I'm getting ready to replace the spark plugs in my 2011 Multi for the first time since I bought it used, and I'm wondering if there any common pitfalls I should be aware of, or if it is as straightforward as it appears to be from the description in the shop manual (wouldn't that be refreshing for a change)? I need the remove the gas tank to route some wiring for a new GPS mount, so I figured that would be a good time to do the plugs. The service manual lists two NGK plugs;MAR9A-J / MARC9C-J, which I assume are different heat ranges. Any suggestions on which to use? Any advice greatly appreciated.