Mercury - Quicksilver 816761Q7 Spark Plug Wire Kit V6 MerCruiser Engines (229 CID) Points Ignition 816761Q7. Overview. If your old MerCruiser V6 is starting rough or missing under load, weak plug wires might be the culprit. The Quicksilver 816761Q7 Spark Plug Wire Kit gives your 229 CID MerCruiser engine (1983-1984) the spark energy it needs for smoother running and stronger performance. Designed for conventional points ignition systems, this OEM wire set restores clean ignition and reliability