A change interval of 300 hours is required for engine longevity and safety. In the case of engines with added boost pressure over stock, these spark plugs are required. If the engine is used for any form of racing or extended wide-open-throttle sprints, USP highly recommends upgrading the spark plugs for engine longevity and safety. USP recommends upgrading the engine’s spark plugs to NGK Laser Iridium Max+ Performance Spark Plug.Īll spark plugs come pre-gapped with a 0.8 mm (0.0315 in.) gap. This is vital to remove heat from the cylinder head in the Mercury Verado engines. The NGK Laser Iridium Max+ Performance Spark Plug spark plugs operate at one heat range colder than stock, which results in better pre-detonation resistance and spark plug life under extreme conditions. You may also find the Champion spark plug code helpful. Please view the inboard & outboard motor application guides below. Energy is transferred from the ignition coil to the plug which creates a spark igniting the air-fuel mixture. Outboard Motor Brand Inboard Motor Brand Champion spark plugs are original equipment on many outboard & inboard motors and are excellent replacements for everyday engine maintenance. Search: Mercury Outboard Spark Plug Chart.The Champion QL78YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear NGK Spark Plug Specification Chart 56 NGK Racing NGK Standard Part No If you don't see the part you need, simply call us toll-free at 1-80 1997 yamaha 90 hp. Spark plugs are responsible for providing an ignition source inside your engine’s combustion chamber. Search: Mercury Outboard Spark Plug Chart. The use or installation of this product outside of the intended closed circuit racing purpose may be illegal under the Federal Clean Air Act (42 U.S.C. The tables below will allow you to match your Honda and Tohatsu outboard model with the correct spark plug that you require.

Mercury outboard spark plug chart