Question about 1998 Honda CBR 900 RR Fireblade
For most riders the standard (hotter CR8EH-9) spark plug is the best choice. Most cycles are set up for sea level running and on the rich side for longevity of the motor. As you move higher in elevation the thinner air makes the cycle run even richer. Vacuum carburetors and EFI systems on Honda's compensate for most of this , but a colder plug can be progressively more prone to fouling under these conditions. If warm temperature, long distance, and high speed running (combined) is your style of riding, then the colder plug (CR9EH-9) is probably a good choice for you. I do a lot of long distance riding in the heat of summer and have never felt the need of the cooler plug. I do recommend that you carry a second set of plugs in either case, just in case you foul a spark plug (I carry my old plugs that still work). The plugs you use may not be readily available unless the rare fouling of a plug just happens to be next to a Honda dealer. There is a relationship between temperature and plug heat range. If you had a sidecar and liked to drive around in 30 degrees F you might find the cycle started better with a CR7EH-9 (At 100 degrees F you would probably melt a hole in your piston with the CR7EH-9 installed).
Posted on Mar 11, 2011
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Posted on Jan 02, 2017
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