According to the Yamaha Parts Catalog online you need
Yamaha Part # 94701-00333-00, SPARK PLUG
NGK Standard DR8EA #7162 Gap .024
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The oil drain plug on a Yamaha Kodiak 400 typically has a size of 12mm. It's important to use the correct size socket or wrench to avoid damaging the plug. Always refer to the owner's manual for specific torque specifications and maintenance guidelines.
Use NGK MOdel # d7ea WITH A GAP SIZE OF 0.028
When changing the spark plugs of an engine, a person should leave the right gap size. The Spark plug gap size of this engine would be .39 inches
18MM
400 cc Yamaha engine
11/16inch or 18mm socket.
The following spark plugs are specified for a 1990-1999 Yamaha RT-100: NGK B7ES (or if you want to upgrade to iridium, BR7EIX) Denso W22ES-U (for the iridium version, IW22) FYI, the spark plug gap is .022"
The Yamaha Road Star 1600 typically uses NGK CR6E or equivalent spark plugs. It's important to check your owner's manual or consult a dealer for the specific spark plug specifications, including gap size, as they can vary based on the model year and any modifications. Always ensure to use the recommended plugs for optimal performance.
Spark plug setting should be at .31
what is the spark plug gap size for a 1987 suzuki savage 650?
18 mm spark plug socket
the spark plug gap size on a Mercedes e420 is .32