My top end is apart right now. I used oven cleaner and some gentle scraping with a screw driver. My carbon was on there thick. I'm attributing most of it to the head vents venting into the intake. I'm going to route my breathers down into a catch can with a return line to retain vacuum like stock. Some guys dump it strait to the ground.
I've heard that Sea Foam makes a product that you can spray into the intake. I'm not sure how well it works but maybe if you did a session and scoped it again. If you could see any metal with the scope you are doing better than I was. I have close to 50K on my motor and aside from the carbon build up everything looks new still. The cylinders still have the ball hone marks. I think I may start using sea foam at the same time I do oil changes. I hear they make a good additive for the oil as well to clean out the motor sludge.
2011 Road Glide Ultra, Andrews 57H, VeeTwin Performance street port, Big Sucker Intake, Rhinehart 2/1 w 4" muffler, Power commander V, Paugcho 17" bars, Stock seat recovered with leather, Michelin Comander II 140/80B front, Yokohama Envigor 205/60/16 rear. It's better on the dark side.
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