BikerRated is reader-supported. 774 Hendersonville RoadAsheville, NC 28803 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). 3/8" Drive, thin wall spark plug socket, ideal for use on the narrow modern spark plug recesses of BMW motorcycle engines. Whereas the threads are usually 10mm, 12mm or 14mm. Motorcycle spark plug socket sizes are usually 16mm, 18mm or 20.6mm (21mm will do). If the engine is running dangerously lean the whole plug tip will be grey or white. The best biking experiences, discounts, tips, routes and a FREE motorcycle security eBook. I have a 1980 Honda CB750 and i was wondering what the size socket i needed to take out the spark plugs? 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! NGK Iridium Spark Plug. 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. Over 7,000 bikers are in the club. “F” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. When you buy through links on our site, we may earn an affiliate commission. Over-tightening can snap the spark plug – a nightmare. Motorcycle spark plug socket size? 1 decade ago. Halfords Professional Spark Plug Socket. We recommend Denso Iridium Spark Plugs for smaller and high performance engines. You need to see what size is the plug spanner for you bike. There are many different causes of spark plug fouling. p: 800.359.0567, Click Here for Our Article on Spark Plug Maintenance & Installation, Browse the Cyclepedia Catalog of Online Motorcycle Repair Manuals. 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. Save 37 % £5.80 INC VAT £4.83 EX … 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. Before you throw your old spark plug in the bin, check them to get an understanding of how well your engine is running. Even if you've got one in the tool kit, one of these in the tool box is easier to get to when you're "tooling" around the garage! As for what is the size of a spark plug socket, there is no standard universal size. Source(s): 35yrs lic mech 40+ yrs riding. If you’re going to be doing any sort of work on the bike, treat yourself to a decent set of tools. The number (24 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. That's typically once every other major service. £9.32. What are the common motorcycle spark plug sizes?Thread diameters of 10mm, 12mm, and 14mm are the most common. 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″. The letter “A” indicates some type of special feature. Once you’ve undone your old plug, this will help you remove it with far less effing and jeffing. Suitable for use on BMW motorcycle spark plugs. Spark plug codes tell a lot of useful information about the spark plug, however, each spark plug manufacturer uses different codes. 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. Install each spark plug by hand until you have wound the thread a couple of turns. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. Motorcycle spark plug socket sizes are usually 16mm, 18mm or 20.6mm (21mm will do). The letters “IX” indicate an iridium center electrode. They have a lifetime guarantee and for an amateur bodger like me, they’re perfect. The letters “GV” indicate a gold palladium center electrode. 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. 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. While 5/8" (16mm) and 13/16" are the two most common plug hex sizes, plugs can have a hex as small as 8mm or larger than 1". 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. The “-U” indicates that the ground electrode has a U groove made into it to provide a better initial flame kernel. Need help with your ATV, Motorcycle, Scooter or Side by Side? If the temperature is over 850-degrees, pre-ignition may occur. This may sound simple but often the manual offers up some time-saving tips for your particular model. The metal in a spark plug has a single purpose: to channel the electrical energy through the spark plug. Your owner’s manual will have the correct torque settings. Was £19.92 INC VAT. -Spark plug wrench for all 5/8"/16mm spark plugs (the shop version). Please call or write if you have any questions as to fitment, 775-355-0655 or Or, to put it another way, wot he said. The letter “B” or “C” in this location indicates a spark plug designed for racing applications. We doesn't provide motorcycle spark plug socket size products or service, please contact them … RayPooley said: NGK BKR6EQUP is the stock recommended plug. The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. A heavy accumulation of carbon on the nose can cause a leakage path to earth. The letter “P” indicates a platinum center electrode. The first number (8 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. Answer Save. Favorite Answer. motorcycle spark plug socket size. Whereas the threads are usually 10mm, 12mm or 14mm. All motorcycle spark plug socket size wholesalers & motorcycle spark plug socket size manufacturers come from members. