NGK BKR6EQUP are … We take a look at how spark plug socket sizing is determined, at least here in the UK. With its clear commitment to delivering the highest quality and continuously raising the bar, NGK Spark Plugs is the obvious brand of choice for an array of vehicle manufacturers. Motorcycle Spark Plugs from the UK's leading online bike store. What are the common motorcycle spark plug sizes?Thread diameters of 10mm, 12mm, and 14mm are the most common. A -8 should be gapped to .8 mm or .032″, -9 should be gapped to .9 mm or .035″, -10 should be gapped to 1.0 mm or .040″ and -11 should be gapped to 1.1 mm or .044″. The letters “IX” indicate an iridium center electrode. The letter “P” indicates a platinum center electrode. The letter “S” indicates a copper center core. There are many different causes of spark plug fouling. However if you use Iridium spark plugs they will last a lot longer, usually well over 30,000 miles. It is best to use the heat range specified by the manufacturer. Spark plug size in inches Spark plug size in mm Socket needed Aplication; 5/8: 16: 5/8-16mm: Scooters, motorcycles, smaller cars: 13/16: 20: 13/16: Cars: 3/4: 19: 3/4: Lawn mowers/Small engines: 18: 3/8: Motorcycles: 9/16: 14: 9/16: Ford, Newer asian cars: 18mm bi hex: 11/16: BMW/MINI: 11/16: 8: 11/16: Older BMW: 7/8: 7/8: Rare We publish full color, online manuals to help you save time and money servicing ATVs, motorcycles, scooters and side by sides. The letters after the heat range can indicate a number of things. 2 Answers. A heavy accumulation of carbon on the nose can cause a leakage path to earth. QISF 2Pcs Thin Wall Spark Plug Socket Universal Joint Magnetic Flexible Socket Wrench Removal Tool - 14mm & 16mm. Need help with your ATV, Motorcycle, Scooter or Side by Side? TSP: £3.20 ex VAT £3.84 inc VAT If you’ve not changed your plugs before, give yourself a couple of hours to complete the task. A wobble socket / universal jointYou’ll be lucky if there’s a straight line to your spark plug, so a universal joint will get you the angle you need to apply some torque. Even when a plug is in good condition small deposits will accumulate. Fydun Double End Spark Plug Socket Wrench 16/18mm Galvanized Deep Reach Wrench Socket Tire Repair Tools for Motorcycle Auto Repair 130mm. RayPooley said: NGK BKR6EQUP is the stock recommended plug. 3/4 deep. 774 Hendersonville RoadAsheville, NC 28803 Save 37 % £5.80 INC VAT £4.83 EX … That's typically once every other major service. Over 7,000 bikers are in the club. A 3/8″ driveYou could buy a specific spark plug T-bar but your home tool kit will have the drive you need to connect to your plug sockets. “H” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. Here is an example of their basic spark plug code. Install each spark plug by hand until you have wound the thread a couple of turns. If the reach is too long, the piston could contact the spark plug, plus carbon deposits can build up on the spark plug threads. Lv 7. 0 0. guardrailjim. Click Here for Our Article on Spark Plug Maintenance & Installationcontents:Threads | Wrenches | Parts | Codes. on baskets over £250. It takes a 10 mm socket (that's 16 mm or 5/8" across flats). The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. As for what is the size of a spark plug socket, there is no standard universal size. There are currently three spark plug thread diameter and pitch sizes used on motorcycles and ATVs: 10 mm x 1.0, 12 mm x 1.25 and 14 mm x 1.25. Or, to put it another way, wot he said. There are three size spark plug threads and two reaches currently being used in motorcycles and ATVs. There are two size reaches currently being used in motorcycles and ATVs. There are three size spark plug threads currently being used in motorcycles and ATVs. A decent tool kit will have them. Most of mine are from the Halfords Advanced range (formerly called Professional). “B” indicates a 14 mm x 1.25 pitch size, “D” indicates a 12 mm x 1.25 size and “C” indicates a 10 mm x 1.0 size. The letter “U” in this location would indicate a surface discharge gap (no ground electrode). Pretty much everything you’ll ever need for any motorcycle maintenance job. Iridium spark plugs also have lower voltage requirements, meaning they perform better when starting and idling and some manufacturers also claim they offer a better throttle response. Engine power will be reduced and you risk piston damage. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. … The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber. The letters “H” or “Y” indicate a projected tip. They have a lifetime guarantee and for an amateur bodger like me, they’re perfect. Laser Magnetic Spark Plug Socket 14mm. Sort by . Answer Save. Dealers may access our complete library of manuals, plus unlimited specification look-ups through CYCLEPEDIA PRO – now just $99.95 a year or $19.95 a month! Please log in again. “N” indicates a 14 mm x 1.25 with a 3/4″ reach. The “P” indicates a projected tip spark plug design (1.5 mm projection) that moves the spark deeper into the combustion chamber. “L” indicates a 14 mm x 1.25 pitch size with a 1/2″reach. A spark plug socketYou’ll need a deep socket. Bob A. Lv 7. The “R” indicates a resistor type spark plug. Torque the spark plug up to your manufacturer’s recommended settings. We’ll only send