My 96 yz 250 was does not idle and when I was riding it it Boggs out. Revving it, the top end is crisp. When I was riding it it would bog and I had the throttle wide open, then at a random time the power band would kick in and it would lift up and sound good. I lowered the clip in the needle ( thus giving it more fuel ) and it cleared up the bottom end a bit and it runs better. Any tips for jetting and needle size and position? It sounds and feels like this 250 should have more power.