Intro
Table of Contents
BMW Spark Plug Fitment Chart
Manufacturer | Model | Standard Plug | Iridium Plug | Electrode Gap |
---|---|---|---|---|
BMW | C 400 GT | NGK LMAR8J-9E | ||
BMW | C 400 X | NGK LMAR8J-9E | ||
BMW | C 600 SPORT | NGK LMAR8D-J | ||
BMW | C 650 GT | NGK LMAR8D-J | 0.7-0.9 MM | |
BMW | C 650 GT | NGK LMAR8D-J | 0.7-0.9 MM | |
BMW | C 650 SPORT | NGK LMAR8D-J | ||
BMW | C EVOLUTION | |||
BMW | C EVOLUTION LONG RANGE | |||
BMW | C1 (125CCM) | NGK CR8EB | – | 0.8-0.9 MM |
BMW | C1 200 | NGK CR8EB | 0.8-0.9 MM | |
BMW | F 650 CS SCARVER | NGK DR8EB | NGK DR8EIX | 0.6 MM |
BMW | F 650 CS SCARVER | NGK DR8EB | NGK DR8EIX | 0.6-0.7 MM |
BMW | F 650 GS | NGK D8EA | NGK DR8EIX | 0.6 MM |
BMW | F 650 GS | NGK DR8EB | NGK DR8EIX | 0.6 MM |
BMW | F 650 GS (800CCM) | NGK DCPR8E | NGK DCPR8EIX | 0.8-0.9 MM |
BMW | F 650 GS DAKAR | NGK D8EA | NGK DR8EIX | 0.6 MM |
BMW | F 650 GS DAKAR | NGK DR8EB | NGK DR8EIX | 0.6 MM |
BMW | F 650 / ST (STRADA) | NGK D8EA | NGK DR8EIX | 0.6-0.7 MM |
BMW | F 700 GS | NGK DCPR8E | NGK DCPR8EIX | 0.8-0.9 MM |
BMW | F 700 GS (EURO 4 From 8.2016) | |||
BMW | F 750 GS (850 CCM) | NGK LMAR8J-9E | 0.7-0.9 MM | |
BMW | F 800 GS | NGK DPR8E | 0.8-0.9 MM | |
BMW | F 800 GS | NGK DCPR8E | NGK DCPR8EIX | 0.9 MM |
BMW | F 800 GS (EURO 4 From 8.2016) | |||
BMW | F 800 GS ADVENTURE | NGK DCPR8E | 0.8-0.9 MM | |
BMW | F 800 GS ADVENTURE (EURO 4) | NGK DCPR8E | NGK DCPR8EIX | |
BMW | F 800 GT | NGK DCPR8E | 0.8-0.9 MM | |
BMW | F 800 GT (EURO 4 From 11.2016) | |||
BMW | F 800 R | NGK DCPR8E | NGK DCPR8EIX | 0.9 MM |
BMW | F 800 R | NGK DCPR8E | 0.8-0.9 MM | |
BMW | F 800 R (EURO 4 From 11.2016) | NGK DCPR8E | 0.8-0.9 MM | |
BMW | F 800 S | NGK DCPR8E | NGK DCPR8EIX | 0.9 MM |
BMW | F 800 ST | NGK DCPR8E | NGK DCPR8EIX | 0.9 MM |
BMW | F 850 GS | NGK LMAR8J-9E | 0.7-0.9 MM | |
BMW | F 850 GS ADVENTURE | NGK LMAR8J-9E | 0.7-0.9 MM | |
BMW | F 900 R (EURO 5) | NGK LMAR8J-9E | ||
BMW | F 900 XR (EURO 5) | NGK LMAR8J-9E | ||
BMW | G 310 GS (EURO 4) | NGK LMAR9D-J | 1.2 ± 0.1 MM | |
BMW | G 310 R (EURO 4) | NGK LMAR9D-J | 1.2 ± 0.1 MM | |
BMW | G 450 X | NGK CR9EKB | NGK CR9EIX | 0.7 MM |
BMW | G 650 GS | NGK DR8EB | 0.6-0.7 MM | |
BMW | G 650 GS SERTAO | NGK DR8EB | 0.6-0.7 MM | |
BMW | G 650 XCHALLENGE | NGK DR8EB | NGK DR8EIX | 0.6 MM |
BMW | G 650 XCOUNTRY | NGK DR8EB | NGK DR8EIX | 0.6 MM |
BMW | G 650 XMOTO | NGK DR8EB | NGK DR8EIX | 0.6 MM |
BMW | HP2 ENDURO | Â NGK BKR7EKC | Â DCPR8EKC | |
BMW | HP2 MEGAMOTO | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | HP2 SPORT | NGK MAR9B-JDS | ||
BMW | K 1 | NGK DR7EA | – | 0.6 MM |
BMW | K 100 | NGK D7EA | NGK DR7EIX | 0.6-0.7 MM |
BMW | K 100 LT | NGK D7EA | NGK DR7EIX | 0.6 MM |
BMW | K 100 RS (4 VENTILER) | NGK D7EA | NGK DR7EIX | 0.6 MM |
BMW | K 100 RS / RT (2 VENTILER) | NGK D7EA | NGK DR7EIX | 0.6 MM |
