I recently bought a Polaris Trail Touring 550 Fan and I'm new to Poalris. It has only 800 miles and is real clean. I've riden it for about 40 miles in one day so far mostly arounf 25 MPH. My question is; are all of these engines noisy? It makes a loud noise at idle (rap, knock, tap, whatever you call it). It's not as noticable at higher revs becasue the exhaust drowns it out. It appears to be coming from the cylinder closest to the clutch. I've checked compression 112+ (cheap gauge) in each cylinder and even. The plugs look identical and if anything a bit oily. I used about 5 gals of gas and less than half a pint of oil. I appreciate any help or guidance that anyone can give. I prefer not to tear down the top end before the end of the season all the shops around here are booked anyway. Thanks.