How often do you guys change your spark plug. I also read some found CR8 (colder plug) make the engine run better. Any ideas as to why??[/QUOTE]

I had a similar improvement when I changed to an iridium spark plug after about 4000 miles.

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XTz 660 tenere, adventure spec bash plate, main stand, skid marks tall screen, Oxford tail pack 36 litre. Kobra hand guards, Bigger cast footpegs, Zen overland luggage plate, USB power point, iridium spark plug, TKC80 f k60 R tyres, o2 and fuel Kev mods, DNA stage 2 filter. bark buster bar wieghts, Touratec side stand base and GPS mount. Led spot lights