Carbon build up....

[Chicknstripn]

I've torn my engine apart twice. Once at 37k and then 5k mile later due to a transmission issue. At 37k I noticed both pistons had quite a lot of carbon build up, however, I figured this was just normal for a bike with 37k. The second tear down, after only 5k on a brand new motor, the amount of carbon build up got me wondering if something is wrong with my set up. In both cases the front cylinder had less then the rear.
The amount of build up after 5k was enough to almost completely cover the top of both pistons and about the thickness of a heavy construction paper.
I run only 93 octane fuel and I'll occasionally add some fuel injection cleaner or an ounce of seafoam.
Any ideas as to why I'm seeing so much carbon build up?

[TPEHAK]

Any luck with cleaning the carbon? Do the valves have carbon on them? Did your motorcycle have breather reroute before you had found too much dirt in the engine?

[Chicknstripn]

TPEHAK- this thread is 2 years old!
And I had to read it from the beginning to remember I started it!
Three things to report regarding this thread, after my second rebuild:
1) I would still like a Dean Adams full system but am unable to justify dumping any more money into my bike since it runs perfectly fine.
2) I do not have a wife band set up. Would love to make that mod but see reasoning of #1.
3) I do have a breather reroute. I've been running a very simple, very cheap, reroute for as long as I can remember on my bike. Only time I ever find anything coming from said breathers is a very small amount of oil vapor condensation when it rains or the temperature changes drastically.

No my valves never looked like yours. At the time of my 37k rebuild there was normal and minimal carbon build up on the bases of the valves. At the second rebuild there was nothing on the valves.
I've never seen crystallized carbon build up, or any for that matter, on my valve stems.

Hope this somehow helps.