motulman wrote:ok?...thats fine but it doesnt say why or that you should run a different plug in each cyl like the original topic asks

quote:
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Originally posted by motulman:
hello everyone....why would you run a different heat range plug on a water cooled engine?

I answered your quiry not the subject matter as it seems from your post you do not understand what the specific heat rating of a spark plug does.

it would make more sense to run a cooler plug (BR10ECM) in the rear and the hotter one (BR9ECM) at the front but if the engine is standard i cant see a reason not to use the manufactures recomended plug (BR9ECM in the front and rear .
I suspect the listing of the BR10ECM which Monkey says are listed on the inside of his fairing is for extreme weather conditions experienced in Japan.
As in the soutern islands (okinawa ,Kyushu area's) it is in line with the Tropics and is pretty hot all year round and is extremely hot during the summer so therefore a cooler plug would be safer.
As Japan is a very large place and the weather conditions go from one extreme to another this is why Honda have listed a couple of plugs.
On all the Hondas i have owned there is always a couple of variations on plug ratings stated in the owners manuals.
Also the reason Monkeys bike had an even hotter plug in the front is more than likely down to the fact that it is allways cold and rainy in England and is no where near as hot as it gets in Japan where the bikes are designed to be used.
It may also have had some other work carried out on the engine as each engine tuner has there own way of extracting more power from an engine this may be this particular engine tuners way of compesating for over jetting the engine.
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