My son has a new 2003 Suzuki DR 125 Dirt Bike. Its got about 10-15 hours on it. I did the oil change at 5 hours per the service manual. It is now running very rough. When idling, you can rev the engine fine, but under load it spits and sputters.... almost like it isn't getting fuel. There doesn't appear to be a fuel filter, so I was wondering if anyone had any thoughts?? Thanks
Jeff