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Message: [QUOTE="CaptainObvious, post: 933822, member: 17060"] rbaker, First off, hello to a fellow NJ rider! There are many things that affect jetting. At times it seems more of an art than science. Are you running the bike at high RPM's? I've noticed with 125's that they like to live in the powerband. Operations at mid throttle tend to foul the plugs easy. On the last 125 I owned I could ride for months on the same plug, but as soon as I let my buddy ride the bike, he'd foul the plug. The jetting didn't change, but he was "taking it easy" on the throttle, where I rode the bike as if the throttle was an on off switch. [/QUOTE]