BMW | K 1100 LT | NGK DR7EA | 0.6 MM | |
BMW | K 1100 RS | NGK DR7EA | 0.6 MM | |
BMW | K 1200 GT | NGK DCPR7E | NGK DCPR7EIX | 0.8 MM |
BMW | K 1200 GT | NGK KR9CI | 0.8 MM | |
BMW | K 1200 LT | NGK DCPR7E | NGK DCPR7EIX | 0.8 MM |
BMW | K 1200 LT | NGK DCPR7E | NGK DCPR7EIX | 0.8 MM |
BMW | K 1200 R | NGK KR9CI | 0.8 MM | |
BMW | K 1200 R SPORT | NGK KR9CI | 0.8 MM | |
BMW | K 1200 RS | NGK DCPR7E | NGK DCPR7EIX | 0.8 MM |
BMW | K 1200 RS | NGK DCPR7E | NGK DCPR7EIX | 0.8 MM |
BMW | K 1200 S | NGK KR9CI | 0.8 MM | |
BMW | K 1300 GT | NGK KR9CI | ||
BMW | K 1300 R | NGK KR9CI | ||
BMW | K 1300 S | NGK KR9CI | ||
BMW | K 1600 B BAGGER (EURO 4) | NGK LMAR8AI-8 | 0.8 MM | |
BMW | K 1600 GRAND AMERICA | NGK LMAR8AI-8 | 0.8 MM | |
BMW | K 1600 GT (EURO 4) | NGK LMAR8AI-8 | 0.8 MM | |
BMW | K 1600 GT / SPORT | NGK LMAR8AI-8 | ||
BMW | K 1600 GTL (EURO 4) | NGK LMAR8AI-8 | 08 MM | |
BMW | K 1600 GTL / EXCLUSIVE | NGK LMAR8AI-8 | 0.8 MM | |
BMW | K 75 RT / ULTIMA | NGK D7EA | NGK DR7EIX | 0.6 MM |
BMW | K 75 S | NGK D7EA | NGK DR7EIX | 0.6 MM |
BMW | K 75 / C | NGK D7EA | NGK DR7EIX | 0.6-0.7 MM |
BMW | R 100 | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 CS | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 GS | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 100 GS PARIS DAKAR | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 100 R | NGK BP6ES | NGK BPR6EIX | 0.6-0.7 MM |
BMW | R 100 R MYSTIC | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 100 RS | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 RS | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 RS | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 RS (EINARMSCHWINGE) | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 100 RT | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 RT (EINARMSCHWINGE) | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 S | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 S | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 T | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 100 / 7 | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 1100 GS | NGK BKR7EKC | NGK BKR7EIX | 0.8-0.9 MM |
BMW | R 1100 R | NGK BKR7EKC | NGK BKR7EIX | VOREINGESTELLT |
BMW | R 1100 RS | NGK BKR7EKC | NGK BKR7EIX | |
BMW | R 1100 RS | NGK BKR7EKC | NGK BKR7EIX | |
BMW | R 1100 RS-SE | NGK BKR7EKC | NGK BKR7EIX | |
BMW | R 1100 RT | NGK BKR7EKC | NGK BKR7EIX | |
BMW | R 1100 S | NGK BKR7EKC (-03) | 03-: + DCPR8EKC | VOREINGESTELLT |
BMW | R 1100 S BOXER-CUP REPLIKA | NGK BKR7EKC (-03) | 03-: + DCPR8EKC | VOREINGESTELLT |
BMW | R 1150 GS | NGK BKR7EKC | DOPPELZ. DCPR8EKC | |
BMW | R 1150 GS ADVENTURE | NGK BKR7EKC | DOPPELZ. DCPR8EKC | |
BMW | R 1150 R | NGK BKR7EKC | DOPPELZ. DCPR8EKC | |
BMW | R 1150 R ROCKSTER | Â NGK BKR7EKC | NGK DCPR8EKC | 0.8 MM |