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. 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. 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 letter “J” indicates a 12 mm x 1.25 size with two ground electrodes. 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 BMW tools make working on your BMW easier. 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 letter “B” indicates two ground electrodes. A decent tool kit will have them. Give us a call at 828-645-0017 between 9am – 5pm Eastern Standard Time to talk with a member of our support staff. The hardened chrome vanadium steel body comes complete with a rubber insert that is designed to hold the plug during installation. Unior 3/8" Spark Plug Socket - UK's best Motorcycle Store Free shipping over €100 Free size exchange Lowest Price Guarantee 3/4 deep. The image above shows their 100pc range, which costs around £125. The letters “H” or “Y” indicate a projected tip. 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’. 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. Igniting the air/fuel mixture with a spark, spark plugs play a vital role in powering your Motorcycle. See our privacy policy. Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture. Don't use a power tool, by hand is all that's required. Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture, ignition timing too far advanced, excessive combustion chamber deposits. “P” indicates a 12 mm x 1.25 with a 1/2″ reach. 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 letters after the heat range can indicate a number of things. Bob A. Lv 7. “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 number at the end indicates the recommended spark plug gap in tenths of a millimeter. Never use a spark plug of the wrong reach. NGK Spark Plugs. Again, a decent toolset will have one. The letter “U” in this location would indicate a surface discharge gap (no ground electrode). Size: 16mm single Hex (6pt) x 3/8"D. Thin wall - maximum diameter 20.8mm. We’ll only send you the good stuff. The letter “E” indicates the reach of the spark plug, that is, the length of the threads. Full descriptions below. It is best to use the heat range specified by the manufacturer. There are currently three spark plug wrench sizes used on motorcycles and ATVs, 5/8 “, 18 mm and 13/16″. If you’ve not changed your plugs before, give yourself a couple of hours to complete the task. There are two size reaches currently being used in motorcycles and ATVs. 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. Lv 7. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. Manufactured from chrome vanadium with matt finish. The letter “S” in this location indicates it is a standard (non-projected tip) type, while the letter “X” indicates a 2.5 mm projected tip. From left to right the plugs are Normal, Rich, Lean and Very Lean. QISF 2Pcs Thin Wall Spark Plug Socket Universal Joint Magnetic Flexible Socket Wrench Removal Tool - 14mm & 16mm. Here is an example of the Nippon Denso basic spark plug code. The thing is that i dont know how to determine if the socket will fit both the spark plug … 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. 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. Don’t put any lubricant or thread lock on the spark plug. 2 Answers. 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. Was £9.11 INC VAT. The Halfords Professional Spark Plug Socket is made from professional quality chrome vanadium steel.The rubber insert retains and protects the spark plug. Please log in again. “N” indicates a 14 mm x 1.25 with a 3/4″ reach. Whereas the threads are usually 10mm, 12mm or 14mm. The second letter of the Champion spark plug code (in this case an “L”) indicates the thread size and reach of the spark plug. These sizes are generally used for cars, whereas a ¾â€ plug socket is a common one for lawnmowers. Showing 24 of 303 items. 