I just bought a 2003 suzuki ltz 400. It has a rough idle and is bone stock minus someone removing the internals of the muffler. It sounds like it has a cam lope and feels like a miss at low RPM but once I get into it, it flies and doesn't miss a beat. I want to change the spark plug. I have heard mixed opinions of how, remove the gas tank or just use a swivel socket? Can you tell me exactly what tools you used and your easiest way? And maybe if there's anything else i would have to do or if it's most likely the plug for the rough idle. It has very low hours (less than 50) and I just changed the oem air filter. Thanks in advance.