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The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber.

The letter “J” indicates a 12 mm x 1.25 size with two ground electrodes. “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. There are three spark plug thread sizes currently being used in motorcycles and ATVs. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. Here is an example of their basic spark plug code. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. Here are the most common spark plug codes by brand.

Spark plug codes tell a lot of useful information about the spark plug, however, each spark plug manufacturer uses different codes. There are currently three spark plug wrench sizes used on motorcycles and ATVs, 5/8 “, 18 mm and 13/16″.

If the reach is too long, the piston could contact the spark plug, plus carbon deposits can build up on the spark plug threads. 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. Never use a spark plug of the wrong reach. There are currently two thread reaches (lengths) used: 1/2 inch and 3/4 inch. 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. Threads | Wrenches | Parts | Codes Threads Ext Tank = Eternal Oil Tank, not Premix.Click Here for Our Article on Spark Plug Maintenance & Installation Choose an oil that is SG or higher, ie SH, SM etc, but not SD for example. JASO MA = Oil for motorcycles with wet clutches. API = American Petrol Institute, which signifies a standard. KeyWe’ve also included a few acronyms to help you. Yamaha Engine Oil Chart We’ve listed all the Yamaha motorcycles we can find, the manufacturer’s recommended engine oil and the oil capacity (minimum and maximum where possible).