06 kfx 400. (I pulled my exhaust apart, took the muffler in my building, and replaced the baffle.) The other baffle was welded on so i had to do some extra work to get it off. I pulled my exhaust apart just under the seat and as i put it back together their was an exhaust leak at the clamp. I used folded layers of aluminum foil for a quick fix to seal where male/ female ends come together internally. A big piece of aluminum foil broke off and clogged the exhaust ( internally). It stalled from the blockage at idle shortly after i started it up (2 min.). Now i cannot get the quad to start back under NO conditions. its firing, getting gas and it will barley hit. I also tried spraying either into the engine after pulling the air filter out. It just turns over and nothing. To be honest, it turns over seemingly slower than usual (battery has a charger hooked up to it.) Im am a experienced mechanic so all of the fine details has been looked over (getting fire/fuel etc....) Did i blow a head gasket or some how damage the engine internally? Thank you.