Protect your marine investment with MERCURY factory part 64878. factory engineering designed for your exact engine — exactly what your engine was designed around. Quality matters when you’re on the water. Aftermarket parts often fail when you need them most. MERCURY factory components aren’t just better — they’re engineered specifically for marine duty with reliable performance. Precision manufacturing, proven materials, exact specifications. Not aftermarket guesswork, but OEM reliability you can trust. MERCURY part 64878 delivers reliability you can trust — exactly what your engine needs. Factory engineering means reliable starts, smooth operation, and fewer surprises on the water. That’s been our experience after four decades in marine parts. FITS: Specific Models/Years: Compatible with various Mercury/Mariner/Force V135-V200 (1984–1998) models. Fits V6 3.501 Bore 2.5L EFI 200. XR-4 (1991), XR-6 (1992-98), Magnum II (1991), and Magnum III (1992-98) STAY OUT ON THE WATER LONGER WITH GENUINE OEM PARTS FROM US BOATWORKS. Over 2 million parts in stock including NLA and hard-to-find parts. Can’t find what you’re looking for? Call or text us: 913-342-0011