We take a look at how spark plug socket sizing is determined, at least here in the UK. The “R” indicates a resistor type spark plug. 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. The number (24 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. Extra thin wall bi-hex sockets designed to access narrow spark plug holes. It takes a 10 mm socket (that's 16 mm or 5/8" across flats). Full descriptions below. “P” indicates a 12 mm x 1.25 with a 1/2″ reach. 0 0. guardrailjim. Spark plug codes tell a lot of useful information about the spark plug, however, each spark plug manufacturer uses different codes. 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. The hardened chrome vanadium steel body comes complete with a rubber insert that is designed to hold the plug during installation. 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. Here are the most common spark plug codes by brand. Bikeservice make their tools to be 100% motorcycle compliant and enable safe and accurate repairs to any motorcycle. 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. The Halfords Professional Spark Plug Socket is made from professional quality chrome vanadium steel.The rubber insert retains and protects the spark plug. “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. From passenger cars and bikes to Formula 1 and motorcycle racing, NGK Spark Plugs has established itself as a heavily relied upon original equipment manufacturer (OEM). Your owner’s manual will have the correct torque settings. 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″. Size: 16mm single Hex (6pt) x 3/8"D. Thin wall - maximum diameter 20.8mm. If it’s just dark or black the bike could be running too rich. “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. RayPooley said: NGK BKR6EQUP is the stock recommended plug. 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. THIN WALL SPARK PLUG SOCKET 18mm. If the plug is brown or light grey your can assume your engine is in good condition and the spark plug is functioning well. The login page will open in a new tab. This reduces the chances of you cross-threading the plug. 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. 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. Bob A. Lv 7. Motorcycle Spark Plugs. There are three size spark plug threads currently being used in motorcycles and ATVs. TSP: £3.20 ex VAT £3.84 inc VAT The letter “G” indicates a fine wire nickel alloy center electrode. NGK Iridium Spark Plug. 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. Answer Save. The letter “B” or “C” in this location indicates a spark plug designed for racing applications. Every Cyclepedia subscription includes free tech support. Igniting the air/fuel mixture with a spark, spark plugs play a vital role in powering your Motorcycle. The 8mm Laser Magnetic Spark Plug Socket with a 250mm long shaft is ideal for deep-seated spark plugs and has a magnetic socket with 3/8"D application. on baskets over £250. Too loose and you risk an electrical short. Laser Magnetic Spark Plug Socket 14mm. Give us a call at 828-645-0017 between 9am – 5pm Eastern Standard Time to talk with a member of our support staff. Save 44 % £11.21 INC VAT £9.34 EX VAT. There are three size spark plug threads and two reaches currently being used in motorcycles and ATVs. What are the common motorcycle spark plug sizes?Thread diameters of 10mm, 12mm, and 14mm are the most common. The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. The first number (8 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. “N” indicates a 14 mm x 1.25 with a 3/4″ reach. These sizes are generally used for cars, whereas a ¾â€ plug socket is a common one for lawnmowers. It is best to use the heat range specified by the manufacturer. 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 Online Service Manuals http://www.cyclepedia.com. 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. Here is an example of the Nippon Denso basic spark plug code. QISF 2Pcs Thin Wall Spark Plug Socket Universal Joint Magnetic Flexible Socket Wrench Removal Tool - 14mm & 16mm. The image above shows their 100pc range, which costs around £125. The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. NGK BKR6EQUP are … If the reach is too long, the piston could contact the spark plug, plus carbon deposits can build up on the spark plug threads. 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 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. 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″. I have a 1980 Honda CB750 and i was wondering what the size socket i needed to take out the spark plugs? The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. 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 “F” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. The letter “S” indicates a copper center core. p: 800.359.0567, Click Here for Our Article on Spark Plug Maintenance & Installation, Browse the Cyclepedia Catalog of Online Motorcycle Repair Manuals. A heavy accumulation of carbon on the nose can cause a leakage path to earth. 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. “H” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. Here is an example of the Champion basic spark plug code. The letter “P” indicates a platinum center electrode. The letter “G” indicates a precious metal center electrode. Relevance. A decent tool kit will have them. 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. 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. If the engine is running dangerously lean the whole plug tip will be grey or white. Narrow down your search by part type and part manufacturer using the menu on the left. £9.32. Manufactured from chrome vanadium with matt finish. Inspect your spark plug caps and replace if required. As for what is the size of a spark plug socket, there is no standard universal size. We publish full color, online manuals to help you save time and money servicing ATVs, motorcycles, scooters and side by sides. Torque the spark plug up to your manufacturer’s recommended settings. Engine power will be reduced and you risk piston damage. The letter “B” indicates two ground electrodes. Finance avail. The letters “IX” indicate an iridium center electrode. 1 decade ago. There are two size reaches currently being used in motorcycles and ATVs. “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. The thing is that i dont know how to determine if the socket will fit both the spark plug … Need help with your ATV, Motorcycle, Scooter or Side by Side? “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. The letter “Y” indicates a V-grooved center electrode. 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. That's typically once every other major service. Lv 7. -Spark plug wrench for all 5/8"/16mm spark plugs (the shop version). 