hey guys, how are all of you, ok my prb is that i buy a new spark plug and everything is perfect, after some time my bike starts choking when i feel the kips open(i mean when the bike is at very hi revs) this doesnt let me get any speed, if i leave it alone the bike will get to a point werer i cant even ride... it chokes when warming it up and everything.. if i change the spark plug the bike is perfect and runs well, i'm putting in the NGK B8eS, all the people at the bike shops tell me its the original, what do you guys think aboput this problem... thx