i got a ngk in mine just go down to ya local motie shop and ask em for a ngk spark plug for a 125 minibike or sumthen they only cost like $6 for the cheap ones but the good as ones cost like 20 or sumthen
NGK is ok but i heard from people that they dont last ver long. I have a MSD plug in my 125cc bike and it is great. Espicially on cold days it starts first kick. They last for ages, I put one in when i first got the bike and aint touvhed it for 2 years!!!!