Gear Repair Kits Sterndrive Gear Case/Lower- Lists all gears and gear repair kits for Mercruiser lower units Alpha & Bravo XR drives. Gear Repair Kits Sterndrive Driveshaft/Upper - Lists all gears and gear repair kits for Mercruiser upper driveshaft housings including Alpha & Bravo XR drives. 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.Find your OEM parts and part numbers easily to get the correct items by using our Mercury/Mercruiser charts for various repair & maintenance kits, marine engine oil recommendations, gear lube capacity, water pump repair kits, etc.Īctive Trim Part Number Lookup - Look-up your part number for the correct Active Trim for your engine hereĪnalog Tachometer Selection Chart - Find the correct part number for your analog tach gauge hereĬarburetor & Carb Repair Parts Chart - Look here to find part numbers for new replacement carburetors and/or parts and kits for your carburetor.Įngine Oil Recommendation Chart- Check out this chart to determine the engine oils available for your Mercruiser engine or Mercury Outboard.įourStroke Outboard Water Pump Repair Kits Chart- View this chart to find your part number to repair your water pump (including impeller repair kits) on your Mercury 4 stroke engine. 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. 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. Only the Z series from NGK are inductively suppressed. 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. I am not surprised about bad experiences with Champions. 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. BZ7HS ( or BZ7HS-10) are the nearest NGK equivalent to QL77JC4
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