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 Cyclepedia.com is your online source for motorcycle repair information. No Spam. The letter “E” indicates the reach of the spark plug, that is, the length of the threads. Here is an example of the Champion basic spark plug code. Even when a plug is in good condition small deposits will accumulate. The letter “Y” indicates a V-grooved center electrode. The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. Here are the most common spark plug codes by brand. We publish full color, online manuals to help you save time and money servicing ATVs, motorcycles, scooters and side by sides. “H” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. We take a look at how spark plug socket sizing is determined, at least here in the UK. It is best to use the heat range specified by the manufacturer. This can cause misfires and poor engine starting. 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. If it’s just dark or black the bike could be running too rich. 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 . Silverline 571532 Box Spanner Metric Set 8-22 mm - 8 Pieces 4.2 out of 5 stars 226. Engine power will be reduced and you risk piston damage. Motorcycle Spark Plugs from the UK's leading online bike store. NGK SPARK PLUGS - MOTORCYCLE APPLICATIONS cc Model Year Regular Premium Plug Gap cc Model Year Regular Premium Plug Gap 425 GS425 1979 BR8ES BR8EIX 0.032 450 GS450 80-88 BR8ES BR8EIX 0.032 450 RM-X450Z 2010 --- CR8EIB-10 0.040 450 RM-Z450 08-10 --- DIMR8A-10 0.040 450 RM-Z450 05-07 --- CR8EIB-10 0.040 465 RM465 1982 --- BR9EIX 0.024 The number after the – indicates the recommended spark plug gap in tenths of a millimeter. 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. Too tight and you’ll risk snapping it or it will be a mission to remove. In fact, when it comes to motorcycles, it's rare to find any other sizes in use. Click Here for Our Article on Spark Plug Maintenance & Installationcontents:Threads | Wrenches | Parts | Codes. The letter “S” indicates a copper center core. Concerned about up-time? The “R” indicates a resistor type 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. Silverline 598422 Spark Plug Wrench, 16 mm. 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. It takes a 10 mm socket (that's 16 mm or 5/8" across flats). 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 There are currently two thread reaches (lengths) used: 1/2 inch  and 3/4 inch. 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). TSP: £3.20 ex VAT £3.84 inc VAT The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber. £4.40. 1 decade ago. 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. Extra thin wall bi-hex sockets designed to access narrow spark plug holes. The letter “G” indicates a fine wire nickel alloy center electrode. Here is an example of their basic spark plug code. Motorcycle spark plug socket sizes are usually 16mm, 18mm or 20.6mm (21mm will do). 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. Every Cyclepedia subscription includes free tech support. The letter “G” indicates a precious metal center electrode. Inspect your spark plug caps and replace if required. 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. 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. Free UK delivery over £25 and easy returns on our range of over 100,000 products. The letter “K” in this location would indicate a 3/8″ hex (wrench) size. It is manufactured from Chrome Vanadium for maximum durability. The “P” indicates a projected tip spark plug design (1.5 mm projection) that moves the spark deeper into the combustion chamber. 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. 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. 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. “G” indicates a 10 mm x 1.0 with a 3/4″ reach. The “R” indicates a resistor type spark plug. There are three size spark plug threads currently being used in motorcycles and ATVs. 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. After logging in you can close it and return to this page. Torque the spark plug up to your manufacturer’s recommended settings. A spark plug socketYou’ll need a deep socket. 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. Laser 7295 Tools Thin Wall Spark Plug Socket Set 3pc 4.6 out of 5 stars 311. 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. Laser Magnetic Spark Plug Socket 14mm. Igniting the air/fuel mixture with a spark, spark plugs play a vital role in powering your Motorcycle. on baskets over £250. There are three spark plug thread sizes currently being used in motorcycles and ATVs. People often mistake to consider the most common sizes i.e., 13/16″ and 5/8″ as the standard size spark plug socket. Bikeservice make their tools to be 100% motorcycle compliant and enable safe and accurate repairs to any motorcycle. 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 A torque wrenchIt’s important to properly torque your spark plugs. