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Greetings, I am at an end. I do not know what is wrong with my motorcycle. I have a 2006 RSTD with 8500 miles, and a few months ago I noticed a little backfiring when riding (mainly coming out of the right muffler.) It progressively got worse. I decided to change the plugs and noticed that the rear right cylinder plug was fouled (completely black.) I changed all the plugs, the problem persisted. In fact, after just a 20 min ride it fouled the new plug on the Right Rear Cylinder. My local dealer suggested to run some Techron through the bike, did not help. Also, there is a strong gas smell when running the bike. I checked the plugs and they are getting fire. I read on the forum that it might be my carbs, I bought a Carbtune 2 and synced the carbs (they were not even off that much.) No Change. A friend suggested to change the plug wire, but I quickly found out the plug wire is molded to the coil. I am not a mechanic, but I have done minor repair and maintenance on my bikes through the years. I am at a total loss. The owners manuel says that a black plug means a defective engine (I sure hope this is not the case.) Your help would be much appreciated. God Bless, Matt Powell My bike needs a good doctor
