine again with no choke and full idle; still got Brrrrrrrr sound with no prop turn or engine start. Any suggestions on what to look for to get the engine to start?