Re: Y in spark plug code
Back in around 1995, the then OMC along with Champion Spark Plugs, redid all their previous recommendations. A lot of the motors received different spark plug suggestions, and new plugs were added to the lineup, such as the "Y" style extended nose plugs.<br /><br />Service bulletins were issued and the official spark plug charts were changed. <br /><br />QL78C plugs will not hurt your motor but you will get better drivability with the QL78YC style of sparkplug.