Okay so ive searched and cant find any answers. My problem: I have an 06 636 with 3500 miles on it. I hardly ever ride, but the other day I crank it up and immediatley notice that something sounds different, but i let it warm up anyways. The exhaust was kinda sputtering. So i let it warm to 10 minutes or so and notice as soon as I put it to gear and started pulling out of the driveway it was sputtering and no low end power. Once it made it through that point it got some power but the exhaust kinda sounds like a v-twin motor. I replaced the spark plugs thinking maybe one fouled out, but no luck. I then cleaned out the air filter too. Any ideas would be greatly appreciated.