I reccoment the ngk b8es. 5he b7es could burn a hole in the top of your piston over time they usually don't foul because they are a hotter plug. If you have it jetted right and don't load the bike up and don't use the engine compression to slow down you shouldn't foul plugs I sually get quite a few hours in without fouling plugs my 01 yz250 I've had for 2 years hasn't had a plug yet
wellll... it depends on how hard you ride, a br8es will work good and you will not foul it if your woods riding and stuff, but if you ride in the open and ride pretty hard, run a br9es. because the lower the number the hottter running the plug will be and if your running too hot of a plug too hard you can burn a hole in your piston. but my dad had a kx250 and he ran br9es. and that's what i run in my kx85 and kx125. hope it helps
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