Those features include Transient Spark Technology that optimizes 300R timing advance for more torque on hole shot. The 300R is offered with a choice of the standard tri-ram midsection with high-durometer upper motor mounts and solid lower mounts or the HD midsection with solid upper and lower mounts, a forged transom bracket and remote trim pump, and an integrated rear tie-bar mounting plate. The 300R also has the nifty Top Cowl Service Door that permits oil checks without removing the cowl plus a quick-release cowl latch system with a built-in carry handle. An 85 amp alternator gives the 300R more charging power than the 70 amp 400R alternator, and the 300R has Idle Change battery management that raises idle rpm and charging power when it senses battery charge is low. Finally, the Racing 300R makes full power on 87-octane fuel while Mercury Racing recommends 91 octane gas for the 400R (although it will survive on 89 octane fuel), plus the 300R has Advanced Range Optimization (ARO) which uses a closed-loop sensor system to lean out the fuel mixture for best-possible efficiency for the given condition. In short, the Racing 300R offers a list of advanced technology – from light-weight die casting to electronic controls – that have been developed since the Verado-based 400R was last updated.