Mercury - 100 Hour Maintenance Kit Routine Service 8M0232733. OverviewThis kit's meant to make the 100-hour service a quick, no-nonsense job. Everything you need is already in one box, which saves a lot of back-and-forth when you're trying to get the motor ready for another stretch on the water. These 40-60 horsepower FourStroke EFI engines run smoother when they're serviced on time, and this takes care of the basics. Nothing complicated-just routine work that keeps the engine behaving the way i