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. Motorcycle Iridium Spark Plug For Scooter D8TC B8RTC A7TC GY6 50 60 80 100 125CC CBT125 CM125 XV250 $9.99; 10 PCS Chainsaw T Wrench Socket Spark Plug Wrench Handle Wrench Spark Plug Car Tire Welding Tire… $16.99; Adjustable Dual Hole Car Spark Plug Tester Spark Plug Detector 12V Gasoline Vehicles Spark Plug Test $56.54 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. 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. Don’t put any lubricant or thread lock on the spark plug. 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. 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. The number after the – indicates the recommended spark plug gap in tenths of a millimeter. Pair of 16-18mm(5/8-45/64'') Double Ended 150mm(5-7/8") Length Motorcycle Ignition Spark Plug Spanner Deep Reach Socket Wrench Tool with TommyBar 4.7 out of 5 stars 24 $9.49 $ 9 . Please use the motorcycle part finder below if you need help identifying suitable parts for your engine, or use the 'Enter your part number here..' search box above if you already know which part number you need. If the temperature is over 850-degrees, pre-ignition may occur. This is normal. Motorcycle spark plug socket sizes are usually 16mm, 18mm or 20.6mm (21mm will do). Whereas the threads are usually 10mm, 12mm or 14mm. We doesn't provide motorcycle spark plug socket size products or service, please contact them … If you’ve not changed your plugs before, give yourself a couple of hours to complete the task. It is manufactured from Chrome Vanadium for maximum durability. 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. A torque wrenchIt’s important to properly torque your spark plugs. 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. There are many different causes of spark plug fouling. All motorcycle spark plug socket size wholesalers & motorcycle spark plug socket size manufacturers come from members. The letter “U” in this location would indicate a surface discharge gap (no ground electrode). 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. Unior 3/8" Spark Plug Socket - UK's best Motorcycle Store Free shipping over €100 Free size exchange Lowest Price Guarantee This can cause misfires and poor engine starting. Motorcycle spark plug socket size? When you buy through links on our site, we may earn an affiliate commission. If the reach is too short, carbon deposits can build up on the threads of the spark plug hole, plus the spark will not properly ignite the air/fuel mixture. It is best to use the heat range specified by the manufacturer. Fydun Double End Spark Plug Socket Wrench 16/18mm Galvanized Deep Reach Wrench Socket Tire Repair Tools for Motorcycle Auto Repair 130mm. “A” indicates a 12 mm x 1.25 with a 3/4″ reach. Here is an example of their basic spark plug code. Laser Magnetic Spark Plug Socket 14mm Extra Info. Source(s): 35yrs lic mech 40+ yrs riding. Click Here for Our Article on Spark Plug Maintenance & Installationcontents:Threads | Wrenches | Parts | Codes. The number at the end indicates the recommended spark plug gap in tenths of a millimeter. Whereas the threads are usually 10mm, 12mm or 14mm. This may sound simple but often the manual offers up some time-saving tips for your particular model. Concerned about up-time? There are currently two thread reaches (lengths) used: 1/2 inch  and 3/4 inch. There are three spark plug thread sizes currently being used in motorcycles and ATVs. The second letter of the Champion spark plug code (in this case an “L”) indicates the thread size and reach of the spark plug. Don’t get confused between thread size and socket size. The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber. 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. 3/4 deep. The letter “A” indicates some type of special feature. 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. Most of mine are from the Halfords Advanced range (formerly called Professional). Silverline 571532 Box Spanner Metric Set 8-22 mm - 8 Pieces 4.2 out of 5 stars 226. From left to right the plugs are Normal, Rich, Lean and Very Lean. The letters “P” or “V” would indicate a platinum electrode. 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. The letter “V” indicates a fine wire gold palladium center electrode. A spark plug socketYou’ll need a deep socket. It’s a comprehensive bit of kit and includes a 1/4″, 3/8″ and 1/2″ drive, alongside plug sockets, universal joints and a wobble bar. The letter “P” indicates a platinum center electrode. £4.40. Once you’ve undone your old plug, this will help you remove it with far less effing and jeffing. 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. Showing 24 of 303 items. Sort by . However if you use Iridium spark plugs they will last a lot longer, usually well over 30,000 miles. Whereas the threads are usually 10mm, 12mm or 14mm. 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). 2 Answers. The letter “E” indicates the reach of the spark plug, that is, the length of the threads. Am attaching gg's homebrand 18mm spark plug spanner that I used "in the islands" on a little 110cc Honda put put bike. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. We recommend Denso Iridium Spark Plugs for smaller and high performance engines. Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture. A spark plug gap gaugeThis nifty little tool only costs a few quid and will help you set the correct gap for your spark plug. The letter “C” indicates a copper core. The letter “J” indicates a 12 mm x 1.25 size with two ground electrodes. Favorite Answer. When you’ve removed your spark plugs, check the condition of the threads in the cylinder head and put a cloth over the cylinder head if you’re going to leave it exposed. Over 7,000 bikers are in the club. In fact, when it comes to motorcycles, it's rare to find any other sizes in use. The letters “GV” indicate a gold palladium center electrode. spark plug socket and torque wrench size? When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. No Spam. The letter “E” indicates the reach of the spark plug, that is, the length of the threads. After logging in you can close it and return to this page. motorcycle spark plug socket size. BMW tools make working on your BMW easier. 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. Install each spark plug by hand until you have wound the thread a couple of turns. The letter “K” in this location would indicate a 3/8″ hex (wrench) size. Suitable for use on BMW motorcycle spark plugs. The “-U” indicates that the ground electrode has a U groove made into it to provide a better initial flame kernel. 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