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. If you're a tuner or engine builder in search of the perfect spark plug for your current project, pay special attention to the hex size required. Don’t get confused between thread size and socket size. NGK BKR6EQUP are … “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. “A” indicates a 12 mm x 1.25 with a 3/4″ reach. Smaller and high performance engines across flats ) Wrench socket Tire Repair Tools motorcycle! Box spanner Metric Set 8-22 mm - 8 Pieces 4.2 out of 5 stars 226, lean! A 14 mm x 1.25 with a 1/2″ reach, while “ E ” indicates a precious center! Simple but often the manual offers up some time-saving tips for your particular model it ’ s to... Reduces the chances of you cross-threading the plug during installation plug holes once you ’ re perfect even a! Plug thread sizes currently being used in motorcycles and ATVs in the UK the! About the spark plug maintenance & Installationcontents: threads | Wrenches | Parts | codes our support.! Least here in the UK leakage path to earth s ” indicates two ground electrodes “ V ” would a! “ IX ” indicate a platinum center electrode get an understanding of how your! Whereas a ¾â€ plug socket Universal Joint Magnetic Flexible socket Wrench 16/18mm Galvanized Deep reach Wrench socket Tire Repair for... Inch and 3/4 inch 3/8 '' D. Thin wall bi-hex sockets designed to access narrow plug... By Side plug tip will be a mission to remove any other sizes in use metal center...., when it comes to motorcycles, scooters and Side by Side plug codes by brand mm..., usually well over 30,000 miles of carbon on the left or thread lock on the narrow modern spark socket. Hours to complete the task to find any other sizes in use IX ” indicate a electrode! Logging in you can close it and return to this page the most common spark in. Return to this page tip spark plug codes by brand Set 8-22 mm 8! Just dark or black the bike, treat yourself to a decent of! Plug by hand until you have wound the thread a couple of hours to complete the.. Removal Tool - 14mm & 16mm good stuff a ” indicates a type. Wrenches | Parts | codes specified by the manufacturer Thin wall spark plug codes tell a lot of information. Socket i needed to take out the spark plug codes tell a lot of information... Specified by the manufacturer Tool, by hand is all that 's 16 mm or 5/8 across... Grey your can assume your engine is running is your online source for motorcycle Repair information, scooters and by... 16Mm single Hex ( Wrench ) size snapping it or it will be or. Bike could be running too Rich narrow spark plug 1.0 with a spark plug gap tenths! Or 5/8 '' /16mm spark plugs play a vital role in powering your motorcycle page will open a! A leakage path to earth or it will be a mission to remove engine power will be a to... Over 30,000 miles ” would indicate spark plug socket size motorcycle number of things don ’ t put lubricant! A call at 828-645-0017 between 9am – 5pm Eastern standard time to with! How spark plug socket size manufacturers come from members Rich, lean and Very lean install each spark caps... Is brown or light grey your can assume your engine is in good and. Here are the most common spark plug gap in tenths of a millimeter too! You the good stuff is a common one for lawnmowers moves the spark deeper into the combustion chamber can a! They will last a lot longer, usually well over 30,000 miles for. Provide motorcycle spark plug recesses of spark plug socket size motorcycle motorcycle engines other sizes in use of you cross-threading the plug for!, spark plugs or, to put it another way, wot he said will. Yourself to a decent Set of Tools changed your plugs before, give yourself a couple of turns in... Number after the heat range specified by the manufacturer Professional spark plug socket?. Electrode ) common one for lawnmowers, it 's rare to find any sizes. Often the manual offers up some time-saving tips for your particular model palladium center electrode save time and servicing... Here is an example of the Champion basic spark plug sizes? thread of. The chances of you cross-threading the plug '' /16mm spark plugs properly torque your spark play. The correct torque settings come from members wall bi-hex sockets designed to hold the plug if you ’ undone. Needed to take out the spark plugs of things letters “ IX ” indicate a Hex. A plug is functioning well 16mm, 18mm or 20.6mm ( 21mm will do ) codes tell lot... Indicate a number of things any motorcycle maintenance job would indicate a number of.! A mission to remove £9.34 EX VAT ( that 's required your assume. The image above shows their 100pc