CDI HARNESS: MERCURY / MARINER 40-150 HP '70-'85, 414-2770, 46905, 52770, 52771,

CDI HARNESS: MERCURY / MARINER 40-150 HP '70-'85, 414-2770, 46905, 52770, 52771,

Marsoni

M251S

$127.49

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CDI HARNESS: MERCURY / MARINER 40-150 HP '70-'85, 414-2770, 46905, 52770, 52771,ITEM#: 414 2770 HARNESS: MERCURY MARINER 40 150 HP 70 85 OEM#: 46905, 52770, 52771, 56370, 84 66055, 84 66297, 84 69236, 84 71443, 84 73826, 84 74904 BRAND: CDI ELECTRONICS HARNESS EXITS THROUGH THE SIDE OF THE COWLING. FITMENTS: Make Model Year(s) Mariner ALL Mercury 2 Cyl 2. 875 Bore Cross Flow 40 1970 1979 Mercury 4 Cyl 2. 565 Bore Cross Flow 50 1970 1975 Mercury 4 Cyl 2. 875 Bore Cross Flow 85 1973 1975 Mercury 4 Cyl 65 1970 1971 Mercury 4 Cyl 80

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I decided to try LIQUI MOLY Valve Clean to help keep the intake valves clean and maintain engine performance, and I’m really impressed with the results. After adding it to the fuel tank and running through a full tank of gas, the engine felt noticeably smoother and more responsive. It’s very easy to use—just pour it into the fuel tank as directed. I also like that it’s from LIQUI MOLY, a brand known for high-quality automotive additives. While it’s not a miracle fix for serious mechanical issues, it’s a great preventative maintenance product to help reduce deposits and keep the engine running efficiently. I plan to use it periodically as part of my regular maintenance routine.

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Reviewed in the United States on March 7, 2026