you the good stuff. Whereas the threads are usually 10mm, 12mm or 14mm. Again, a decent toolset will have one. Please call or write if you have any questions as to fitment, 775-355-0655 or The letter “Y” indicates a V-grooved center electrode. If the engine is running lean then the spark plug has a grey colour but you’ll probably see some black deposits on there too. Unior 3/8" Spark Plug Socket - UK's best Motorcycle Store Free shipping over €100 Free size exchange Lowest Price Guarantee The number at the end indicates the recommended spark plug gap in tenths of a millimeter. The letter “G” indicates a precious metal center electrode. If the plug has oil on it, then it’s oiling up and may not work efficiently, potentially causing a misfire or stuttering under hard acceleration. Bikeservice Motorcycle / Bike / MC Thin Wall Spark Plug Socket - 18mm These Thin Wall Spark Plug Sockets can be used with either a 3/8" Sq Drive or a Hex Drive. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. THIN WALL SPARK PLUG SOCKET 18mm. This high-quality spark plug with a thread diameter of M12, thread pitch of 1.25mm and socket size of 18mm can fit many different models, but make sure to check the compatibility before purchase. However, modern plugs are almost all motorcycle-specific fit and so they come ‘pre-gapped’ and you won’t need to touch them. Amazon's Choice for motorcycle spark plug socket LEXIVON 5/8" Swivel Magnetic Spark Plug Socket, 3/8" Drive x 6" Total Length | Enhanced Magnetic Design with Thin Wall Socket, Cr-v Steel (LX-121) 4.7 out of 5 stars 731 “W” indicates a 14 mm x 1.25 pitch size, “X” indicates a 12 mm x 1.25 size and “U” indicates a 10 mm x 1.0 size. It is best to use the heat range specified by the manufacturer. Here are the most common spark plug codes by brand. Originally designed for Honda® XR400s as a trail tool but fits many models with 18mm plugs The thin wall socket is designed to fit into the plug cavity and allow the user to choose between the Motion Pro spark plug ratchet wrench, a 3/8" ratchet or 13/16" wrench as well as a tool kit bar or Phillips screw driver through a 8.5mm hole for removal and installation 18-06-10, 15:17 #4 Note; Do not use a projected tip spark plug where it is not called for as it could contact the piston and cause catastrophic engine damage. This reduces the chances of you cross-threading the plug. The number (24 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. Copper is generally seen as being the best metal to use in terms of conductivity but iridium plugs are seen as premium as they last longer than standard plugs and can be built with smaller tolerances. “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. Source(s): 35yrs lic mech 40+ yrs riding. definitely 18mm and gg's homebrand spark plug spanner Hi Itzli, I find the Kawa 18mm spark plug spanner very suitable for the job, I am always a little cautious starting the thread as it doesn't always "catch" the 1st time. Whereas the threads are usually 10mm, 12mm or 14mm. Narrow down your search by part type and part manufacturer using the menu on the left. If the temperature is over 850-degrees, pre-ignition may occur. Here are the essentials you need for smooth re-plugging: Your owner’s manualYou’ll need this to help you find the location of your spark plugs and how to access them. motorcycle spark plug socket size. The number (82 in this case) indicates the heat range of the spark plug, the higher the number the hotter the heat range (opposite of NGK and ND spark plugs). There are two size reaches currently being used in motorcycles and ATVs. The letter “C” indicates a copper core. Showing 24 of 303 items. Before you throw your old spark plug in the bin, check them to get an understanding of how well your engine is running. Features & Benefits of Halfords Professional Spark Plug Socket The letter “G” indicates a fine wire nickel alloy center electrode. £9.32. Motorcycle spark plug socket size? BMW tools make working on your BMW easier. The two most common size spark plug sockets that are essential for servicing most engines are the 5/16-inch and 13/16-inch, or if we are speaking in metrics then 13 and 20 mm sockets - as you could imagine, engineers have created different sizes of spark plugs, but these two standardized sizes will get you through most projects. “G” indicates a 10 mm x 1.0 with a 3/4″ reach. Save 44 % £11.21 INC VAT £9.34 EX VAT. The number after the – indicates the recommended spark plug gap in tenths of a millimeter. The letter “V” indicates a fine wire gold palladium center electrode. If you’re running a classic bike, you’ll probably need to set your gap and if your bike’s not running right, a gap tool can help you rule out a potential incorrect gap issue. Here is an example of the Nippon Denso basic spark plug code. There are currently two thread reaches (lengths) used: 1/2 inch  and 3/4 inch. Give us a call at 828-645-0017 between 9am – 5pm Eastern Standard Time to talk with a member of our support staff. A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium. An 8 should be gapped to .8 mm or .032″, 9 should be gapped to .9 mm or .035″, 10 should be gapped to 1.0 mm or .040″ and 11 should be gapped to 1.1 mm or .044″. There are currently three spark plug wrench sizes used on motorcycles and ATVs, 5/8 “, 18 mm and 