BMW | R 1150 RS | NGK BKR7EKC | DOPPELZ. DCPR8EKC | |
BMW | R 1150 RT | NGK BKR7EKC | DOPPELZ. DCPR8EKC | |
BMW | R 1200 C | NGK BKR7EKC | NGK BKR7EIX | |
BMW | R 1200 C MONTAUK / INDEPENDENT | Â NGK BKR7EKC | NGK DCPR8EKC | |
BMW | R 1200 CL | NGK BKR7EKC (-03) | BKR7EKC+DCPR8EKC | |
BMW | R 1200 GS | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 GS | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 GS (EURO 4) | NGK LMAR8D-J | 0.7-0.9 MM | |
BMW | R 1200 GS (LC) / TRIPLE BLACK / RALLYE | NGK LMAR8D-J | 0.8 MM | |
BMW | R 1200 GS ADVENTURE | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 GS ADVENTURE | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 GS ADVENTURE | NGK MAR8B-JDS | ||
BMW | R 1200 GS ADVENTURE (EURO 4) | NGK LMAR8D-J | 0.7-0.8 MM | |
BMW | R 1200 GS ADVENTURE (LC) | NGK LMAR8D-J | 0.8 MM | |
BMW | R 1200 GS DOHC | NGK MAR8B-JDS | ||
BMW | R 1200 GS EXCLUSIVE (EURO 4) | NGK LMAR8D-J | ||
BMW | R 1200 GS RALLYE (EURO 4) | NGK LMAR8D-J | ||
BMW | R 1200 R | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 R (EURO 4) | NGK LMAR8D-J | 0.7-0.9 MM | |
BMW | R 1200 R (LC) | NGK LMAR8D-J | 0.7-0.9 MM | |
BMW | R 1200 R / CLASSIC | NGK MAR8B-JDS | ||
BMW | R 1200 RS (EURO 4) | NGK LMAR8D-J | 0.8 MM | |
BMW | R 1200 RS (LC) | NGK LMAR8D-J | 0.8 MM | |
BMW | R 1200 RT | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 RT | NGK MAR8B-JDS | ||
BMW | R 1200 RT (EURO 4) | NGK LMAR8D-J | 0.7-0.8 MM | |
BMW | R 1200 RT (LC) | NGK LMAR8D-J | 0.7-0.9 MM | |
BMW | R 1200 S | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1200 ST | NGK DCPR8EKC | NGK DCPR8EIX | |
BMW | R 1250 GS | NGK LMAR8AI-10 | 0.7-0.9 MM | |
BMW | R 1250 GS ADVENTURE | NGK LMAR8AI-10 | 0.7-0.9 MM | |
BMW | R 1250 R | NGK LMAR8AI-10 | 0.7-0.9 MM | |
BMW | R 1250 RS | NGK LMAR8AI-10 | 0.7-0.9 MM | |
BMW | R 1250 RT | NGK LMAR8AI-10 | 0.7-0.8 MM | |
BMW | R 23 | NGK B6HS | NGK BR6HIX | 0.7 MM |
BMW | R 24 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 25 | NGK B8HS | 0.6 MM | |
BMW | R 25 / 2 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 25 / 3 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 26 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 27 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 35 | NGK B6HS | 0.6 MM | |
BMW | R 45 | NGK BP7ES (35PS) | NGK BP6ES (27PS) | 0.6 MM |
BMW | R 45 | NGK BP7ES (35PS) | NGK BP6ES (27PS) | 0.6 MM |
BMW | R 50 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 50 S | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 50 / 2 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 50 / 5 | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 51 | NGK B8HS | NGK BR8HIX | |
BMW | R 51 / 2 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 51 / 3 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 60 / 2 | NGK B8HS | NGK BR8HIX | |
