![]() You dismiss the article in my link as an "opinion" rather than a techincal "exlanation" I, therefore, look forward to reading your explanation for the reasons OMC recommended only inductively suppressed plugs for use with their CD ignition systems. PROTECTOR, SPARK PLUG END (6 required per assembly) 85-63709A 1 - Boot Kit - Black - Priced Individually More info 7.90 9 In Stock. ![]() Reference numbers in this diagram can be found in a light blue row below scroll down to order. I prefer the softer approach, particularly with questions originating in the UK where Champion plugs are not so readily available, namely to suggest the nearest equivalent NGK plug. Mercury's Verado require specialized maintenance more often, which can be performed only by a. Mercury Marine 90 hp (6 cyl.) wiring harness and ignition coil parts. The hard line approach would be to respond to all questions about plugs by saying use only the engine manufacturers recommended plugs! In the case in point this amounts to QL77JC4 or QL78YC. NGK plugs have bad reputation when used in Johnson and Evinrude outboards which I suspect is not because there is anything wrong with NGK plugs, au contraire, but because in the absence of inductively suppressed NGK plugs until relatively recently, resistor plugs were recommended and used with sometimes disappointing results. Spark Plug Champion QL77CC Mercury 3.0L Stock 941M Cross Ref : 33-941 Mfg. Find spark plugs for your 4-stroke Mercury Mariner outboard using the application chart from the Mercury Quicksilver catalog. They can maintain stable operating temperatures under varying loads. Only the Z series from NGK are inductively suppressed. Mercury Outboard Spark Plug Replacement - YouTube. AC Delco Specialty Marine Spark Plugs are everyday replacement plugs designed for reliability and efficient performance in jet boats, inboards, outboards, and personal watercraft. Q series plugs are low resistance inductively suppressed plugs. The facts are that OMC recommended only the Champion Q series plugs with all their engines with CDI. ![]() I apologise for not prevously stating the source of the article. Use the unsuppressed B7HS if you cannot get the BZ ones.Ĭlick to expand.The article in my link, which is a direct link to the article on the author's own website hence the URL, is one of a series, mostly but not exclusively, on outboard engine technology written for the (Australian) Instutute of Automotive Mechanical Engineers (IAME) member magazine - ?The Automotive Engineer?. I think after I had retuned the second set to them they sent the whole boxful back. I had a car many years ago that was a bit particular about its plugs and the motor club at work got bad batch. However, it will be better if you change the spark plugs in your Mercury outboard motor every year or per 1000 hours. I am not surprised about bad experiences with Champions. By Gabriel Roy Posted on NovemUpdated on NovemDo you know when your Mercury spark plug needs replacement Mercury outboard comes with reliable spark plugs, so you don’t need to replace it often. I always seems odd that only Champion plugs are now recommended for older ( pre CDI) engines for which AC or Autolite plugs were listed as alternatives when they were first supplied I also wonder if there was some commercial deal between OMC and Champion. You still find them on some lists but the OMC CD system does not like them. As a result the NGK resistor plugs were supplied in their place. I suspect the problem has been that the Champion Q series plugs were developed specially for the OMC CD ignition and for a long time there was no NGK equivalnet. Most of the world prefers NGK plugs but as I said the official line is that only Champions are now recommended for OMC engines and folks on this forum will support that. although they are the plain old non-suppressed B7HS. I'd use then happily ( in fact i have a set of NGKs as well as the original Champions for my 6hp Evinrude. Our technicians and Mercury recommends replacement at the 300-hour service maintenance interval.BZ7HS ( or BZ7HS-10) are the nearest NGK equivalent to QL77JC4 Energy is transferred from the ignition coil to the plug which creates a spark igniting the air-fuel mixture. Spark plugs are responsible for providing an ignition source inside your engine’s combustion chamber.
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