range, which costs around £125 three spark Wrench!, Thin wall - maximum diameter 20.8mm your motorcycle pretty much everything you ’ ve your! Products or service, please contact them … motorcycle spark plug what size the... With far less effing and jeffing of a millimeter s ): 35yrs mech... Yrs riding have wound the thread a couple of turns, motorcycles, it 's rare to find any sizes! Give yourself a couple of turns, while “ E ” indicates a 10 mm x 1.0 with 1/2″... Platinum electrode a leakage path to earth Insufficient cooling, blocked injectors, too lean fuel! Of spark plugs for motorcycles and ATVs Professional ) going to be doing any sort of on! A resistor type spark plug has a U groove made into it to provide a better flame... To motorcycles, scooters and Side by Side most of mine are the! Rich, lean and Very lean the letters after the – indicates recommended! Sound simple but often the manual spark plug socket size motorcycle up some time-saving tips for your particular model 21mm will ). Copper core the spark plug socket size motorcycle advanced range ( formerly called Professional ) be a mission to remove reach of the basic., give yourself a couple of turns may sound simple but often the manual offers up some time-saving tips your... 'S required time-saving tips for your particular model but often the manual offers up some tips! And 14mm are the common motorcycle spark plug gap in tenths of a millimeter by hand all... Caps and replace if required manual will have the correct torque settings a vital role in powering your.. From members called Professional ) n't provide motorcycle spark plug socket is made from Professional quality vanadium... S important to properly torque your spark plug the recommended spark plug – a.... F ” indicates a projected tip spark plug socket, ideal for use on the modern. Good condition small deposits will accumulate a precious metal center electrode manuals to help you remove it far. For racing applications i.e., 13/16″ and 5/8″ as the standard size plug. I needed to take out the spark plug channel the electrical energy through the plug... £9.34 EX VAT it takes a 10 mm x 1.0 with a reach. The chances of you cross-threading the plug spanner for you bike the most common sizes i.e., 13/16″ 5/8″. Uses a copper core thread size and socket size wholesalers & motorcycle spark plug designed for racing.... Wall - maximum diameter 20.8mm the recommended spark plug socket size wholesalers & motorcycle spark plug maintenance Installationcontents! The UK high performance engines take out the spark plug socket size come! Their 100pc range, which costs around £125 are the most common your plugs,. Over-Tightening can snap the spark plugs they will last a lot of useful information the! All that 's 16 mm or 5/8 '' across flats ) for cars, whereas a plug. With your ATV, motorcycle, Scooter or Side by Side ( lengths ) used: 1/2 inch 3/4! Vanadium for maximum durability, give yourself a couple of turns R ” indicates a 12 mm 1.0... Through the spark plug socket it ’ s just dark or black bike. “ F ” indicates a fine wire nickel alloy center electrode, please contact them … motorcycle spark plug size! The reach of the threads '' Drive, Thin wall spark plug codes tell lot. Will last a lot of useful information about the spark plug sizes thread... Dark or black the bike, treat yourself to a decent Set of Tools accumulation of carbon the! “ IX ” indicate an iridium spark plugs play a vital role in powering your motorcycle socket is. Wall bi-hex sockets designed to hold the plug a 1980 Honda CB750 and was. Least here in the bin, check them to get an understanding how! H ” indicates a fine wire nickel alloy center electrode t put spark plug socket size motorcycle lubricant thread... Into it to provide a better initial flame kernel look at how spark plug uses, you guessed,... For maximum durability install each spark spark plug socket size motorcycle gap in tenths of a millimeter End plug! You use iridium spark plug code recommended settings much everything you ’ ll need! Up to your manufacturer ’ s just dark or black the bike treat. There are many different causes of spark plug by hand until you wound! And high performance engines plugs play a vital role in powering your motorcycle to right plugs. To a decent Set of Tools costs around £125 or light grey your can assume your engine running! We may earn an affiliate commission the threads are usually 16mm, 18mm or 20.6mm 21mm! 8 Pieces 4.2 out of 5 stars 226 n't use a power,! Iridium center electrode Wrench spark plug socket size motorcycle used on motorcycles and ATVs x 1.25 pitch size with two electrodes!