BMW | R 60 / 5 | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 60 / 6 | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 60 / 7 | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 65 | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 65 (EINARMSCHWINGE) | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 65 / LS | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 65 G / S | NGK BP6ES | NGK BP7ES | 0.6 MM |
BMW | R 66 | NGK B7HS | – | 0.5-0.6 MM |
BMW | R 67 / 2 / 3 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 68 | NGK B8HS | NGK BR8HIX | 0.6 MM |
BMW | R 69 S | |||
BMW | R 71 | BOSCH W175T1 | NGK B6HS | 0.6 MM |
BMW | R 75 with BEIWAGEN | BOSCH W225T1 | NGK B7HS | 0.5-0.6 MM |
BMW | R 75 / 5 | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 75 / 6 | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 75 / 7 | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 80 G / S | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 80 G / S PARIS DAKAR | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 80 GS / BASIC | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 80 R | NGK BP6ES | NGK BPR6EIX | 0.6-0.7 MM |
BMW | R 80 R MYSTIC | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R 80 RT | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 80 RT (EINARMSCHWINGE) | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 80 ST | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 80 / 7 N | NGK BP6ES | NGK BPR6EIX | 0.7 MM |
BMW | R 850 C | NGK BKR7EKC | NGK BKR7EIX | – |
BMW | R 850 GS | NGK BKR7EKC | NGK BKR7EIX | – |
BMW | R 850 R | NGK BKR7EKC | NGK BKR7EIX | |
BMW | R 850 R / COMFORT | NGK BKR7EKC | NGK BKR7EIX | – |
BMW | R 90 S | NGK BP7ES | NGK BPR7EIX | 0.6 MM |
BMW | R 90 / 6 | NGK BP6ES | NGK BPR6EIX | 0.6 MM |
BMW | R NINE T | NGK MAR8B-JDS | 0.8 MM | |
BMW | R NINE T (EURO 4) | NGK MAR8B-JDS | 0.8 MM | |
BMW | R NINE T PURE (EURO 4) | NGK MAR8B-JDS | 0.8 MM | |
BMW | R NINE T RACER (EURO 4) | NGK MAR8B-JDS | 0.8 MM | |
BMW | R NINE T SCRAMBLER (EURO 4) | NGK MAR8B-JDS | 0.8 MM | |
BMW | R NINE T URBAN G / S (EURO 4) | NGK MAR8B-JDS | 0.8 MM | |
BMW | S 1000 R | NGK LMAR9D-J | ||
BMW | S 1000 R (EURO 4) | NGK LMAR9D-J | 0.7-0.9 MM | |
BMW | S 1000 RR | NGK LMAR9D-J | 0.8 MM | |
BMW | S 1000 RR | NGK LMAR9D-J | 0.8 MM | |
BMW | S 1000 RR | NGK LMAR9FI-10G | ||
BMW | S 1000 RR | NGK LMAR9D-J | 0.8 MM | |
BMW | S 1000 RR (EURO 4) | NGK LMAR9D-J | 0.8 MM | |
BMW | S 1000 RR HP4 | NGK LMAR9D-J | 0.8 MM | |
BMW | S 1000 XR | NGK LMAR9D-J | ||
BMW | S 1000 XR (EURO 4) | NGK LMAR9D-J | ||
BMW | S 1000 XR (EURO 5) | NGK LMAR9FI-10G |
Reading your spark plug
The image of the spark plugs above shows four common conditions that you’ll find your spark plugs in. From left to right the plugs are Normal, Rich, Lean and Very Lean. Full descriptions below.
