I recently changed my roadliner's spark plugs and air filter and it took more time and effort than I thought it would. My bike had 9500 miles on it so it was overdue according to the maintenance schedule. Removing the fuel tank and the tight squeeze between the frame and the cylinder heads makes the job interesting. However, after completing the job and taking a test ride, I noticed that the engine is not as "choppy" in its power delivery so I guess it was worth it. I also was able to clean some parts that I couldn't previously reach. If you guys try it, buy an 18 mm spark plug socket (weird size) and also a 1.5" (weird size) socket extension to get at that right front spark plug. Good luck. ride safe.