Hi, I'm new to this forum, but not new to dirtbikes. I bought a 2009 KTM 450 EXC a week ago off Craigslist. It runs great, with a ton of power. It has 29 hours on it, and about 530 miles, BUT, I found out yesterday that it smokes under load out the exhaust, intermediate pipe, and the breather? hose. It doesnt smoke AT ALL WHILE IDLING, and doesnt smoke until the motor is warm. Only after 20-30 seconds of idling (when warm) when I hit the throttle. Where should I start or what can it be?? I appreciate any advice you guys can provide. Please reply with lowest cost solution first. -Dave from bony New England.