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Motorcycle Spark Plugs

Motorcycle Spark Plugs
Photo Courtesty Nate

Motorcycle Spark Plug Information

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Welcome to the wBW Motorcycle Spark Plugs page!

This page is a compilation of interesting articles to help you choose and maintain your motorcycle spark plugs.

Got an interesting spark plug related link?  Send it to

wBW Maintenance and Repair Articles: Index of all wBW Repair and Maintenance Articles, with detailed information and photos on repairing BMW, Triumph, Moto Guzzi, and for articles on installing motorcycle LED lights, brake lights, modulators and more!

More Spark Plugs: Motorcycle Tools page includes links to all of our motorcycle tool reviews  |  Motorcycle Nuts, Bolts & Fasteners page

Spark Plug Information: Denso Spark Plug application lookup tables for motorcycles and other vehicles  |  "All About Your Engine's Spark Plugs" and many technical articles on the Century Performance website  |   Auto Expert Products sells the Colortune - a diagnostic test spark plug that lets you look into the cylinder and see the color of combustion; they also sell Gunson Gastester exhaust gas analyzers at reasonable prices

Spark Plug Cross Reference Charts: Nippondenso spark plug cross reference chart  |  NGK spark plug cross reference; an Excel file (2.0mb) that cross references NGK spark plugs with Bosch, Champion, and just about every other spark plug made

Reading Spark Plugs: Reading spark plugs by Gordon Jennings in a reprint of an old Cycle magazine article  |  Reading spark plugs in two-stroke engines with color photos  |  Reading Spark Plugs by "Snowbum" Bob Fleischer on the Airheads BMW site  |  Here's a link to an SAE paper describing iridium for spark plugs "Development of New Iridium Alloy for Spark Plug Electrodes"  |  "Spark plug colour guide and engine problem chart" on the British Classic Car website has color photos of various spark plug conditions and their related causes

Spark Plug Technology: A very nice overview of spark plugs and how they work on the NGK website  |  "How Automobile Ignition Systems Work" on the "How Things Work" website; hey, bikes have ignitions too!  |  "Look At Your Plugs" with color photos on the Triumph Spitfire (car) website  |  Bosch spark plug information page  |  Champion spark plug FAQ page

Installing Spark Plugs: Spark Plug Indexing does it matter which way your plugs are facing inside the head? Be careful doing this - you may end up with a gap between the end of the plug, the threads in the plug hole and the cylinder where carbon can accumulate and cause pre-ignition

Motorcycle Spark Plug Sources: NGK claims to have "spark plugs for virtually every Motorcycle, ATV, and Scooter application in the world" including copper and Iridium that are "specified by more motorcycle manufacturers ... than any other spark plug company"  |  E3 "Diamond Fire" dual-tip spark plugs for motorcycles "presents multiple edges to the circular edge of the center electrode, which allows the spark to naturally seek the path of least resistance", according to the company  |  Denso motorcycle spark plugs with lookup tables and cross-reference  |  Bosch makes a wide variety of spark plugs, specializing in platinum tips

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