Before you throw your old spark plug in the bin, check them to get an understanding of how well your engine is running.
Normal condition
If the plug is brown or light grey your can assume your engine is in good condition and the spark plug is functioning well. Even when a plug is in good condition small deposits will accumulate. This is normal.
Rich
There are many different causes of spark plug fouling. 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. If it’s just dark or black the bike could be running too rich. A heavy accumulation of carbon on the nose can cause a leakage path to earth. This can cause misfires and poor engine starting.
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.
Lean
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.
Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture
Very Lean
If the engine is running dangerously lean the whole plug tip will be grey or white. If the temperature is over 850-degrees, pre-ignition may occur. Engine power will be reduced and you risk piston damage.
Causes: Insufficient cooling, blocked injectors, too lean a fuel mixture, ignition timing too far advanced, excessive combustion chamber deposits.
Motorcycle Spark Plug Fitting Guide + Tips
- 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.
- Install each spark plug by hand until you have wound the thread a couple of turns. This reduces the chances of you cross-threading the plug.
- Torque the spark plug up to your manufacturer’s recommended settings. 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. Over-tightening can snap the spark plug – a nightmare.
- Don’t put any lubricant or thread lock on the spark plug. Inspect your spark plug caps and replace if required.
Iridium Spark Plug vs Standard
A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium.
The metal in a spark plug has a single purpose: to channel the electrical energy through the spark plug. 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.
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.
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. 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.
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’.
Spark Plug Removal
If you’re going to be doing any sort of work on the bike, treat yourself to a decent set of tools. Most of mine are from the Halfords Advanced range (formerly called Professional).
They have a lifetime guarantee and for an amateur bodger like me, they’re perfect.
The image above shows their 100pc range, which costs around £125. 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. Pretty much everything you’ll ever need for any motorcycle maintenance job.
Motorcycle Spark Plug Removal Tools
If you’ve not changed your plugs before, give yourself a couple of hours to complete the task. Here are the essentials you need for smooth re-plugging:
Your owner’s manual
You’ll need this to help you find the location of your spark plugs and how to access them. This may sound simple but often the manual offers up some time-saving tips for your particular model.
A spark plug socket
You’ll need a deep socket. A decent tool kit will have them. Don’t get confused between thread size and socket size. Motorcycle spark plug socket sizes are usually 16mm, 18mm or 20.6mm (21mm will do). Whereas the threads are usually 10mm, 12mm or 14mm. When it comes to motorcycles, access is usually tricky, so my tip is to buy a magnetic spark plug socket like this one. Once you’ve undone your old plug, this will help you remove it with far less effing and jeffing.
A wobble socket / universal joint
You’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. Again, a decent toolset will have one.
A 3/8″ drive
You 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.
A spark plug gap gauge
This nifty little tool only costs a few quid and will help you set the correct gap for your spark plug. However, modern plugs are almost all motorcycle-specific fit and so they come ‘pre-gapped’ and you won’t need to touch them. 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.
A torque wrench
It’s important to properly torque your spark plugs. Too tight and you’ll risk snapping it or it will be a mission to remove. Too loose and you risk an electrical short. Your owner’s manual will have the correct torque settings.
Motorcycle Spark Plug FAQ
What are the common motorcycle spark plug sizes?
Thread diameters of 10mm, 12mm, and 14mm are the most common. In fact, when it comes to motorcycles, it's rare to find any other sizes in use.
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. That's typically once every other major service. However if you use Iridium spark plugs they will last a lot longer, usually well over 30,000 miles.
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. Don't use a power tool, by hand is all that's required.