The rear plug on the ss seems to be getting very sooty and I am changing them often as a result as it starts to lose power. I am getting new jets for the Keihins and moving the needle as recommended by Ducati Kaemna after I got my Sil exhausts from them. It's also got an open air box but no other engine mods. It smells like it may be burning a little oil but there is only a tiny tiny bit of smoke. Could it be the valve seal or guide? Need to test compression too, I have an adapter for my gunson tester on the way. What you reckon?
Sooty Plugs = Too rich Oily Plugs (as opposed to wet plugs) = Rings or valve stem seals failing Wet Plugs - Far too rich White Plugs = Too weak Light grey - Rusty brown = About right Blue Smoke = Burning Oil White Smoke = Condensation Black Smoke = Too rich Backfire in airbox = Too weak (or an ignition issue) Backfire in exhaust = Too rich (or an ignition issue)
Front cylinder OK? I seem to have the same problem with my rear cylinder, it was too rich.(Wish I was!!)
Front appears light brown and a little sooty but the back is black in colour. Might have to investigate the head
Check main needle position.........you would be amazed how many people can't get both needles in the same position....... Faling that, turn pilot screw in about one turn...