13/16″. “W” indicates a 14 mm x 1.25 pitch size, “X” indicates a 12 mm x 1.25 size and “U” indicates a 10 mm x 1.0 size. This high-quality spark plug with a thread diameter of M10, thread pitch of 1.0mm and socket size of 16mm can fit many different models, but make sure to check the compatibility before purchase. Motorcycle spark plug socket sizes are usually 16mm, 18mm or 20.6mm (21mm will do). Resistor type spark plugs reduce the amount of radio frequency interference (rfi) that can cause ignition misfires and static on the radio, if so equipped. The second letter of the Champion spark plug code (in this case an “L”) indicates the thread size and reach of the spark plug. The Laser 1583 18mm 1/2" Drive Spark Plug Socket is perfect for working on unusually sized spark plugs that are becoming more common and a variety of motorcycles. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. Inspect your spark plug caps and replace if required. Size: 16mm single Hex (6pt) x 3/8"D. Thin wall - maximum diameter 20.8mm. The hardened chrome vanadium steel body comes complete with a rubber insert that is designed to hold the plug during installation. Every Cyclepedia subscription includes free tech support. This is normal. You need to see what size is the plug spanner for you bike. 1 decade ago. £4.40. If you don’t have a torque wrench, then get the plug hand tight and then add a ½ turn for a plug with a gasket, and more like a ¼ turn for a tapered spark plug. The letter “P” indicates a platinum center electrode. Laser 7295 Tools Thin Wall Spark Plug Socket Set 3pc 4.6 out of 5 stars 311. People often mistake to consider the most common sizes i.e., 13/16″ and 5/8″ as the standard size spark plug socket. Was £9.11 INC VAT. If there is no number at the end of the spark plug code, it should be gapped to .7 mm or .028″ unless specified differently by the vehicle manufacturer. -Spark plug wrench for all 5/8"/16mm spark plugs (the shop version). How long should a spark plug last?Motorcycle spark plugs usually last around 16,000 miles, or at least this is when most manufacturer service schedules recommend you change them. Too loose and you risk an electrical short. Online Service Manuals http://www.cyclepedia.com. A typical copper spark plug will last around 20,000 miles and most get changed at a major service (usually around 16,000 miles) but an iridium spark plug will be good for around 50,000 miles and you do see people running them to 100,000 miles with no issues. The image above shows their 100pc range, which costs around £125. If you’re going to be doing any sort of work on the bike, treat yourself to a decent set of tools. Was £19.92 INC VAT. When you buy through links on our site, we may earn an affiliate commission. From left to right the plugs are Normal, Rich, Lean and Very Lean. How do you clean motorcycle spark plugs?Just remove the plug and use a wire brush to gently brush off any deposits on the electrode. spark plug socket and torque wrench size? Silverline 571532 Box Spanner Metric Set 8-22 mm - 8 Pieces 4.2 out of 5 stars 226. The thing is that i dont know how to determine if the socket will fit both the spark plug … I have a 1980 Honda CB750 and i was wondering what the size socket i needed to take out the spark plugs? “P” indicates a 12 mm x 1.25 with a 1/2″ reach. Iridium plugs are more expensive than copper but seeing as they last longer and offer a more consistent performance throughout their lifetime, many bikes opt for an iridium ‘upgrade’. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. Relevance. The best biking experiences, discounts, tips, routes and a FREE motorcycle security eBook. “A” indicates a 12 mm x 1.25 with a 3/4″ reach. The letter “E” indicates the reach of the spark plug, that is, the length of the threads. Motorcycle Spark Plugs. Here is an example of the Champion basic spark plug code. Iridium is far harder than copper and this allows the spark plug manufacturers to create a plug with a sharper ‘tip’ which better focuses the spark around the centre electrode without compromising its service life. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. Never use a spark plug of the wrong reach. Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture, ignition timing too far advanced, excessive combustion chamber deposits. Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture. Igniting the air/fuel mixture with a spark, spark plugs play a vital role in powering your Motorcycle. Full descriptions below. Over-tightening can snap the spark plug – a nightmare. Cyclepedia.com is your online source for motorcycle repair information. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. Silverline 598422 Spark Plug Wrench, 16 mm. The letter “B” indicates two ground electrodes. This may sound simple but often the manual offers up some time-saving tips for your particular model. Causes: The causes of this can be anything from, a rich fuel mixture, too much choke, long periods of low-speed riding or idling in traffic, a blocked air filter or the plug’s heat range is too cold. It is manufactured from Chrome Vanadium for maximum durability. I have four sizes of plug on my bikes (although the old one is a bit different from most anyway as it looks big eough to fit a lorry). 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